| Message ID | 20200512155105.1068064-3-kieran.bingham+renesas@ideasonboard.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Kieran Bingham |
| Headers | show |
| Series | MAX9286 GMSL Support (+RDACM20) | expand |
Hi Kieran, On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and > CSI-2 output. The device supports multicamera streaming applications, > and features the ability to synchronise the attached cameras. > > CSI-2 output can be configured with 1 to 4 lanes, and a control channel > is supported over I2C, which implements an I2C mux to facilitate > communications with connected cameras across the reverse control > channel. > > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > > -- > v2: > - Fix MAINTAINERS entry > > This posting is released with the following modifications to work > without Sakari's VC developments: > - max9286_g_mbus_config() re-instated > - max9286_get_frame_desc() is not bus/csi aware > - max9286_{get,set}_routing() removed > > v3: > - Initialise notifier with v4l2_async_notifier_init > - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY > > v4: - Re-introduce required code to function with the VC series. > > - Implement max9286_get_routing, max9286_set_routing > - Remove max9286_g_mbus_config > > v5: (internal release) > - Fix printk formatting for hex value > - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) > - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE > - Remove 'device is bound' workaround > > v6: > - v4l2_subdev_krouting instead of v4l2_subdev_routing separated > to allow integration without the VC/V4L2-Mux series. > - convert sd_to_max9286 to inline function > - rename max9286_device to max9286_priv > - Cleanup the v4l2_async_notifier > - Extend MODULE_AUTHOR > - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id > - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) > - Use new YAML file reference in MAINTAINERS > - Parse new i2c-mux node in max9286_get_i2c_by_id > (This could/should be refactored to parse these separately first) > - Spelling and calculation fixes in the FSYNC_LOCKED check comments > - Identify each enabled i2c-mux channel in a single pass > - max9286: Improve mux-state readbility [v2] > - Fix frame sync lock durations > - Add comment to describe /why/ we must open the mux in s_stream > - use -EXDEV as return code for failed link synchronisation. > - Fix reference counting of the dt nodeS > - Convert to probe_new for I2C > - Remove redundant max9286_i2c_mux_state > - Provide optional enable-gpio (max9286-pwdn) > > v7: > [Kieran] > - Ensure powerdown lines are optional > - Add a 4ms power-up delay > - Add max9286_check_config_link() to core > - Add GPIO chip controller for GPIO0OUT and GPIO1OUT > - Fix GPIO registration > - max9286: Split out async registration > (fixes regulator -EPROBE_DEFERs failures) > - Collect all V4L2 registrations > - balance v4l2_async refcnting > - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ > > [Jacopo] > - Remove redundanct MAXIM_I2C_SPEED macros > - Move notifiers operations > - Add delay after reverse channel reconfiguration > - Move link setup to completion > - Fix up max9286_check_config_link() implementation > - Remove redundant dual configuration of reverse channel > > v8: > > [Kieran] > - Update the bound_sources mask on unbind > - Convert probe kzalloc usage to devm_ variant > - Fix up cleanup path from GPIO PowerDown registration > - cleanup GPIO device registration fail path > - Convert to use devm_regulator_get() > - Fit max9286_parse_dt print on one line > - Move multi-device workarounds out of upstream driver > - Remove I2C mod-table > - Lock format changes > - Describe pad index usage > - Remove poc_enabled workaround > - Rename the max9286_gpio to be more explicit on it's actions. > - Move max9286_init_format call > - Rework probe sequence and simplify error paths. > - Simplify i2c comments > - Implement Pixelrate control > - Disable overlap window > > [Jacopo] > - Adapt Kconfig to latest upstream changes > - Put of node on error > - Calculate pixel rate > - Simplify overlap window disablement > > v9: > > [Kieran] > - Kconfig: Depend on OF > - Re-sort addition to Makefile > --- > MAINTAINERS | 10 + > drivers/media/i2c/Kconfig | 13 + > drivers/media/i2c/Makefile | 1 + > drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ > 4 files changed, 1356 insertions(+) > create mode 100644 drivers/media/i2c/max9286.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index a7bb6e22d5da..99e3bf7760fd 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst > F: drivers/hwmon/max6697.c > F: include/linux/platform_data/max6697.h > > +MAX9286 QUAD GMSL DESERIALIZER DRIVER > +M: Jacopo Mondi <jacopo+renesas@jmondi.org> > +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > +L: linux-media@vger.kernel.org > +S: Maintained > +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml > +F: drivers/media/i2c/max9286.c > + > MAX9860 MONO AUDIO VOICE CODEC DRIVER > M: Peter Rosin <peda@axentia.se> > L: alsa-devel@alsa-project.org (moderated for non-subscribers) > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig > index 3abc80373ec0..2e390f41f6da 100644 > --- a/drivers/media/i2c/Kconfig > +++ b/drivers/media/i2c/Kconfig > @@ -464,6 +464,19 @@ config VIDEO_VPX3220 > To compile this driver as a module, choose M here: the > module will be called vpx3220. > > +config VIDEO_MAX9286 > + tristate "Maxim MAX9286 GMSL deserializer support" > + depends on I2C && I2C_MUX > + depends on OF > + select V4L2_FWNODE > + select VIDEO_V4L2_SUBDEV_API > + select MEDIA_CONTROLLER > + help > + This driver supports the Maxim MAX9286 GMSL deserializer. > + > + To compile this driver as a module, choose M here: the > + module will be called max9286. > + > comment "Video and audio decoders" > > config VIDEO_SAA717X > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile > index 77bf7d0b691f..f0b001ee4b05 100644 > --- a/drivers/media/i2c/Makefile > +++ b/drivers/media/i2c/Makefile > @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o > obj-$(CONFIG_VIDEO_IMX290) += imx290.o > obj-$(CONFIG_VIDEO_IMX319) += imx319.o > obj-$(CONFIG_VIDEO_IMX355) += imx355.o > +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o > obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o > > obj-$(CONFIG_SDR_MAX2175) += max2175.o > diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c > new file mode 100644 > index 000000000000..481d65f2b51d > --- /dev/null > +++ b/drivers/media/i2c/max9286.c > @@ -0,0 +1,1332 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Maxim MAX9286 GMSL Deserializer Driver > + * > + * Copyright (C) 2017-2019 Jacopo Mondi > + * Copyright (C) 2017-2019 Kieran Bingham > + * Copyright (C) 2017-2019 Laurent Pinchart > + * Copyright (C) 2017-2019 Niklas Söderlund > + * Copyright (C) 2016 Renesas Electronics Corporation > + * Copyright (C) 2015 Cogent Embedded, Inc. > + */ > + > +#include <linux/delay.h> > +#include <linux/device.h> > +#include <linux/fwnode.h> > +#include <linux/gpio/consumer.h> > +#include <linux/gpio/driver.h> > +#include <linux/i2c.h> > +#include <linux/i2c-mux.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/of_graph.h> > +#include <linux/regulator/consumer.h> > +#include <linux/slab.h> > + > +#include <media/v4l2-async.h> > +#include <media/v4l2-ctrls.h> > +#include <media/v4l2-device.h> > +#include <media/v4l2-fwnode.h> > +#include <media/v4l2-subdev.h> > + > +/* Register 0x00 */ > +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) > +#define MAX9286_MSTLINKSEL(n) ((n) << 5) > +#define MAX9286_EN_VS_GEN BIT(4) > +#define MAX9286_LINKEN(n) (1 << (n)) > +/* Register 0x01 */ > +#define MAX9286_FSYNCMODE_ECU (3 << 6) > +#define MAX9286_FSYNCMODE_EXT (2 << 6) > +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) > +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) > +#define MAX9286_GPIEN BIT(5) > +#define MAX9286_ENLMO_RSTFSYNC BIT(2) > +#define MAX9286_FSYNCMETH_AUTO (2 << 0) > +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) > +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) > +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 > +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 > +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 > +/* Register 0x0a */ > +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) > +#define MAX9286_REVCCEN(n) (1 << (n)) > +/* Register 0x0c */ > +#define MAX9286_HVEN BIT(7) > +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) > +#define MAX9286_EDC_6BIT_CRC (1 << 5) > +#define MAX9286_EDC_1BIT_PARITY (0 << 5) > +#define MAX9286_DESEL BIT(4) > +#define MAX9286_INVVS BIT(3) > +#define MAX9286_INVHS BIT(2) > +#define MAX9286_HVSRC_D0 (2 << 0) > +#define MAX9286_HVSRC_D14 (1 << 0) > +#define MAX9286_HVSRC_D18 (0 << 0) > +/* Register 0x0f */ > +#define MAX9286_0X0F_RESERVED BIT(3) > +/* Register 0x12 */ > +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) > +#define MAX9286_CSIDBL BIT(5) > +#define MAX9286_DBL BIT(4) > +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) > +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) > +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) > +#define MAX9286_DATATYPE_RAW14 (8 << 0) > +#define MAX9286_DATATYPE_RAW11 (7 << 0) > +#define MAX9286_DATATYPE_RAW10 (6 << 0) > +#define MAX9286_DATATYPE_RAW8 (5 << 0) > +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) > +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) > +#define MAX9286_DATATYPE_RGB555 (2 << 0) > +#define MAX9286_DATATYPE_RGB565 (1 << 0) > +#define MAX9286_DATATYPE_RGB888 (0 << 0) > +/* Register 0x15 */ > +#define MAX9286_VC(n) ((n) << 5) > +#define MAX9286_VCTYPE BIT(4) > +#define MAX9286_CSIOUTEN BIT(3) > +#define MAX9286_0X15_RESV (3 << 0) > +/* Register 0x1b */ > +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) > +#define MAX9286_ENEQ(n) (1 << (n)) > +/* Register 0x27 */ > +#define MAX9286_LOCKED BIT(7) > +/* Register 0x31 */ > +#define MAX9286_FSYNC_LOCKED BIT(6) > +/* Register 0x34 */ > +#define MAX9286_I2CLOCACK BIT(7) > +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) > +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) > +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) > +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) > +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) > +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) > +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) > +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) > +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) > +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) > +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) > +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) > +#define MAX9286_I2CSLVTO_NONE (3 << 0) > +#define MAX9286_I2CSLVTO_1024US (2 << 0) > +#define MAX9286_I2CSLVTO_256US (1 << 0) > +#define MAX9286_I2CSLVTO_64US (0 << 0) > +/* Register 0x3b */ > +#define MAX9286_REV_TRF(n) ((n) << 4) > +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ > +#define MAX9286_REV_AMP_X BIT(0) > +/* Register 0x3f */ > +#define MAX9286_EN_REV_CFG BIT(6) > +#define MAX9286_REV_FLEN(n) ((n) - 20) > +/* Register 0x49 */ > +#define MAX9286_VIDEO_DETECT_MASK 0x0f > +/* Register 0x69 */ > +#define MAX9286_LFLTBMONMASKED BIT(7) > +#define MAX9286_LOCKMONMASKED BIT(6) > +#define MAX9286_AUTOCOMBACKEN BIT(5) > +#define MAX9286_AUTOMASKEN BIT(4) > +#define MAX9286_MASKLINK(n) ((n) << 0) > + > +/* > + * The sink and source pads are created to match the OF graph port numbers so > + * that their indexes can be used interchangeably. > + */ > +#define MAX9286_NUM_GMSL 4 > +#define MAX9286_N_SINKS 4 > +#define MAX9286_N_PADS 5 > +#define MAX9286_SRC_PAD 4 > + > +struct max9286_source { > + struct v4l2_async_subdev asd; > + struct v4l2_subdev *sd; > + struct fwnode_handle *fwnode; > +}; > + > +#define asd_to_max9286_source(_asd) \ > + container_of(_asd, struct max9286_source, asd) > + > +struct max9286_priv { > + struct i2c_client *client; > + struct gpio_desc *gpiod_pwdn; > + struct v4l2_subdev sd; > + struct media_pad pads[MAX9286_N_PADS]; > + struct regulator *regulator; > + > + struct gpio_chip gpio; > + u8 gpio_state; > + > + struct i2c_mux_core *mux; > + unsigned int mux_channel; > + bool mux_open; > + > + struct v4l2_ctrl_handler ctrls; > + struct v4l2_ctrl *pixelrate; > + > + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; > + > + /* Protects controls and fmt structures */ > + struct mutex mutex; > + > + unsigned int nsources; > + unsigned int source_mask; > + unsigned int route_mask; > + unsigned int bound_sources; > + unsigned int csi2_data_lanes; > + struct max9286_source sources[MAX9286_NUM_GMSL]; > + struct v4l2_async_notifier notifier; > +}; > + > +static struct max9286_source *next_source(struct max9286_priv *priv, > + struct max9286_source *source) > +{ > + if (!source) > + source = &priv->sources[0]; > + else > + source++; > + > + for (; source < &priv->sources[MAX9286_NUM_GMSL]; source++) { > + if (source->fwnode) > + return source; > + } > + > + return NULL; > +} > + > +#define for_each_source(priv, source) \ > + for ((source) = NULL; ((source) = next_source((priv), (source))); ) > + > +#define to_index(priv, source) ((source) - &(priv)->sources[0]) > + > +static inline struct max9286_priv *sd_to_max9286(struct v4l2_subdev *sd) > +{ > + return container_of(sd, struct max9286_priv, sd); > +} > + > +/* ----------------------------------------------------------------------------- > + * I2C IO > + */ > + > +static int max9286_read(struct max9286_priv *priv, u8 reg) > +{ > + int ret; > + > + ret = i2c_smbus_read_byte_data(priv->client, reg); > + if (ret < 0) > + dev_err(&priv->client->dev, > + "%s: register 0x%02x read failed (%d)\n", > + __func__, reg, ret); > + > + return ret; > +} > + > +static int max9286_write(struct max9286_priv *priv, u8 reg, u8 val) > +{ > + int ret; > + > + ret = i2c_smbus_write_byte_data(priv->client, reg, val); > + if (ret < 0) > + dev_err(&priv->client->dev, > + "%s: register 0x%02x write failed (%d)\n", > + __func__, reg, ret); > + > + return ret; > +} > + > +/* ----------------------------------------------------------------------------- > + * I2C Multiplexer > + */ > + > +static void max9286_i2c_mux_configure(struct max9286_priv *priv, u8 conf) > +{ > + max9286_write(priv, 0x0a, conf); > + > + /* > + * We must sleep after any change to the forward or reverse channel > + * configuration. > + */ > + usleep_range(3000, 5000); > +} > + > +static void max9286_i2c_mux_open(struct max9286_priv *priv) > +{ > + /* Open all channels on the MAX9286 */ > + max9286_i2c_mux_configure(priv, 0xff); > + > + priv->mux_open = true; > +} > + > +static void max9286_i2c_mux_close(struct max9286_priv *priv) > +{ > + /* > + * Ensure that both the forward and reverse channel are disabled on the > + * mux, and that the channel ID is invalidated to ensure we reconfigure > + * on the next max9286_i2c_mux_select() call. > + */ > + max9286_i2c_mux_configure(priv, 0x00); > + > + priv->mux_open = false; > + priv->mux_channel = -1; > +} > + > +static int max9286_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan) > +{ > + struct max9286_priv *priv = i2c_mux_priv(muxc); > + > + /* Channel select is disabled when configured in the opened state. */ > + if (priv->mux_open) > + return 0; > + > + if (priv->mux_channel == chan) > + return 0; > + > + priv->mux_channel = chan; > + > + max9286_i2c_mux_configure(priv, > + MAX9286_FWDCCEN(chan) | > + MAX9286_REVCCEN(chan)); > + > + return 0; > +} > + > +static int max9286_i2c_mux_init(struct max9286_priv *priv) > +{ > + struct max9286_source *source; > + int ret; > + > + if (!i2c_check_functionality(priv->client->adapter, > + I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) > + return -ENODEV; > + > + priv->mux = i2c_mux_alloc(priv->client->adapter, &priv->client->dev, > + priv->nsources, 0, I2C_MUX_LOCKED, > + max9286_i2c_mux_select, NULL); > + if (!priv->mux) > + return -ENOMEM; > + > + priv->mux->priv = priv; > + > + for_each_source(priv, source) { > + unsigned int index = to_index(priv, source); > + > + ret = i2c_mux_add_adapter(priv->mux, 0, index, 0); > + if (ret < 0) > + goto error; > + } > + > + return 0; > + > +error: > + i2c_mux_del_adapters(priv->mux); > + return ret; > +} > + > +static void max9286_configure_i2c(struct max9286_priv *priv, bool localack) > +{ > + u8 config = MAX9286_I2CSLVSH_469NS_234NS | MAX9286_I2CSLVTO_1024US | > + MAX9286_I2CMSTBT_105KBPS; > + > + if (localack) > + config |= MAX9286_I2CLOCACK; > + > + max9286_write(priv, 0x34, config); > + usleep_range(3000, 5000); > +} > + > +/* > + * max9286_check_video_links() - Make sure video links are detected and locked > + * > + * Performs safety checks on video link status. Make sure they are detected > + * and all enabled links are locked. > + * > + * Returns 0 for success, -EIO for errors. > + */ > +static int max9286_check_video_links(struct max9286_priv *priv) > +{ > + unsigned int i; > + int ret; > + > + /* > + * Make sure valid video links are detected. > + * The delay is not characterized in de-serializer manual, wait up > + * to 5 ms. > + */ > + for (i = 0; i < 10; i++) { > + ret = max9286_read(priv, 0x49); > + if (ret < 0) > + return -EIO; > + > + if ((ret & MAX9286_VIDEO_DETECT_MASK) == priv->source_mask) > + break; > + > + usleep_range(350, 500); > + } > + > + if (i == 10) { > + dev_err(&priv->client->dev, > + "Unable to detect video links: 0x%02x\n", ret); > + return -EIO; > + } > + > + /* Make sure all enabled links are locked (4ms max). */ > + for (i = 0; i < 10; i++) { > + ret = max9286_read(priv, 0x27); > + if (ret < 0) > + return -EIO; > + > + if (ret & MAX9286_LOCKED) > + break; > + > + usleep_range(350, 450); > + } > + > + if (i == 10) { > + dev_err(&priv->client->dev, "Not all enabled links locked\n"); > + return -EIO; > + } > + > + return 0; > +} > + > +/* > + * max9286_check_config_link() - Detect and wait for configuration links > + * > + * Determine if the configuration channel is up and settled for a link. > + * > + * Returns 0 for success, -EIO for errors. > + */ > +static int max9286_check_config_link(struct max9286_priv *priv, > + unsigned int source_mask) > +{ > + unsigned int conflink_mask = (source_mask & 0x0f) << 4; > + unsigned int i; > + int ret; > + > + /* > + * Make sure requested configuration links are detected. > + * The delay is not characterized in the chip manual: wait up > + * to 5 milliseconds. > + */ > + for (i = 0; i < 10; i++) { > + ret = max9286_read(priv, 0x49) & 0xf0; > + if (ret < 0) > + return -EIO; > + > + if (ret == conflink_mask) > + break; > + > + usleep_range(350, 500); > + } > + > + if (ret != conflink_mask) { > + dev_err(&priv->client->dev, > + "Unable to detect configuration links: 0x%02x expected 0x%02x\n", > + ret, conflink_mask); > + return -EIO; > + } > + > + dev_info(&priv->client->dev, > + "Successfully detected configuration links after %u loops: 0x%02x\n", > + i, conflink_mask); > + > + return 0; > +} > + > +/* ----------------------------------------------------------------------------- > + * V4L2 Subdev > + */ > + > +static int max9286_set_pixelrate(struct max9286_priv *priv) > +{ > + struct max9286_source *source = NULL; > + u64 pixelrate = 0; > + > + for_each_source(priv, source) { > + struct v4l2_ctrl *ctrl; > + u64 source_rate = 0; > + > + /* Pixel rate is mandatory to be reported by sources. */ > + ctrl = v4l2_ctrl_find(source->sd->ctrl_handler, > + V4L2_CID_PIXEL_RATE); > + if (!ctrl) { > + pixelrate = 0; > + break; > + } > + > + /* All source must report the same pixel rate. */ > + source_rate = v4l2_ctrl_g_ctrl_int64(ctrl); > + if (!pixelrate) { > + pixelrate = source_rate; > + } else if (pixelrate != source_rate) { > + dev_err(&priv->client->dev, > + "Unable to calculate pixel rate\n"); > + return -EINVAL; > + } > + } > + > + if (!pixelrate) { > + dev_err(&priv->client->dev, > + "No pixel rate control available in sources\n"); > + return -EINVAL; > + } > + > + /* > + * The CSI-2 transmitter pixel rate is the single source rate multiplied > + * by the number of available sources. > + */ > + return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, > + pixelrate * priv->nsources); > +} > + > +static int max9286_notify_bound(struct v4l2_async_notifier *notifier, > + struct v4l2_subdev *subdev, > + struct v4l2_async_subdev *asd) > +{ > + struct max9286_priv *priv = sd_to_max9286(notifier->sd); > + struct max9286_source *source = asd_to_max9286_source(asd); > + unsigned int index = to_index(priv, source); > + unsigned int src_pad; > + int ret; > + > + ret = media_entity_get_fwnode_pad(&subdev->entity, > + source->fwnode, > + MEDIA_PAD_FL_SOURCE); > + if (ret < 0) { > + dev_err(&priv->client->dev, > + "Failed to find pad for %s\n", subdev->name); > + return ret; > + } > + > + priv->bound_sources |= BIT(index); > + source->sd = subdev; > + src_pad = ret; > + > + ret = media_create_pad_link(&source->sd->entity, src_pad, > + &priv->sd.entity, index, > + MEDIA_LNK_FL_ENABLED | > + MEDIA_LNK_FL_IMMUTABLE); > + if (ret) { > + dev_err(&priv->client->dev, > + "Unable to link %s:%u -> %s:%u\n", > + source->sd->name, src_pad, priv->sd.name, index); > + return ret; > + } > + > + dev_dbg(&priv->client->dev, "Bound %s pad: %u on index %u\n", > + subdev->name, src_pad, index); > + > + /* > + * We can only register v4l2_async_notifiers, which do not provide a > + * means to register a complete callback. bound_sources allows us to > + * identify when all remote serializers have completed their probe. > + */ > + if (priv->bound_sources != priv->source_mask) > + return 0; > + > + /* > + * All enabled sources have probed and enabled their reverse control > + * channels: > + * > + * - Verify all configuration links are properly detected > + * - Disable auto-ack as communication on the control channel are now > + * stable. > + */ > + max9286_check_config_link(priv, priv->source_mask); > + > + /* > + * Re-configure I2C with local acknowledge disabled after cameras have > + * probed. > + */ > + max9286_configure_i2c(priv, false); > + > + return max9286_set_pixelrate(priv); > +} > + > +static void max9286_notify_unbind(struct v4l2_async_notifier *notifier, > + struct v4l2_subdev *subdev, > + struct v4l2_async_subdev *asd) > +{ > + struct max9286_priv *priv = sd_to_max9286(notifier->sd); > + struct max9286_source *source = asd_to_max9286_source(asd); > + unsigned int index = to_index(priv, source); > + > + source->sd = NULL; > + priv->bound_sources &= ~BIT(index); > +} > + > +static const struct v4l2_async_notifier_operations max9286_notify_ops = { > + .bound = max9286_notify_bound, > + .unbind = max9286_notify_unbind, > +}; > + > +static int max9286_v4l2_notifier_register(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct max9286_source *source = NULL; > + int ret; > + > + if (!priv->nsources) > + return 0; > + > + v4l2_async_notifier_init(&priv->notifier); > + > + for_each_source(priv, source) { > + unsigned int i = to_index(priv, source); > + > + source->asd.match_type = V4L2_ASYNC_MATCH_FWNODE; > + source->asd.match.fwnode = source->fwnode; > + > + ret = v4l2_async_notifier_add_subdev(&priv->notifier, > + &source->asd); > + if (ret) { > + dev_err(dev, "Failed to add subdev for source %d", i); > + v4l2_async_notifier_cleanup(&priv->notifier); > + return ret; > + } > + > + /* > + * Balance the reference counting handled through > + * v4l2_async_notifier_cleanup() > + */ > + fwnode_handle_get(source->fwnode); > + } > + > + priv->notifier.ops = &max9286_notify_ops; > + > + ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier); > + if (ret) { > + dev_err(dev, "Failed to register subdev_notifier"); > + v4l2_async_notifier_cleanup(&priv->notifier); > + return ret; > + } > + > + return 0; > +} > + > +static void max9286_v4l2_notifier_unregister(struct max9286_priv *priv) > +{ > + if (!priv->nsources) > + return; > + > + v4l2_async_notifier_unregister(&priv->notifier); > + v4l2_async_notifier_cleanup(&priv->notifier); > +} > + > +static int max9286_s_stream(struct v4l2_subdev *sd, int enable) > +{ > + struct max9286_priv *priv = sd_to_max9286(sd); > + struct max9286_source *source; > + unsigned int i; > + bool sync = false; > + int ret; > + > + if (enable) { > + /* > + * The frame sync between cameras is transmitted across the > + * reverse channel as GPIO. We must open all channels while > + * streaming to allow this synchronisation signal to be shared. > + */ > + max9286_i2c_mux_open(priv); > + > + /* Start all cameras. */ > + for_each_source(priv, source) { > + ret = v4l2_subdev_call(source->sd, video, s_stream, 1); > + if (ret) > + return ret; > + } > + > + ret = max9286_check_video_links(priv); > + if (ret) > + return ret; > + > + /* > + * Wait until frame synchronization is locked. > + * > + * Manual says frame sync locking should take ~6 VTS. > + * From practical experience at least 8 are required. Give > + * 12 complete frames time (~400ms at 30 fps) to achieve frame > + * locking before returning error. > + */ > + for (i = 0; i < 40; i++) { > + if (max9286_read(priv, 0x31) & MAX9286_FSYNC_LOCKED) { > + sync = true; > + break; > + } > + usleep_range(9000, 11000); > + } > + > + if (!sync) { > + dev_err(&priv->client->dev, > + "Failed to get frame synchronization\n"); > + return -EXDEV; /* Invalid cross-device link */ > + } > + > + /* > + * Enable CSI output, VC set according to link number. > + * Bit 7 must be set (chip manual says it's 0 and reserved). > + */ > + max9286_write(priv, 0x15, 0x80 | MAX9286_VCTYPE | > + MAX9286_CSIOUTEN | MAX9286_0X15_RESV); > + } else { > + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); > + > + /* Stop all cameras. */ > + for_each_source(priv, source) > + v4l2_subdev_call(source->sd, video, s_stream, 0); > + > + max9286_i2c_mux_close(priv); > + } > + > + return 0; > +} > + > +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_mbus_code_enum *code) > +{ > + if (code->pad || code->index > 0) > + return -EINVAL; > + > + code->code = MEDIA_BUS_FMT_UYVY8_2X8; > + > + return 0; > +} > + > +static struct v4l2_mbus_framefmt * > +max9286_get_pad_format(struct max9286_priv *priv, > + struct v4l2_subdev_pad_config *cfg, > + unsigned int pad, u32 which) > +{ > + switch (which) { > + case V4L2_SUBDEV_FORMAT_TRY: > + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); > + case V4L2_SUBDEV_FORMAT_ACTIVE: > + return &priv->fmt[pad]; > + default: > + return NULL; > + } > +} > + > +static int max9286_set_fmt(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_format *format) > +{ > + struct max9286_priv *priv = sd_to_max9286(sd); > + struct v4l2_mbus_framefmt *cfg_fmt; > + > + if (format->pad >= MAX9286_SRC_PAD) > + return -EINVAL; > + > + /* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */ > + switch (format->format.code) { > + case MEDIA_BUS_FMT_UYVY8_2X8: > + case MEDIA_BUS_FMT_VYUY8_2X8: > + case MEDIA_BUS_FMT_YUYV8_2X8: > + case MEDIA_BUS_FMT_YVYU8_2X8: > + break; > + default: > + format->format.code = MEDIA_BUS_FMT_YUYV8_2X8; Is there any reason for not setting default format to MEDIA_BUS_FMT_UYVY8_2X8? Thanks, Mani > + break; > + } > + > + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); > + if (!cfg_fmt) > + return -EINVAL; > + > + mutex_lock(&priv->mutex); > + *cfg_fmt = format->format; > + mutex_unlock(&priv->mutex); > + > + return 0; > +} > + > +static int max9286_get_fmt(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_format *format) > +{ > + struct max9286_priv *priv = sd_to_max9286(sd); > + struct v4l2_mbus_framefmt *cfg_fmt; > + > + if (format->pad >= MAX9286_SRC_PAD) > + return -EINVAL; > + > + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); > + if (!cfg_fmt) > + return -EINVAL; > + > + mutex_lock(&priv->mutex); > + format->format = *cfg_fmt; > + mutex_unlock(&priv->mutex); > + > + return 0; > +} > + > +static const struct v4l2_subdev_video_ops max9286_video_ops = { > + .s_stream = max9286_s_stream, > +}; > + > +static const struct v4l2_subdev_pad_ops max9286_pad_ops = { > + .enum_mbus_code = max9286_enum_mbus_code, > + .get_fmt = max9286_get_fmt, > + .set_fmt = max9286_set_fmt, > +}; > + > +static const struct v4l2_subdev_ops max9286_subdev_ops = { > + .video = &max9286_video_ops, > + .pad = &max9286_pad_ops, > +}; > + > +static void max9286_init_format(struct v4l2_mbus_framefmt *fmt) > +{ > + fmt->width = 1280; > + fmt->height = 800; > + fmt->code = MEDIA_BUS_FMT_UYVY8_2X8; > + fmt->colorspace = V4L2_COLORSPACE_SRGB; > + fmt->field = V4L2_FIELD_NONE; > + fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; > + fmt->quantization = V4L2_QUANTIZATION_DEFAULT; > + fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT; > +} > + > +static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh) > +{ > + struct v4l2_mbus_framefmt *format; > + unsigned int i; > + > + for (i = 0; i < MAX9286_N_SINKS; i++) { > + format = v4l2_subdev_get_try_format(subdev, fh->pad, i); > + max9286_init_format(format); > + } > + > + return 0; > +} > + > +static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = { > + .open = max9286_open, > +}; > + > +static int max9286_s_ctrl(struct v4l2_ctrl *ctrl) > +{ > + switch (ctrl->id) { > + case V4L2_CID_PIXEL_RATE: > + return 0; > + default: > + return -EINVAL; > + } > +} > + > +static const struct v4l2_ctrl_ops max9286_ctrl_ops = { > + .s_ctrl = max9286_s_ctrl, > +}; > + > +static int max9286_v4l2_register(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct fwnode_handle *ep; > + int ret; > + int i; > + > + /* Register v4l2 async notifiers for connected Camera subdevices */ > + ret = max9286_v4l2_notifier_register(priv); > + if (ret) { > + dev_err(dev, "Unable to register V4L2 async notifiers\n"); > + return ret; > + } > + > + /* Configure V4L2 for the MAX9286 itself */ > + > + for (i = 0; i < MAX9286_N_SINKS; i++) > + max9286_init_format(&priv->fmt[i]); > + > + v4l2_i2c_subdev_init(&priv->sd, priv->client, &max9286_subdev_ops); > + priv->sd.internal_ops = &max9286_subdev_internal_ops; > + priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; > + > + v4l2_ctrl_handler_init(&priv->ctrls, 1); > + priv->pixelrate = v4l2_ctrl_new_std(&priv->ctrls, > + &max9286_ctrl_ops, > + V4L2_CID_PIXEL_RATE, > + 1, INT_MAX, 1, 50000000); > + > + priv->sd.ctrl_handler = &priv->ctrls; > + ret = priv->ctrls.error; > + if (ret) > + goto err_async; > + > + priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; > + > + priv->pads[MAX9286_SRC_PAD].flags = MEDIA_PAD_FL_SOURCE; > + for (i = 0; i < MAX9286_SRC_PAD; i++) > + priv->pads[i].flags = MEDIA_PAD_FL_SINK; > + ret = media_entity_pads_init(&priv->sd.entity, MAX9286_N_PADS, > + priv->pads); > + if (ret) > + goto err_async; > + > + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), MAX9286_SRC_PAD, > + 0, 0); > + if (!ep) { > + dev_err(dev, "Unable to retrieve endpoint on \"port@4\"\n"); > + ret = -ENOENT; > + goto err_async; > + } > + priv->sd.fwnode = ep; > + > + ret = v4l2_async_register_subdev(&priv->sd); > + if (ret < 0) { > + dev_err(dev, "Unable to register subdevice\n"); > + goto err_put_node; > + } > + > + return 0; > + > +err_put_node: > + fwnode_handle_put(ep); > +err_async: > + max9286_v4l2_notifier_unregister(priv); > + > + return ret; > +} > + > +static void max9286_v4l2_unregister(struct max9286_priv *priv) > +{ > + fwnode_handle_put(priv->sd.fwnode); > + v4l2_async_unregister_subdev(&priv->sd); > + max9286_v4l2_notifier_unregister(priv); > +} > + > +/* ----------------------------------------------------------------------------- > + * Probe/Remove > + */ > + > +static int max9286_setup(struct max9286_priv *priv) > +{ > + /* > + * Link ordering values for all enabled links combinations. Orders must > + * be assigned sequentially from 0 to the number of enabled links > + * without leaving any hole for disabled links. We thus assign orders to > + * enabled links first, and use the remaining order values for disabled > + * links are all links must have a different order value; > + */ > + static const u8 link_order[] = { > + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxxx */ > + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxx0 */ > + (3 << 6) | (2 << 4) | (0 << 2) | (1 << 0), /* xx0x */ > + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xx10 */ > + (3 << 6) | (0 << 4) | (2 << 2) | (1 << 0), /* x0xx */ > + (3 << 6) | (1 << 4) | (2 << 2) | (0 << 0), /* x1x0 */ > + (3 << 6) | (1 << 4) | (0 << 2) | (2 << 0), /* x10x */ > + (3 << 6) | (1 << 4) | (1 << 2) | (0 << 0), /* x210 */ > + (0 << 6) | (3 << 4) | (2 << 2) | (1 << 0), /* 0xxx */ > + (1 << 6) | (3 << 4) | (2 << 2) | (0 << 0), /* 1xx0 */ > + (1 << 6) | (3 << 4) | (0 << 2) | (2 << 0), /* 1x0x */ > + (2 << 6) | (3 << 4) | (1 << 2) | (0 << 0), /* 2x10 */ > + (1 << 6) | (0 << 4) | (3 << 2) | (2 << 0), /* 10xx */ > + (2 << 6) | (1 << 4) | (3 << 2) | (0 << 0), /* 21x0 */ > + (2 << 6) | (1 << 4) | (0 << 2) | (3 << 0), /* 210x */ > + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* 3210 */ > + }; > + > + /* > + * Set the I2C bus speed. > + * > + * Enable I2C Local Acknowledge during the probe sequences of the camera > + * only. This should be disabled after the mux is initialised. > + */ > + max9286_configure_i2c(priv, true); > + > + /* > + * Reverse channel setup. > + * > + * - Enable custom reverse channel configuration (through register 0x3f) > + * and set the first pulse length to 35 clock cycles. > + * - Increase the reverse channel amplitude to 170mV to accommodate the > + * high threshold enabled by the serializer driver. > + */ > + max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35)); > + max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) | > + MAX9286_REV_AMP_X); > + usleep_range(2000, 2500); > + > + /* > + * Enable GMSL links, mask unused ones and autodetect link > + * used as CSI clock source. > + */ > + max9286_write(priv, 0x00, MAX9286_MSTLINKSEL_AUTO | priv->route_mask); > + max9286_write(priv, 0x0b, link_order[priv->route_mask]); > + max9286_write(priv, 0x69, (0xf & ~priv->route_mask)); > + > + /* > + * Video format setup: > + * Disable CSI output, VC is set according to Link number. > + */ > + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); > + > + /* Enable CSI-2 Lane D0-D3 only, DBL mode, YUV422 8-bit. */ > + max9286_write(priv, 0x12, MAX9286_CSIDBL | MAX9286_DBL | > + MAX9286_CSILANECNT(priv->csi2_data_lanes) | > + MAX9286_DATATYPE_YUV422_8BIT); > + > + /* Automatic: FRAMESYNC taken from the slowest Link. */ > + max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ | > + MAX9286_FSYNCMETH_AUTO); > + > + /* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */ > + max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS | > + MAX9286_HVSRC_D14); > + > + /* > + * The overlap window seems to provide additional validation by tracking > + * the delay between vsync and frame sync, generating an error if the > + * delay is bigger than the programmed window, though it's not yet clear > + * what value should be set. > + * > + * As it's an optional value and can be disabled, we do so by setting > + * a 0 overlap value. > + */ > + max9286_write(priv, 0x63, 0); > + max9286_write(priv, 0x64, 0); > + > + /* > + * Wait for 2ms to allow the link to resynchronize after the > + * configuration change. > + */ > + usleep_range(2000, 5000); > + > + return 0; > +} > + > +static void max9286_gpio_set(struct gpio_chip *chip, > + unsigned int offset, int value) > +{ > + struct max9286_priv *priv = gpiochip_get_data(chip); > + > + if (value) > + priv->gpio_state |= BIT(offset); > + else > + priv->gpio_state &= ~BIT(offset); > + > + max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state); > +} > + > +static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset) > +{ > + struct max9286_priv *priv = gpiochip_get_data(chip); > + > + return priv->gpio_state & BIT(offset); > +} > + > +static int max9286_register_gpio(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct gpio_chip *gpio = &priv->gpio; > + int ret; > + > + static const char * const names[] = { > + "GPIO0OUT", > + "GPIO1OUT", > + }; > + > + /* Configure the GPIO */ > + gpio->label = dev_name(dev); > + gpio->parent = dev; > + gpio->owner = THIS_MODULE; > + gpio->of_node = dev->of_node; > + gpio->ngpio = 2; > + gpio->base = -1; > + gpio->set = max9286_gpio_set; > + gpio->get = max9286_gpio_get; > + gpio->can_sleep = true; > + gpio->names = names; > + > + /* GPIO values default to high */ > + priv->gpio_state = BIT(0) | BIT(1); > + > + ret = devm_gpiochip_add_data(dev, gpio, priv); > + if (ret) > + dev_err(dev, "Unable to create gpio_chip\n"); > + > + return ret; > +} > + > +static int max9286_init(struct device *dev) > +{ > + struct max9286_priv *priv; > + struct i2c_client *client; > + int ret; > + > + client = to_i2c_client(dev); > + priv = i2c_get_clientdata(client); > + > + /* Enable the bus power. */ > + ret = regulator_enable(priv->regulator); > + if (ret < 0) { > + dev_err(&client->dev, "Unable to turn PoC on\n"); > + return ret; > + } > + > + ret = max9286_setup(priv); > + if (ret) { > + dev_err(dev, "Unable to setup max9286\n"); > + goto err_regulator; > + } > + > + /* > + * Register all V4L2 interactions for the MAX9286 and notifiers for > + * any subdevices connected. > + */ > + ret = max9286_v4l2_register(priv); > + if (ret) { > + dev_err(dev, "Failed to register with V4L2\n"); > + goto err_regulator; > + } > + > + ret = max9286_i2c_mux_init(priv); > + if (ret) { > + dev_err(dev, "Unable to initialize I2C multiplexer\n"); > + goto err_v4l2_register; > + } > + > + /* Leave the mux channels disabled until they are selected. */ > + max9286_i2c_mux_close(priv); > + > + return 0; > + > +err_v4l2_register: > + max9286_v4l2_unregister(priv); > +err_regulator: > + regulator_disable(priv->regulator); > + > + return ret; > +} > + > +static void max9286_cleanup_dt(struct max9286_priv *priv) > +{ > + struct max9286_source *source; > + > + for_each_source(priv, source) { > + fwnode_handle_put(source->fwnode); > + source->fwnode = NULL; > + } > +} > + > +static int max9286_parse_dt(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct device_node *i2c_mux; > + struct device_node *node = NULL; > + unsigned int i2c_mux_mask = 0; > + > + of_node_get(dev->of_node); > + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > + if (!i2c_mux) { > + dev_err(dev, "Failed to find i2c-mux node\n"); > + of_node_put(dev->of_node); > + return -EINVAL; > + } > + > + /* Identify which i2c-mux channels are enabled */ > + for_each_child_of_node(i2c_mux, node) { > + u32 id = 0; > + > + of_property_read_u32(node, "reg", &id); > + if (id >= MAX9286_NUM_GMSL) > + continue; > + > + if (!of_device_is_available(node)) { > + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); > + continue; > + } > + > + i2c_mux_mask |= BIT(id); > + } > + of_node_put(node); > + of_node_put(i2c_mux); > + > + /* Parse the endpoints */ > + for_each_endpoint_of_node(dev->of_node, node) { > + struct max9286_source *source; > + struct of_endpoint ep; > + > + of_graph_parse_endpoint(node, &ep); > + dev_dbg(dev, "Endpoint %pOF on port %d", > + ep.local_node, ep.port); > + > + if (ep.port > MAX9286_NUM_GMSL) { > + dev_err(dev, "Invalid endpoint %s on port %d", > + of_node_full_name(ep.local_node), ep.port); > + continue; > + } > + > + /* For the source endpoint just parse the bus configuration. */ > + if (ep.port == MAX9286_SRC_PAD) { > + struct v4l2_fwnode_endpoint vep = { > + .bus_type = V4L2_MBUS_CSI2_DPHY > + }; > + int ret; > + > + ret = v4l2_fwnode_endpoint_parse( > + of_fwnode_handle(node), &vep); > + if (ret) { > + of_node_put(node); > + of_node_put(dev->of_node); > + return ret; > + } > + > + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { > + dev_err(dev, > + "Media bus %u type not supported\n", > + vep.bus_type); > + v4l2_fwnode_endpoint_free(&vep); > + of_node_put(node); > + of_node_put(dev->of_node); > + return -EINVAL; > + } > + > + priv->csi2_data_lanes = > + vep.bus.mipi_csi2.num_data_lanes; > + v4l2_fwnode_endpoint_free(&vep); > + > + continue; > + } > + > + /* Skip if the corresponding GMSL link is unavailable. */ > + if (!(i2c_mux_mask & BIT(ep.port))) > + continue; > + > + if (priv->sources[ep.port].fwnode) { > + dev_err(dev, > + "Multiple port endpoints are not supported: %d", > + ep.port); > + > + continue; > + } > + > + source = &priv->sources[ep.port]; > + source->fwnode = fwnode_graph_get_remote_endpoint( > + of_fwnode_handle(node)); > + if (!source->fwnode) { > + dev_err(dev, > + "Endpoint %pOF has no remote endpoint connection\n", > + ep.local_node); > + > + continue; > + } > + > + priv->source_mask |= BIT(ep.port); > + priv->nsources++; > + } > + of_node_put(node); > + of_node_put(dev->of_node); > + > + priv->route_mask = priv->source_mask; > + > + return 0; > +} > + > +static int max9286_probe(struct i2c_client *client) > +{ > + struct max9286_priv *priv; > + int ret; > + > + priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + mutex_init(&priv->mutex); > + > + priv->client = client; > + i2c_set_clientdata(client, priv); > + > + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", > + GPIOD_OUT_HIGH); > + if (IS_ERR(priv->gpiod_pwdn)) > + return PTR_ERR(priv->gpiod_pwdn); > + > + gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn"); > + gpiod_set_value_cansleep(priv->gpiod_pwdn, 1); > + > + /* Wait at least 4ms before the I2C lines latch to the address */ > + if (priv->gpiod_pwdn) > + usleep_range(4000, 5000); > + > + /* > + * The MAX9286 starts by default with all ports enabled, we disable all > + * ports early to ensure that all channels are disabled if we error out > + * and keep the bus consistent. > + */ > + max9286_i2c_mux_close(priv); > + > + /* > + * The MAX9286 initialises with auto-acknowledge enabled by default. > + * This can be invasive to other transactions on the same bus, so > + * disable it early. It will be enabled only as and when needed. > + */ > + max9286_configure_i2c(priv, false); > + > + ret = max9286_register_gpio(priv); > + if (ret) > + goto err_powerdown; > + > + priv->regulator = devm_regulator_get(&client->dev, "poc"); > + if (IS_ERR(priv->regulator)) { > + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) > + dev_err(&client->dev, > + "Unable to get PoC regulator (%ld)\n", > + PTR_ERR(priv->regulator)); > + ret = PTR_ERR(priv->regulator); > + goto err_powerdown; > + } > + > + ret = max9286_parse_dt(priv); > + if (ret) > + goto err_powerdown; > + > + ret = max9286_init(&client->dev); > + if (ret < 0) > + goto err_cleanup_dt; > + > + return 0; > + > +err_cleanup_dt: > + max9286_cleanup_dt(priv); > +err_powerdown: > + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); > + > + return ret; > +} > + > +static int max9286_remove(struct i2c_client *client) > +{ > + struct max9286_priv *priv = i2c_get_clientdata(client); > + > + i2c_mux_del_adapters(priv->mux); > + > + max9286_v4l2_unregister(priv); > + > + regulator_disable(priv->regulator); > + > + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); > + > + max9286_cleanup_dt(priv); > + > + return 0; > +} > + > +static const struct of_device_id max9286_dt_ids[] = { > + { .compatible = "maxim,max9286" }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, max9286_dt_ids); > + > +static struct i2c_driver max9286_i2c_driver = { > + .driver = { > + .name = "max9286", > + .of_match_table = of_match_ptr(max9286_dt_ids), > + }, > + .probe_new = max9286_probe, > + .remove = max9286_remove, > +}; > + > +module_i2c_driver(max9286_i2c_driver); > + > +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); > +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); > +MODULE_LICENSE("GPL"); > -- > 2.25.1 >
On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and > CSI-2 output. The device supports multicamera streaming applications, > and features the ability to synchronise the attached cameras. > > CSI-2 output can be configured with 1 to 4 lanes, and a control channel > is supported over I2C, which implements an I2C mux to facilitate > communications with connected cameras across the reverse control > channel. > > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > > -- > v2: > - Fix MAINTAINERS entry > > This posting is released with the following modifications to work > without Sakari's VC developments: > - max9286_g_mbus_config() re-instated > - max9286_get_frame_desc() is not bus/csi aware > - max9286_{get,set}_routing() removed > > v3: > - Initialise notifier with v4l2_async_notifier_init > - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY > > v4: - Re-introduce required code to function with the VC series. > > - Implement max9286_get_routing, max9286_set_routing > - Remove max9286_g_mbus_config > > v5: (internal release) > - Fix printk formatting for hex value > - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) > - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE > - Remove 'device is bound' workaround > > v6: > - v4l2_subdev_krouting instead of v4l2_subdev_routing separated > to allow integration without the VC/V4L2-Mux series. > - convert sd_to_max9286 to inline function > - rename max9286_device to max9286_priv > - Cleanup the v4l2_async_notifier > - Extend MODULE_AUTHOR > - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id > - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) > - Use new YAML file reference in MAINTAINERS > - Parse new i2c-mux node in max9286_get_i2c_by_id > (This could/should be refactored to parse these separately first) > - Spelling and calculation fixes in the FSYNC_LOCKED check comments > - Identify each enabled i2c-mux channel in a single pass > - max9286: Improve mux-state readbility [v2] > - Fix frame sync lock durations > - Add comment to describe /why/ we must open the mux in s_stream > - use -EXDEV as return code for failed link synchronisation. > - Fix reference counting of the dt nodeS > - Convert to probe_new for I2C > - Remove redundant max9286_i2c_mux_state > - Provide optional enable-gpio (max9286-pwdn) > > v7: > [Kieran] > - Ensure powerdown lines are optional > - Add a 4ms power-up delay > - Add max9286_check_config_link() to core > - Add GPIO chip controller for GPIO0OUT and GPIO1OUT > - Fix GPIO registration > - max9286: Split out async registration > (fixes regulator -EPROBE_DEFERs failures) > - Collect all V4L2 registrations > - balance v4l2_async refcnting > - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ > > [Jacopo] > - Remove redundanct MAXIM_I2C_SPEED macros > - Move notifiers operations > - Add delay after reverse channel reconfiguration > - Move link setup to completion > - Fix up max9286_check_config_link() implementation > - Remove redundant dual configuration of reverse channel > > v8: > > [Kieran] > - Update the bound_sources mask on unbind > - Convert probe kzalloc usage to devm_ variant > - Fix up cleanup path from GPIO PowerDown registration > - cleanup GPIO device registration fail path > - Convert to use devm_regulator_get() > - Fit max9286_parse_dt print on one line > - Move multi-device workarounds out of upstream driver > - Remove I2C mod-table > - Lock format changes > - Describe pad index usage > - Remove poc_enabled workaround > - Rename the max9286_gpio to be more explicit on it's actions. > - Move max9286_init_format call > - Rework probe sequence and simplify error paths. > - Simplify i2c comments > - Implement Pixelrate control > - Disable overlap window > > [Jacopo] > - Adapt Kconfig to latest upstream changes > - Put of node on error > - Calculate pixel rate > - Simplify overlap window disablement > > v9: > > [Kieran] > - Kconfig: Depend on OF > - Re-sort addition to Makefile > --- > MAINTAINERS | 10 + > drivers/media/i2c/Kconfig | 13 + > drivers/media/i2c/Makefile | 1 + > drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ > 4 files changed, 1356 insertions(+) > create mode 100644 drivers/media/i2c/max9286.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index a7bb6e22d5da..99e3bf7760fd 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst > F: drivers/hwmon/max6697.c > F: include/linux/platform_data/max6697.h > > +MAX9286 QUAD GMSL DESERIALIZER DRIVER > +M: Jacopo Mondi <jacopo+renesas@jmondi.org> > +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > +L: linux-media@vger.kernel.org > +S: Maintained > +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml > +F: drivers/media/i2c/max9286.c > + > MAX9860 MONO AUDIO VOICE CODEC DRIVER > M: Peter Rosin <peda@axentia.se> > L: alsa-devel@alsa-project.org (moderated for non-subscribers) > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig > index 3abc80373ec0..2e390f41f6da 100644 > --- a/drivers/media/i2c/Kconfig > +++ b/drivers/media/i2c/Kconfig > @@ -464,6 +464,19 @@ config VIDEO_VPX3220 > To compile this driver as a module, choose M here: the > module will be called vpx3220. > > +config VIDEO_MAX9286 > + tristate "Maxim MAX9286 GMSL deserializer support" > + depends on I2C && I2C_MUX > + depends on OF > + select V4L2_FWNODE > + select VIDEO_V4L2_SUBDEV_API > + select MEDIA_CONTROLLER > + help > + This driver supports the Maxim MAX9286 GMSL deserializer. > + > + To compile this driver as a module, choose M here: the > + module will be called max9286. > + > comment "Video and audio decoders" > > config VIDEO_SAA717X > diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile > index 77bf7d0b691f..f0b001ee4b05 100644 > --- a/drivers/media/i2c/Makefile > +++ b/drivers/media/i2c/Makefile > @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o > obj-$(CONFIG_VIDEO_IMX290) += imx290.o > obj-$(CONFIG_VIDEO_IMX319) += imx319.o > obj-$(CONFIG_VIDEO_IMX355) += imx355.o > +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o > obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o > > obj-$(CONFIG_SDR_MAX2175) += max2175.o > diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c > new file mode 100644 > index 000000000000..481d65f2b51d > --- /dev/null > +++ b/drivers/media/i2c/max9286.c > @@ -0,0 +1,1332 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Maxim MAX9286 GMSL Deserializer Driver > + * > + * Copyright (C) 2017-2019 Jacopo Mondi > + * Copyright (C) 2017-2019 Kieran Bingham > + * Copyright (C) 2017-2019 Laurent Pinchart > + * Copyright (C) 2017-2019 Niklas Söderlund > + * Copyright (C) 2016 Renesas Electronics Corporation > + * Copyright (C) 2015 Cogent Embedded, Inc. > + */ > + > +#include <linux/delay.h> > +#include <linux/device.h> > +#include <linux/fwnode.h> > +#include <linux/gpio/consumer.h> > +#include <linux/gpio/driver.h> > +#include <linux/i2c.h> > +#include <linux/i2c-mux.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/of_graph.h> > +#include <linux/regulator/consumer.h> > +#include <linux/slab.h> > + > +#include <media/v4l2-async.h> > +#include <media/v4l2-ctrls.h> > +#include <media/v4l2-device.h> > +#include <media/v4l2-fwnode.h> > +#include <media/v4l2-subdev.h> > + > +/* Register 0x00 */ > +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) > +#define MAX9286_MSTLINKSEL(n) ((n) << 5) > +#define MAX9286_EN_VS_GEN BIT(4) > +#define MAX9286_LINKEN(n) (1 << (n)) > +/* Register 0x01 */ > +#define MAX9286_FSYNCMODE_ECU (3 << 6) > +#define MAX9286_FSYNCMODE_EXT (2 << 6) > +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) > +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) > +#define MAX9286_GPIEN BIT(5) > +#define MAX9286_ENLMO_RSTFSYNC BIT(2) > +#define MAX9286_FSYNCMETH_AUTO (2 << 0) > +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) > +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) > +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 > +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 > +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 > +/* Register 0x0a */ > +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) > +#define MAX9286_REVCCEN(n) (1 << (n)) > +/* Register 0x0c */ > +#define MAX9286_HVEN BIT(7) > +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) > +#define MAX9286_EDC_6BIT_CRC (1 << 5) > +#define MAX9286_EDC_1BIT_PARITY (0 << 5) > +#define MAX9286_DESEL BIT(4) > +#define MAX9286_INVVS BIT(3) > +#define MAX9286_INVHS BIT(2) > +#define MAX9286_HVSRC_D0 (2 << 0) > +#define MAX9286_HVSRC_D14 (1 << 0) > +#define MAX9286_HVSRC_D18 (0 << 0) > +/* Register 0x0f */ > +#define MAX9286_0X0F_RESERVED BIT(3) > +/* Register 0x12 */ > +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) > +#define MAX9286_CSIDBL BIT(5) > +#define MAX9286_DBL BIT(4) > +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) > +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) > +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) > +#define MAX9286_DATATYPE_RAW14 (8 << 0) > +#define MAX9286_DATATYPE_RAW11 (7 << 0) > +#define MAX9286_DATATYPE_RAW10 (6 << 0) > +#define MAX9286_DATATYPE_RAW8 (5 << 0) > +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) > +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) > +#define MAX9286_DATATYPE_RGB555 (2 << 0) > +#define MAX9286_DATATYPE_RGB565 (1 << 0) > +#define MAX9286_DATATYPE_RGB888 (0 << 0) > +/* Register 0x15 */ > +#define MAX9286_VC(n) ((n) << 5) > +#define MAX9286_VCTYPE BIT(4) > +#define MAX9286_CSIOUTEN BIT(3) > +#define MAX9286_0X15_RESV (3 << 0) > +/* Register 0x1b */ > +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) > +#define MAX9286_ENEQ(n) (1 << (n)) > +/* Register 0x27 */ > +#define MAX9286_LOCKED BIT(7) > +/* Register 0x31 */ > +#define MAX9286_FSYNC_LOCKED BIT(6) > +/* Register 0x34 */ > +#define MAX9286_I2CLOCACK BIT(7) > +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) > +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) > +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) > +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) > +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) > +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) > +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) > +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) > +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) > +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) > +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) > +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) > +#define MAX9286_I2CSLVTO_NONE (3 << 0) > +#define MAX9286_I2CSLVTO_1024US (2 << 0) > +#define MAX9286_I2CSLVTO_256US (1 << 0) > +#define MAX9286_I2CSLVTO_64US (0 << 0) > +/* Register 0x3b */ > +#define MAX9286_REV_TRF(n) ((n) << 4) > +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ > +#define MAX9286_REV_AMP_X BIT(0) > +/* Register 0x3f */ > +#define MAX9286_EN_REV_CFG BIT(6) > +#define MAX9286_REV_FLEN(n) ((n) - 20) > +/* Register 0x49 */ > +#define MAX9286_VIDEO_DETECT_MASK 0x0f > +/* Register 0x69 */ > +#define MAX9286_LFLTBMONMASKED BIT(7) > +#define MAX9286_LOCKMONMASKED BIT(6) > +#define MAX9286_AUTOCOMBACKEN BIT(5) > +#define MAX9286_AUTOMASKEN BIT(4) > +#define MAX9286_MASKLINK(n) ((n) << 0) > + > +/* > + * The sink and source pads are created to match the OF graph port numbers so > + * that their indexes can be used interchangeably. > + */ > +#define MAX9286_NUM_GMSL 4 > +#define MAX9286_N_SINKS 4 > +#define MAX9286_N_PADS 5 > +#define MAX9286_SRC_PAD 4 > + > +struct max9286_source { > + struct v4l2_async_subdev asd; > + struct v4l2_subdev *sd; > + struct fwnode_handle *fwnode; > +}; > + > +#define asd_to_max9286_source(_asd) \ > + container_of(_asd, struct max9286_source, asd) > + > +struct max9286_priv { > + struct i2c_client *client; > + struct gpio_desc *gpiod_pwdn; > + struct v4l2_subdev sd; > + struct media_pad pads[MAX9286_N_PADS]; > + struct regulator *regulator; > + > + struct gpio_chip gpio; > + u8 gpio_state; > + > + struct i2c_mux_core *mux; > + unsigned int mux_channel; > + bool mux_open; > + > + struct v4l2_ctrl_handler ctrls; > + struct v4l2_ctrl *pixelrate; > + > + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; > + > + /* Protects controls and fmt structures */ > + struct mutex mutex; > + > + unsigned int nsources; > + unsigned int source_mask; > + unsigned int route_mask; > + unsigned int bound_sources; > + unsigned int csi2_data_lanes; > + struct max9286_source sources[MAX9286_NUM_GMSL]; > + struct v4l2_async_notifier notifier; > +}; > + [...] > +static int max9286_register_gpio(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct gpio_chip *gpio = &priv->gpio; > + int ret; > + > + static const char * const names[] = { > + "GPIO0OUT", > + "GPIO1OUT", > + }; > + > + /* Configure the GPIO */ > + gpio->label = dev_name(dev); So if you have more than one MAX9286 in a system, all gpiochips will appear with the same name. I'd recommend to append the index to distinguish properly. > + gpio->parent = dev; > + gpio->owner = THIS_MODULE; > + gpio->of_node = dev->of_node; > + gpio->ngpio = 2; > + gpio->base = -1; > + gpio->set = max9286_gpio_set; > + gpio->get = max9286_gpio_get; > + gpio->can_sleep = true; > + gpio->names = names; > + > + /* GPIO values default to high */ > + priv->gpio_state = BIT(0) | BIT(1); > + > + ret = devm_gpiochip_add_data(dev, gpio, priv); > + if (ret) > + dev_err(dev, "Unable to create gpio_chip\n"); > + > + return ret; > +} > + [...] > +static int max9286_parse_dt(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct device_node *i2c_mux; > + struct device_node *node = NULL; > + unsigned int i2c_mux_mask = 0; > + > + of_node_get(dev->of_node); Why this is needed? > + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > + if (!i2c_mux) { > + dev_err(dev, "Failed to find i2c-mux node\n"); > + of_node_put(dev->of_node); > + return -EINVAL; > + } > + > + /* Identify which i2c-mux channels are enabled */ > + for_each_child_of_node(i2c_mux, node) { > + u32 id = 0; > + > + of_property_read_u32(node, "reg", &id); > + if (id >= MAX9286_NUM_GMSL) > + continue; > + > + if (!of_device_is_available(node)) { > + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); > + continue; > + } > + > + i2c_mux_mask |= BIT(id); > + } > + of_node_put(node); > + of_node_put(i2c_mux); > + > + /* Parse the endpoints */ > + for_each_endpoint_of_node(dev->of_node, node) { > + struct max9286_source *source; > + struct of_endpoint ep; > + > + of_graph_parse_endpoint(node, &ep); > + dev_dbg(dev, "Endpoint %pOF on port %d", > + ep.local_node, ep.port); > + > + if (ep.port > MAX9286_NUM_GMSL) { > + dev_err(dev, "Invalid endpoint %s on port %d", > + of_node_full_name(ep.local_node), ep.port); > + continue; > + } > + > + /* For the source endpoint just parse the bus configuration. */ > + if (ep.port == MAX9286_SRC_PAD) { > + struct v4l2_fwnode_endpoint vep = { > + .bus_type = V4L2_MBUS_CSI2_DPHY > + }; > + int ret; > + > + ret = v4l2_fwnode_endpoint_parse( > + of_fwnode_handle(node), &vep); > + if (ret) { > + of_node_put(node); > + of_node_put(dev->of_node); > + return ret; > + } > + > + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { > + dev_err(dev, > + "Media bus %u type not supported\n", > + vep.bus_type); > + v4l2_fwnode_endpoint_free(&vep); > + of_node_put(node); > + of_node_put(dev->of_node); > + return -EINVAL; > + } > + > + priv->csi2_data_lanes = > + vep.bus.mipi_csi2.num_data_lanes; > + v4l2_fwnode_endpoint_free(&vep); > + > + continue; > + } > + > + /* Skip if the corresponding GMSL link is unavailable. */ > + if (!(i2c_mux_mask & BIT(ep.port))) > + continue; > + > + if (priv->sources[ep.port].fwnode) { > + dev_err(dev, > + "Multiple port endpoints are not supported: %d", > + ep.port); > + > + continue; > + } > + > + source = &priv->sources[ep.port]; > + source->fwnode = fwnode_graph_get_remote_endpoint( > + of_fwnode_handle(node)); > + if (!source->fwnode) { > + dev_err(dev, > + "Endpoint %pOF has no remote endpoint connection\n", > + ep.local_node); > + > + continue; > + } > + > + priv->source_mask |= BIT(ep.port); > + priv->nsources++; > + } > + of_node_put(node); > + of_node_put(dev->of_node); > + > + priv->route_mask = priv->source_mask; > + > + return 0; > +} > + [...] > +static int max9286_remove(struct i2c_client *client) > +{ > + struct max9286_priv *priv = i2c_get_clientdata(client); > + > + i2c_mux_del_adapters(priv->mux); > + > + max9286_v4l2_unregister(priv); > + > + regulator_disable(priv->regulator); > + > + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); Usual power down sequence is to pull the power down gpio low and then turn off the regulators. This helps in clearing up the internal state machine properly. Thanks, Mani > + > + max9286_cleanup_dt(priv); > + > + return 0; > +} > + > +static const struct of_device_id max9286_dt_ids[] = { > + { .compatible = "maxim,max9286" }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, max9286_dt_ids); > + > +static struct i2c_driver max9286_i2c_driver = { > + .driver = { > + .name = "max9286", > + .of_match_table = of_match_ptr(max9286_dt_ids), > + }, > + .probe_new = max9286_probe, > + .remove = max9286_remove, > +}; > + > +module_i2c_driver(max9286_i2c_driver); > + > +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); > +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); > +MODULE_LICENSE("GPL"); > -- > 2.25.1 >
Hi Mani, On 12/05/2020 18:40, Manivannan Sadhasivam wrote: > Hi Kieran, > > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: >> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and >> CSI-2 output. The device supports multicamera streaming applications, >> and features the ability to synchronise the attached cameras. >> >> CSI-2 output can be configured with 1 to 4 lanes, and a control channel >> is supported over I2C, which implements an I2C mux to facilitate >> communications with connected cameras across the reverse control >> channel. >> >> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> >> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >> >> -- >> v2: >> - Fix MAINTAINERS entry >> >> This posting is released with the following modifications to work >> without Sakari's VC developments: >> - max9286_g_mbus_config() re-instated >> - max9286_get_frame_desc() is not bus/csi aware >> - max9286_{get,set}_routing() removed >> >> v3: >> - Initialise notifier with v4l2_async_notifier_init >> - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY >> >> v4: - Re-introduce required code to function with the VC series. >> >> - Implement max9286_get_routing, max9286_set_routing >> - Remove max9286_g_mbus_config >> >> v5: (internal release) >> - Fix printk formatting for hex value >> - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) >> - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE >> - Remove 'device is bound' workaround >> >> v6: >> - v4l2_subdev_krouting instead of v4l2_subdev_routing separated >> to allow integration without the VC/V4L2-Mux series. >> - convert sd_to_max9286 to inline function >> - rename max9286_device to max9286_priv >> - Cleanup the v4l2_async_notifier >> - Extend MODULE_AUTHOR >> - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id >> - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) >> - Use new YAML file reference in MAINTAINERS >> - Parse new i2c-mux node in max9286_get_i2c_by_id >> (This could/should be refactored to parse these separately first) >> - Spelling and calculation fixes in the FSYNC_LOCKED check comments >> - Identify each enabled i2c-mux channel in a single pass >> - max9286: Improve mux-state readbility [v2] >> - Fix frame sync lock durations >> - Add comment to describe /why/ we must open the mux in s_stream >> - use -EXDEV as return code for failed link synchronisation. >> - Fix reference counting of the dt nodeS >> - Convert to probe_new for I2C >> - Remove redundant max9286_i2c_mux_state >> - Provide optional enable-gpio (max9286-pwdn) >> >> v7: >> [Kieran] >> - Ensure powerdown lines are optional >> - Add a 4ms power-up delay >> - Add max9286_check_config_link() to core >> - Add GPIO chip controller for GPIO0OUT and GPIO1OUT >> - Fix GPIO registration >> - max9286: Split out async registration >> (fixes regulator -EPROBE_DEFERs failures) >> - Collect all V4L2 registrations >> - balance v4l2_async refcnting >> - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ >> >> [Jacopo] >> - Remove redundanct MAXIM_I2C_SPEED macros >> - Move notifiers operations >> - Add delay after reverse channel reconfiguration >> - Move link setup to completion >> - Fix up max9286_check_config_link() implementation >> - Remove redundant dual configuration of reverse channel >> >> v8: >> >> [Kieran] >> - Update the bound_sources mask on unbind >> - Convert probe kzalloc usage to devm_ variant >> - Fix up cleanup path from GPIO PowerDown registration >> - cleanup GPIO device registration fail path >> - Convert to use devm_regulator_get() >> - Fit max9286_parse_dt print on one line >> - Move multi-device workarounds out of upstream driver >> - Remove I2C mod-table >> - Lock format changes >> - Describe pad index usage >> - Remove poc_enabled workaround >> - Rename the max9286_gpio to be more explicit on it's actions. >> - Move max9286_init_format call >> - Rework probe sequence and simplify error paths. >> - Simplify i2c comments >> - Implement Pixelrate control >> - Disable overlap window >> >> [Jacopo] >> - Adapt Kconfig to latest upstream changes >> - Put of node on error >> - Calculate pixel rate >> - Simplify overlap window disablement >> >> v9: >> >> [Kieran] >> - Kconfig: Depend on OF >> - Re-sort addition to Makefile >> --- >> MAINTAINERS | 10 + >> drivers/media/i2c/Kconfig | 13 + >> drivers/media/i2c/Makefile | 1 + >> drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ >> 4 files changed, 1356 insertions(+) >> create mode 100644 drivers/media/i2c/max9286.c >> >> diff --git a/MAINTAINERS b/MAINTAINERS >> index a7bb6e22d5da..99e3bf7760fd 100644 >> --- a/MAINTAINERS >> +++ b/MAINTAINERS >> @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst >> F: drivers/hwmon/max6697.c >> F: include/linux/platform_data/max6697.h >> >> +MAX9286 QUAD GMSL DESERIALIZER DRIVER >> +M: Jacopo Mondi <jacopo+renesas@jmondi.org> >> +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >> +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >> +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >> +L: linux-media@vger.kernel.org >> +S: Maintained >> +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml >> +F: drivers/media/i2c/max9286.c >> + >> MAX9860 MONO AUDIO VOICE CODEC DRIVER >> M: Peter Rosin <peda@axentia.se> >> L: alsa-devel@alsa-project.org (moderated for non-subscribers) >> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig >> index 3abc80373ec0..2e390f41f6da 100644 >> --- a/drivers/media/i2c/Kconfig >> +++ b/drivers/media/i2c/Kconfig >> @@ -464,6 +464,19 @@ config VIDEO_VPX3220 >> To compile this driver as a module, choose M here: the >> module will be called vpx3220. >> >> +config VIDEO_MAX9286 >> + tristate "Maxim MAX9286 GMSL deserializer support" >> + depends on I2C && I2C_MUX >> + depends on OF >> + select V4L2_FWNODE >> + select VIDEO_V4L2_SUBDEV_API >> + select MEDIA_CONTROLLER >> + help >> + This driver supports the Maxim MAX9286 GMSL deserializer. >> + >> + To compile this driver as a module, choose M here: the >> + module will be called max9286. >> + >> comment "Video and audio decoders" >> >> config VIDEO_SAA717X >> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile >> index 77bf7d0b691f..f0b001ee4b05 100644 >> --- a/drivers/media/i2c/Makefile >> +++ b/drivers/media/i2c/Makefile >> @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o >> obj-$(CONFIG_VIDEO_IMX290) += imx290.o >> obj-$(CONFIG_VIDEO_IMX319) += imx319.o >> obj-$(CONFIG_VIDEO_IMX355) += imx355.o >> +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o >> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o >> >> obj-$(CONFIG_SDR_MAX2175) += max2175.o >> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c >> new file mode 100644 >> index 000000000000..481d65f2b51d >> --- /dev/null >> +++ b/drivers/media/i2c/max9286.c >> @@ -0,0 +1,1332 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * Maxim MAX9286 GMSL Deserializer Driver >> + * >> + * Copyright (C) 2017-2019 Jacopo Mondi >> + * Copyright (C) 2017-2019 Kieran Bingham >> + * Copyright (C) 2017-2019 Laurent Pinchart >> + * Copyright (C) 2017-2019 Niklas Söderlund >> + * Copyright (C) 2016 Renesas Electronics Corporation >> + * Copyright (C) 2015 Cogent Embedded, Inc. >> + */ >> + >> +#include <linux/delay.h> >> +#include <linux/device.h> >> +#include <linux/fwnode.h> >> +#include <linux/gpio/consumer.h> >> +#include <linux/gpio/driver.h> >> +#include <linux/i2c.h> >> +#include <linux/i2c-mux.h> >> +#include <linux/module.h> >> +#include <linux/mutex.h> >> +#include <linux/of_graph.h> >> +#include <linux/regulator/consumer.h> >> +#include <linux/slab.h> >> + >> +#include <media/v4l2-async.h> >> +#include <media/v4l2-ctrls.h> >> +#include <media/v4l2-device.h> >> +#include <media/v4l2-fwnode.h> >> +#include <media/v4l2-subdev.h> >> + >> +/* Register 0x00 */ >> +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) >> +#define MAX9286_MSTLINKSEL(n) ((n) << 5) >> +#define MAX9286_EN_VS_GEN BIT(4) >> +#define MAX9286_LINKEN(n) (1 << (n)) >> +/* Register 0x01 */ >> +#define MAX9286_FSYNCMODE_ECU (3 << 6) >> +#define MAX9286_FSYNCMODE_EXT (2 << 6) >> +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) >> +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) >> +#define MAX9286_GPIEN BIT(5) >> +#define MAX9286_ENLMO_RSTFSYNC BIT(2) >> +#define MAX9286_FSYNCMETH_AUTO (2 << 0) >> +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) >> +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) >> +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 >> +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 >> +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 >> +/* Register 0x0a */ >> +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) >> +#define MAX9286_REVCCEN(n) (1 << (n)) >> +/* Register 0x0c */ >> +#define MAX9286_HVEN BIT(7) >> +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) >> +#define MAX9286_EDC_6BIT_CRC (1 << 5) >> +#define MAX9286_EDC_1BIT_PARITY (0 << 5) >> +#define MAX9286_DESEL BIT(4) >> +#define MAX9286_INVVS BIT(3) >> +#define MAX9286_INVHS BIT(2) >> +#define MAX9286_HVSRC_D0 (2 << 0) >> +#define MAX9286_HVSRC_D14 (1 << 0) >> +#define MAX9286_HVSRC_D18 (0 << 0) >> +/* Register 0x0f */ >> +#define MAX9286_0X0F_RESERVED BIT(3) >> +/* Register 0x12 */ >> +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) >> +#define MAX9286_CSIDBL BIT(5) >> +#define MAX9286_DBL BIT(4) >> +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) >> +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) >> +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) >> +#define MAX9286_DATATYPE_RAW14 (8 << 0) >> +#define MAX9286_DATATYPE_RAW11 (7 << 0) >> +#define MAX9286_DATATYPE_RAW10 (6 << 0) >> +#define MAX9286_DATATYPE_RAW8 (5 << 0) >> +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) >> +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) >> +#define MAX9286_DATATYPE_RGB555 (2 << 0) >> +#define MAX9286_DATATYPE_RGB565 (1 << 0) >> +#define MAX9286_DATATYPE_RGB888 (0 << 0) >> +/* Register 0x15 */ >> +#define MAX9286_VC(n) ((n) << 5) >> +#define MAX9286_VCTYPE BIT(4) >> +#define MAX9286_CSIOUTEN BIT(3) >> +#define MAX9286_0X15_RESV (3 << 0) >> +/* Register 0x1b */ >> +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) >> +#define MAX9286_ENEQ(n) (1 << (n)) >> +/* Register 0x27 */ >> +#define MAX9286_LOCKED BIT(7) >> +/* Register 0x31 */ >> +#define MAX9286_FSYNC_LOCKED BIT(6) >> +/* Register 0x34 */ >> +#define MAX9286_I2CLOCACK BIT(7) >> +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) >> +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) >> +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) >> +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) >> +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) >> +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) >> +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) >> +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) >> +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) >> +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) >> +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) >> +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) >> +#define MAX9286_I2CSLVTO_NONE (3 << 0) >> +#define MAX9286_I2CSLVTO_1024US (2 << 0) >> +#define MAX9286_I2CSLVTO_256US (1 << 0) >> +#define MAX9286_I2CSLVTO_64US (0 << 0) >> +/* Register 0x3b */ >> +#define MAX9286_REV_TRF(n) ((n) << 4) >> +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ >> +#define MAX9286_REV_AMP_X BIT(0) >> +/* Register 0x3f */ >> +#define MAX9286_EN_REV_CFG BIT(6) >> +#define MAX9286_REV_FLEN(n) ((n) - 20) >> +/* Register 0x49 */ >> +#define MAX9286_VIDEO_DETECT_MASK 0x0f >> +/* Register 0x69 */ >> +#define MAX9286_LFLTBMONMASKED BIT(7) >> +#define MAX9286_LOCKMONMASKED BIT(6) >> +#define MAX9286_AUTOCOMBACKEN BIT(5) >> +#define MAX9286_AUTOMASKEN BIT(4) >> +#define MAX9286_MASKLINK(n) ((n) << 0) >> + >> +/* >> + * The sink and source pads are created to match the OF graph port numbers so >> + * that their indexes can be used interchangeably. >> + */ >> +#define MAX9286_NUM_GMSL 4 >> +#define MAX9286_N_SINKS 4 >> +#define MAX9286_N_PADS 5 >> +#define MAX9286_SRC_PAD 4 >> + >> +struct max9286_source { >> + struct v4l2_async_subdev asd; >> + struct v4l2_subdev *sd; >> + struct fwnode_handle *fwnode; >> +}; >> + >> +#define asd_to_max9286_source(_asd) \ >> + container_of(_asd, struct max9286_source, asd) >> + >> +struct max9286_priv { >> + struct i2c_client *client; >> + struct gpio_desc *gpiod_pwdn; >> + struct v4l2_subdev sd; >> + struct media_pad pads[MAX9286_N_PADS]; >> + struct regulator *regulator; >> + >> + struct gpio_chip gpio; >> + u8 gpio_state; >> + >> + struct i2c_mux_core *mux; >> + unsigned int mux_channel; >> + bool mux_open; >> + >> + struct v4l2_ctrl_handler ctrls; >> + struct v4l2_ctrl *pixelrate; >> + >> + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; >> + >> + /* Protects controls and fmt structures */ >> + struct mutex mutex; >> + >> + unsigned int nsources; >> + unsigned int source_mask; >> + unsigned int route_mask; >> + unsigned int bound_sources; >> + unsigned int csi2_data_lanes; >> + struct max9286_source sources[MAX9286_NUM_GMSL]; >> + struct v4l2_async_notifier notifier; >> +}; >> + >> +static struct max9286_source *next_source(struct max9286_priv *priv, >> + struct max9286_source *source) >> +{ >> + if (!source) >> + source = &priv->sources[0]; >> + else >> + source++; >> + >> + for (; source < &priv->sources[MAX9286_NUM_GMSL]; source++) { >> + if (source->fwnode) >> + return source; >> + } >> + >> + return NULL; >> +} >> + >> +#define for_each_source(priv, source) \ >> + for ((source) = NULL; ((source) = next_source((priv), (source))); ) >> + >> +#define to_index(priv, source) ((source) - &(priv)->sources[0]) >> + >> +static inline struct max9286_priv *sd_to_max9286(struct v4l2_subdev *sd) >> +{ >> + return container_of(sd, struct max9286_priv, sd); >> +} >> + >> +/* ----------------------------------------------------------------------------- >> + * I2C IO >> + */ >> + >> +static int max9286_read(struct max9286_priv *priv, u8 reg) >> +{ >> + int ret; >> + >> + ret = i2c_smbus_read_byte_data(priv->client, reg); >> + if (ret < 0) >> + dev_err(&priv->client->dev, >> + "%s: register 0x%02x read failed (%d)\n", >> + __func__, reg, ret); >> + >> + return ret; >> +} >> + >> +static int max9286_write(struct max9286_priv *priv, u8 reg, u8 val) >> +{ >> + int ret; >> + >> + ret = i2c_smbus_write_byte_data(priv->client, reg, val); >> + if (ret < 0) >> + dev_err(&priv->client->dev, >> + "%s: register 0x%02x write failed (%d)\n", >> + __func__, reg, ret); >> + >> + return ret; >> +} >> + >> +/* ----------------------------------------------------------------------------- >> + * I2C Multiplexer >> + */ >> + >> +static void max9286_i2c_mux_configure(struct max9286_priv *priv, u8 conf) >> +{ >> + max9286_write(priv, 0x0a, conf); >> + >> + /* >> + * We must sleep after any change to the forward or reverse channel >> + * configuration. >> + */ >> + usleep_range(3000, 5000); >> +} >> + >> +static void max9286_i2c_mux_open(struct max9286_priv *priv) >> +{ >> + /* Open all channels on the MAX9286 */ >> + max9286_i2c_mux_configure(priv, 0xff); >> + >> + priv->mux_open = true; >> +} >> + >> +static void max9286_i2c_mux_close(struct max9286_priv *priv) >> +{ >> + /* >> + * Ensure that both the forward and reverse channel are disabled on the >> + * mux, and that the channel ID is invalidated to ensure we reconfigure >> + * on the next max9286_i2c_mux_select() call. >> + */ >> + max9286_i2c_mux_configure(priv, 0x00); >> + >> + priv->mux_open = false; >> + priv->mux_channel = -1; >> +} >> + >> +static int max9286_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan) >> +{ >> + struct max9286_priv *priv = i2c_mux_priv(muxc); >> + >> + /* Channel select is disabled when configured in the opened state. */ >> + if (priv->mux_open) >> + return 0; >> + >> + if (priv->mux_channel == chan) >> + return 0; >> + >> + priv->mux_channel = chan; >> + >> + max9286_i2c_mux_configure(priv, >> + MAX9286_FWDCCEN(chan) | >> + MAX9286_REVCCEN(chan)); >> + >> + return 0; >> +} >> + >> +static int max9286_i2c_mux_init(struct max9286_priv *priv) >> +{ >> + struct max9286_source *source; >> + int ret; >> + >> + if (!i2c_check_functionality(priv->client->adapter, >> + I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) >> + return -ENODEV; >> + >> + priv->mux = i2c_mux_alloc(priv->client->adapter, &priv->client->dev, >> + priv->nsources, 0, I2C_MUX_LOCKED, >> + max9286_i2c_mux_select, NULL); >> + if (!priv->mux) >> + return -ENOMEM; >> + >> + priv->mux->priv = priv; >> + >> + for_each_source(priv, source) { >> + unsigned int index = to_index(priv, source); >> + >> + ret = i2c_mux_add_adapter(priv->mux, 0, index, 0); >> + if (ret < 0) >> + goto error; >> + } >> + >> + return 0; >> + >> +error: >> + i2c_mux_del_adapters(priv->mux); >> + return ret; >> +} >> + >> +static void max9286_configure_i2c(struct max9286_priv *priv, bool localack) >> +{ >> + u8 config = MAX9286_I2CSLVSH_469NS_234NS | MAX9286_I2CSLVTO_1024US | >> + MAX9286_I2CMSTBT_105KBPS; >> + >> + if (localack) >> + config |= MAX9286_I2CLOCACK; >> + >> + max9286_write(priv, 0x34, config); >> + usleep_range(3000, 5000); >> +} >> + >> +/* >> + * max9286_check_video_links() - Make sure video links are detected and locked >> + * >> + * Performs safety checks on video link status. Make sure they are detected >> + * and all enabled links are locked. >> + * >> + * Returns 0 for success, -EIO for errors. >> + */ >> +static int max9286_check_video_links(struct max9286_priv *priv) >> +{ >> + unsigned int i; >> + int ret; >> + >> + /* >> + * Make sure valid video links are detected. >> + * The delay is not characterized in de-serializer manual, wait up >> + * to 5 ms. >> + */ >> + for (i = 0; i < 10; i++) { >> + ret = max9286_read(priv, 0x49); >> + if (ret < 0) >> + return -EIO; >> + >> + if ((ret & MAX9286_VIDEO_DETECT_MASK) == priv->source_mask) >> + break; >> + >> + usleep_range(350, 500); >> + } >> + >> + if (i == 10) { >> + dev_err(&priv->client->dev, >> + "Unable to detect video links: 0x%02x\n", ret); >> + return -EIO; >> + } >> + >> + /* Make sure all enabled links are locked (4ms max). */ >> + for (i = 0; i < 10; i++) { >> + ret = max9286_read(priv, 0x27); >> + if (ret < 0) >> + return -EIO; >> + >> + if (ret & MAX9286_LOCKED) >> + break; >> + >> + usleep_range(350, 450); >> + } >> + >> + if (i == 10) { >> + dev_err(&priv->client->dev, "Not all enabled links locked\n"); >> + return -EIO; >> + } >> + >> + return 0; >> +} >> + >> +/* >> + * max9286_check_config_link() - Detect and wait for configuration links >> + * >> + * Determine if the configuration channel is up and settled for a link. >> + * >> + * Returns 0 for success, -EIO for errors. >> + */ >> +static int max9286_check_config_link(struct max9286_priv *priv, >> + unsigned int source_mask) >> +{ >> + unsigned int conflink_mask = (source_mask & 0x0f) << 4; >> + unsigned int i; >> + int ret; >> + >> + /* >> + * Make sure requested configuration links are detected. >> + * The delay is not characterized in the chip manual: wait up >> + * to 5 milliseconds. >> + */ >> + for (i = 0; i < 10; i++) { >> + ret = max9286_read(priv, 0x49) & 0xf0; >> + if (ret < 0) >> + return -EIO; >> + >> + if (ret == conflink_mask) >> + break; >> + >> + usleep_range(350, 500); >> + } >> + >> + if (ret != conflink_mask) { >> + dev_err(&priv->client->dev, >> + "Unable to detect configuration links: 0x%02x expected 0x%02x\n", >> + ret, conflink_mask); >> + return -EIO; >> + } >> + >> + dev_info(&priv->client->dev, >> + "Successfully detected configuration links after %u loops: 0x%02x\n", >> + i, conflink_mask); >> + >> + return 0; >> +} >> + >> +/* ----------------------------------------------------------------------------- >> + * V4L2 Subdev >> + */ >> + >> +static int max9286_set_pixelrate(struct max9286_priv *priv) >> +{ >> + struct max9286_source *source = NULL; >> + u64 pixelrate = 0; >> + >> + for_each_source(priv, source) { >> + struct v4l2_ctrl *ctrl; >> + u64 source_rate = 0; >> + >> + /* Pixel rate is mandatory to be reported by sources. */ >> + ctrl = v4l2_ctrl_find(source->sd->ctrl_handler, >> + V4L2_CID_PIXEL_RATE); >> + if (!ctrl) { >> + pixelrate = 0; >> + break; >> + } >> + >> + /* All source must report the same pixel rate. */ >> + source_rate = v4l2_ctrl_g_ctrl_int64(ctrl); >> + if (!pixelrate) { >> + pixelrate = source_rate; >> + } else if (pixelrate != source_rate) { >> + dev_err(&priv->client->dev, >> + "Unable to calculate pixel rate\n"); >> + return -EINVAL; >> + } >> + } >> + >> + if (!pixelrate) { >> + dev_err(&priv->client->dev, >> + "No pixel rate control available in sources\n"); >> + return -EINVAL; >> + } >> + >> + /* >> + * The CSI-2 transmitter pixel rate is the single source rate multiplied >> + * by the number of available sources. >> + */ >> + return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, >> + pixelrate * priv->nsources); >> +} >> + >> +static int max9286_notify_bound(struct v4l2_async_notifier *notifier, >> + struct v4l2_subdev *subdev, >> + struct v4l2_async_subdev *asd) >> +{ >> + struct max9286_priv *priv = sd_to_max9286(notifier->sd); >> + struct max9286_source *source = asd_to_max9286_source(asd); >> + unsigned int index = to_index(priv, source); >> + unsigned int src_pad; >> + int ret; >> + >> + ret = media_entity_get_fwnode_pad(&subdev->entity, >> + source->fwnode, >> + MEDIA_PAD_FL_SOURCE); >> + if (ret < 0) { >> + dev_err(&priv->client->dev, >> + "Failed to find pad for %s\n", subdev->name); >> + return ret; >> + } >> + >> + priv->bound_sources |= BIT(index); >> + source->sd = subdev; >> + src_pad = ret; >> + >> + ret = media_create_pad_link(&source->sd->entity, src_pad, >> + &priv->sd.entity, index, >> + MEDIA_LNK_FL_ENABLED | >> + MEDIA_LNK_FL_IMMUTABLE); >> + if (ret) { >> + dev_err(&priv->client->dev, >> + "Unable to link %s:%u -> %s:%u\n", >> + source->sd->name, src_pad, priv->sd.name, index); >> + return ret; >> + } >> + >> + dev_dbg(&priv->client->dev, "Bound %s pad: %u on index %u\n", >> + subdev->name, src_pad, index); >> + >> + /* >> + * We can only register v4l2_async_notifiers, which do not provide a >> + * means to register a complete callback. bound_sources allows us to >> + * identify when all remote serializers have completed their probe. >> + */ >> + if (priv->bound_sources != priv->source_mask) >> + return 0; >> + >> + /* >> + * All enabled sources have probed and enabled their reverse control >> + * channels: >> + * >> + * - Verify all configuration links are properly detected >> + * - Disable auto-ack as communication on the control channel are now >> + * stable. >> + */ >> + max9286_check_config_link(priv, priv->source_mask); >> + >> + /* >> + * Re-configure I2C with local acknowledge disabled after cameras have >> + * probed. >> + */ >> + max9286_configure_i2c(priv, false); >> + >> + return max9286_set_pixelrate(priv); >> +} >> + >> +static void max9286_notify_unbind(struct v4l2_async_notifier *notifier, >> + struct v4l2_subdev *subdev, >> + struct v4l2_async_subdev *asd) >> +{ >> + struct max9286_priv *priv = sd_to_max9286(notifier->sd); >> + struct max9286_source *source = asd_to_max9286_source(asd); >> + unsigned int index = to_index(priv, source); >> + >> + source->sd = NULL; >> + priv->bound_sources &= ~BIT(index); >> +} >> + >> +static const struct v4l2_async_notifier_operations max9286_notify_ops = { >> + .bound = max9286_notify_bound, >> + .unbind = max9286_notify_unbind, >> +}; >> + >> +static int max9286_v4l2_notifier_register(struct max9286_priv *priv) >> +{ >> + struct device *dev = &priv->client->dev; >> + struct max9286_source *source = NULL; >> + int ret; >> + >> + if (!priv->nsources) >> + return 0; >> + >> + v4l2_async_notifier_init(&priv->notifier); >> + >> + for_each_source(priv, source) { >> + unsigned int i = to_index(priv, source); >> + >> + source->asd.match_type = V4L2_ASYNC_MATCH_FWNODE; >> + source->asd.match.fwnode = source->fwnode; >> + >> + ret = v4l2_async_notifier_add_subdev(&priv->notifier, >> + &source->asd); >> + if (ret) { >> + dev_err(dev, "Failed to add subdev for source %d", i); >> + v4l2_async_notifier_cleanup(&priv->notifier); >> + return ret; >> + } >> + >> + /* >> + * Balance the reference counting handled through >> + * v4l2_async_notifier_cleanup() >> + */ >> + fwnode_handle_get(source->fwnode); >> + } >> + >> + priv->notifier.ops = &max9286_notify_ops; >> + >> + ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier); >> + if (ret) { >> + dev_err(dev, "Failed to register subdev_notifier"); >> + v4l2_async_notifier_cleanup(&priv->notifier); >> + return ret; >> + } >> + >> + return 0; >> +} >> + >> +static void max9286_v4l2_notifier_unregister(struct max9286_priv *priv) >> +{ >> + if (!priv->nsources) >> + return; >> + >> + v4l2_async_notifier_unregister(&priv->notifier); >> + v4l2_async_notifier_cleanup(&priv->notifier); >> +} >> + >> +static int max9286_s_stream(struct v4l2_subdev *sd, int enable) >> +{ >> + struct max9286_priv *priv = sd_to_max9286(sd); >> + struct max9286_source *source; >> + unsigned int i; >> + bool sync = false; >> + int ret; >> + >> + if (enable) { >> + /* >> + * The frame sync between cameras is transmitted across the >> + * reverse channel as GPIO. We must open all channels while >> + * streaming to allow this synchronisation signal to be shared. >> + */ >> + max9286_i2c_mux_open(priv); >> + >> + /* Start all cameras. */ >> + for_each_source(priv, source) { >> + ret = v4l2_subdev_call(source->sd, video, s_stream, 1); >> + if (ret) >> + return ret; >> + } >> + >> + ret = max9286_check_video_links(priv); >> + if (ret) >> + return ret; >> + >> + /* >> + * Wait until frame synchronization is locked. >> + * >> + * Manual says frame sync locking should take ~6 VTS. >> + * From practical experience at least 8 are required. Give >> + * 12 complete frames time (~400ms at 30 fps) to achieve frame >> + * locking before returning error. >> + */ >> + for (i = 0; i < 40; i++) { >> + if (max9286_read(priv, 0x31) & MAX9286_FSYNC_LOCKED) { >> + sync = true; >> + break; >> + } >> + usleep_range(9000, 11000); >> + } >> + >> + if (!sync) { >> + dev_err(&priv->client->dev, >> + "Failed to get frame synchronization\n"); >> + return -EXDEV; /* Invalid cross-device link */ >> + } >> + >> + /* >> + * Enable CSI output, VC set according to link number. >> + * Bit 7 must be set (chip manual says it's 0 and reserved). >> + */ >> + max9286_write(priv, 0x15, 0x80 | MAX9286_VCTYPE | >> + MAX9286_CSIOUTEN | MAX9286_0X15_RESV); >> + } else { >> + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); >> + >> + /* Stop all cameras. */ >> + for_each_source(priv, source) >> + v4l2_subdev_call(source->sd, video, s_stream, 0); >> + >> + max9286_i2c_mux_close(priv); >> + } >> + >> + return 0; >> +} >> + >> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, >> + struct v4l2_subdev_pad_config *cfg, >> + struct v4l2_subdev_mbus_code_enum *code) >> +{ >> + if (code->pad || code->index > 0) >> + return -EINVAL; >> + >> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; >> + >> + return 0; >> +} >> + >> +static struct v4l2_mbus_framefmt * >> +max9286_get_pad_format(struct max9286_priv *priv, >> + struct v4l2_subdev_pad_config *cfg, >> + unsigned int pad, u32 which) >> +{ >> + switch (which) { >> + case V4L2_SUBDEV_FORMAT_TRY: >> + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); >> + case V4L2_SUBDEV_FORMAT_ACTIVE: >> + return &priv->fmt[pad]; >> + default: >> + return NULL; >> + } >> +} >> + >> +static int max9286_set_fmt(struct v4l2_subdev *sd, >> + struct v4l2_subdev_pad_config *cfg, >> + struct v4l2_subdev_format *format) >> +{ >> + struct max9286_priv *priv = sd_to_max9286(sd); >> + struct v4l2_mbus_framefmt *cfg_fmt; >> + >> + if (format->pad >= MAX9286_SRC_PAD) >> + return -EINVAL; >> + >> + /* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */ >> + switch (format->format.code) { >> + case MEDIA_BUS_FMT_UYVY8_2X8: >> + case MEDIA_BUS_FMT_VYUY8_2X8: >> + case MEDIA_BUS_FMT_YUYV8_2X8: >> + case MEDIA_BUS_FMT_YVYU8_2X8: >> + break; >> + default: >> + format->format.code = MEDIA_BUS_FMT_YUYV8_2X8; > > Is there any reason for not setting default format to MEDIA_BUS_FMT_UYVY8_2X8? > No good reason no, and I see that in max9286_enum_mbus_code(), we currently code to MEDIA_BUS_FMT_YUYV8_2X8, and that's the value that we init to, so that would be a better default indeed. I'll update this for v10. > Thanks, > Mani > >> + break; >> + } >> + >> + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); >> + if (!cfg_fmt) >> + return -EINVAL; >> + >> + mutex_lock(&priv->mutex); >> + *cfg_fmt = format->format; >> + mutex_unlock(&priv->mutex); >> + >> + return 0; >> +} >> + >> +static int max9286_get_fmt(struct v4l2_subdev *sd, >> + struct v4l2_subdev_pad_config *cfg, >> + struct v4l2_subdev_format *format) >> +{ >> + struct max9286_priv *priv = sd_to_max9286(sd); >> + struct v4l2_mbus_framefmt *cfg_fmt; >> + >> + if (format->pad >= MAX9286_SRC_PAD) >> + return -EINVAL; >> + >> + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); >> + if (!cfg_fmt) >> + return -EINVAL; >> + >> + mutex_lock(&priv->mutex); >> + format->format = *cfg_fmt; >> + mutex_unlock(&priv->mutex); >> + >> + return 0; >> +} >> + >> +static const struct v4l2_subdev_video_ops max9286_video_ops = { >> + .s_stream = max9286_s_stream, >> +}; >> + >> +static const struct v4l2_subdev_pad_ops max9286_pad_ops = { >> + .enum_mbus_code = max9286_enum_mbus_code, >> + .get_fmt = max9286_get_fmt, >> + .set_fmt = max9286_set_fmt, >> +}; >> + >> +static const struct v4l2_subdev_ops max9286_subdev_ops = { >> + .video = &max9286_video_ops, >> + .pad = &max9286_pad_ops, >> +}; >> + >> +static void max9286_init_format(struct v4l2_mbus_framefmt *fmt) >> +{ >> + fmt->width = 1280; >> + fmt->height = 800; >> + fmt->code = MEDIA_BUS_FMT_UYVY8_2X8; >> + fmt->colorspace = V4L2_COLORSPACE_SRGB; >> + fmt->field = V4L2_FIELD_NONE; >> + fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; >> + fmt->quantization = V4L2_QUANTIZATION_DEFAULT; >> + fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT; >> +} >> + >> +static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh) >> +{ >> + struct v4l2_mbus_framefmt *format; >> + unsigned int i; >> + >> + for (i = 0; i < MAX9286_N_SINKS; i++) { >> + format = v4l2_subdev_get_try_format(subdev, fh->pad, i); >> + max9286_init_format(format); >> + } >> + >> + return 0; >> +} >> + >> +static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = { >> + .open = max9286_open, >> +}; >> + >> +static int max9286_s_ctrl(struct v4l2_ctrl *ctrl) >> +{ >> + switch (ctrl->id) { >> + case V4L2_CID_PIXEL_RATE: >> + return 0; >> + default: >> + return -EINVAL; >> + } >> +} >> + >> +static const struct v4l2_ctrl_ops max9286_ctrl_ops = { >> + .s_ctrl = max9286_s_ctrl, >> +}; >> + >> +static int max9286_v4l2_register(struct max9286_priv *priv) >> +{ >> + struct device *dev = &priv->client->dev; >> + struct fwnode_handle *ep; >> + int ret; >> + int i; >> + >> + /* Register v4l2 async notifiers for connected Camera subdevices */ >> + ret = max9286_v4l2_notifier_register(priv); >> + if (ret) { >> + dev_err(dev, "Unable to register V4L2 async notifiers\n"); >> + return ret; >> + } >> + >> + /* Configure V4L2 for the MAX9286 itself */ >> + >> + for (i = 0; i < MAX9286_N_SINKS; i++) >> + max9286_init_format(&priv->fmt[i]); >> + >> + v4l2_i2c_subdev_init(&priv->sd, priv->client, &max9286_subdev_ops); >> + priv->sd.internal_ops = &max9286_subdev_internal_ops; >> + priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; >> + >> + v4l2_ctrl_handler_init(&priv->ctrls, 1); >> + priv->pixelrate = v4l2_ctrl_new_std(&priv->ctrls, >> + &max9286_ctrl_ops, >> + V4L2_CID_PIXEL_RATE, >> + 1, INT_MAX, 1, 50000000); >> + >> + priv->sd.ctrl_handler = &priv->ctrls; >> + ret = priv->ctrls.error; >> + if (ret) >> + goto err_async; >> + >> + priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; >> + >> + priv->pads[MAX9286_SRC_PAD].flags = MEDIA_PAD_FL_SOURCE; >> + for (i = 0; i < MAX9286_SRC_PAD; i++) >> + priv->pads[i].flags = MEDIA_PAD_FL_SINK; >> + ret = media_entity_pads_init(&priv->sd.entity, MAX9286_N_PADS, >> + priv->pads); >> + if (ret) >> + goto err_async; >> + >> + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), MAX9286_SRC_PAD, >> + 0, 0); >> + if (!ep) { >> + dev_err(dev, "Unable to retrieve endpoint on \"port@4\"\n"); >> + ret = -ENOENT; >> + goto err_async; >> + } >> + priv->sd.fwnode = ep; >> + >> + ret = v4l2_async_register_subdev(&priv->sd); >> + if (ret < 0) { >> + dev_err(dev, "Unable to register subdevice\n"); >> + goto err_put_node; >> + } >> + >> + return 0; >> + >> +err_put_node: >> + fwnode_handle_put(ep); >> +err_async: >> + max9286_v4l2_notifier_unregister(priv); >> + >> + return ret; >> +} >> + >> +static void max9286_v4l2_unregister(struct max9286_priv *priv) >> +{ >> + fwnode_handle_put(priv->sd.fwnode); >> + v4l2_async_unregister_subdev(&priv->sd); >> + max9286_v4l2_notifier_unregister(priv); >> +} >> + >> +/* ----------------------------------------------------------------------------- >> + * Probe/Remove >> + */ >> + >> +static int max9286_setup(struct max9286_priv *priv) >> +{ >> + /* >> + * Link ordering values for all enabled links combinations. Orders must >> + * be assigned sequentially from 0 to the number of enabled links >> + * without leaving any hole for disabled links. We thus assign orders to >> + * enabled links first, and use the remaining order values for disabled >> + * links are all links must have a different order value; >> + */ >> + static const u8 link_order[] = { >> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxxx */ >> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxx0 */ >> + (3 << 6) | (2 << 4) | (0 << 2) | (1 << 0), /* xx0x */ >> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xx10 */ >> + (3 << 6) | (0 << 4) | (2 << 2) | (1 << 0), /* x0xx */ >> + (3 << 6) | (1 << 4) | (2 << 2) | (0 << 0), /* x1x0 */ >> + (3 << 6) | (1 << 4) | (0 << 2) | (2 << 0), /* x10x */ >> + (3 << 6) | (1 << 4) | (1 << 2) | (0 << 0), /* x210 */ >> + (0 << 6) | (3 << 4) | (2 << 2) | (1 << 0), /* 0xxx */ >> + (1 << 6) | (3 << 4) | (2 << 2) | (0 << 0), /* 1xx0 */ >> + (1 << 6) | (3 << 4) | (0 << 2) | (2 << 0), /* 1x0x */ >> + (2 << 6) | (3 << 4) | (1 << 2) | (0 << 0), /* 2x10 */ >> + (1 << 6) | (0 << 4) | (3 << 2) | (2 << 0), /* 10xx */ >> + (2 << 6) | (1 << 4) | (3 << 2) | (0 << 0), /* 21x0 */ >> + (2 << 6) | (1 << 4) | (0 << 2) | (3 << 0), /* 210x */ >> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* 3210 */ >> + }; >> + >> + /* >> + * Set the I2C bus speed. >> + * >> + * Enable I2C Local Acknowledge during the probe sequences of the camera >> + * only. This should be disabled after the mux is initialised. >> + */ >> + max9286_configure_i2c(priv, true); >> + >> + /* >> + * Reverse channel setup. >> + * >> + * - Enable custom reverse channel configuration (through register 0x3f) >> + * and set the first pulse length to 35 clock cycles. >> + * - Increase the reverse channel amplitude to 170mV to accommodate the >> + * high threshold enabled by the serializer driver. >> + */ >> + max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35)); >> + max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) | >> + MAX9286_REV_AMP_X); >> + usleep_range(2000, 2500); >> + >> + /* >> + * Enable GMSL links, mask unused ones and autodetect link >> + * used as CSI clock source. >> + */ >> + max9286_write(priv, 0x00, MAX9286_MSTLINKSEL_AUTO | priv->route_mask); >> + max9286_write(priv, 0x0b, link_order[priv->route_mask]); >> + max9286_write(priv, 0x69, (0xf & ~priv->route_mask)); >> + >> + /* >> + * Video format setup: >> + * Disable CSI output, VC is set according to Link number. >> + */ >> + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); >> + >> + /* Enable CSI-2 Lane D0-D3 only, DBL mode, YUV422 8-bit. */ >> + max9286_write(priv, 0x12, MAX9286_CSIDBL | MAX9286_DBL | >> + MAX9286_CSILANECNT(priv->csi2_data_lanes) | >> + MAX9286_DATATYPE_YUV422_8BIT); >> + >> + /* Automatic: FRAMESYNC taken from the slowest Link. */ >> + max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ | >> + MAX9286_FSYNCMETH_AUTO); >> + >> + /* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */ >> + max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS | >> + MAX9286_HVSRC_D14); >> + >> + /* >> + * The overlap window seems to provide additional validation by tracking >> + * the delay between vsync and frame sync, generating an error if the >> + * delay is bigger than the programmed window, though it's not yet clear >> + * what value should be set. >> + * >> + * As it's an optional value and can be disabled, we do so by setting >> + * a 0 overlap value. >> + */ >> + max9286_write(priv, 0x63, 0); >> + max9286_write(priv, 0x64, 0); >> + >> + /* >> + * Wait for 2ms to allow the link to resynchronize after the >> + * configuration change. >> + */ >> + usleep_range(2000, 5000); >> + >> + return 0; >> +} >> + >> +static void max9286_gpio_set(struct gpio_chip *chip, >> + unsigned int offset, int value) >> +{ >> + struct max9286_priv *priv = gpiochip_get_data(chip); >> + >> + if (value) >> + priv->gpio_state |= BIT(offset); >> + else >> + priv->gpio_state &= ~BIT(offset); >> + >> + max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state); >> +} >> + >> +static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset) >> +{ >> + struct max9286_priv *priv = gpiochip_get_data(chip); >> + >> + return priv->gpio_state & BIT(offset); >> +} >> + >> +static int max9286_register_gpio(struct max9286_priv *priv) >> +{ >> + struct device *dev = &priv->client->dev; >> + struct gpio_chip *gpio = &priv->gpio; >> + int ret; >> + >> + static const char * const names[] = { >> + "GPIO0OUT", >> + "GPIO1OUT", >> + }; >> + >> + /* Configure the GPIO */ >> + gpio->label = dev_name(dev); >> + gpio->parent = dev; >> + gpio->owner = THIS_MODULE; >> + gpio->of_node = dev->of_node; >> + gpio->ngpio = 2; >> + gpio->base = -1; >> + gpio->set = max9286_gpio_set; >> + gpio->get = max9286_gpio_get; >> + gpio->can_sleep = true; >> + gpio->names = names; >> + >> + /* GPIO values default to high */ >> + priv->gpio_state = BIT(0) | BIT(1); >> + >> + ret = devm_gpiochip_add_data(dev, gpio, priv); >> + if (ret) >> + dev_err(dev, "Unable to create gpio_chip\n"); >> + >> + return ret; >> +} >> + >> +static int max9286_init(struct device *dev) >> +{ >> + struct max9286_priv *priv; >> + struct i2c_client *client; >> + int ret; >> + >> + client = to_i2c_client(dev); >> + priv = i2c_get_clientdata(client); >> + >> + /* Enable the bus power. */ >> + ret = regulator_enable(priv->regulator); >> + if (ret < 0) { >> + dev_err(&client->dev, "Unable to turn PoC on\n"); >> + return ret; >> + } >> + >> + ret = max9286_setup(priv); >> + if (ret) { >> + dev_err(dev, "Unable to setup max9286\n"); >> + goto err_regulator; >> + } >> + >> + /* >> + * Register all V4L2 interactions for the MAX9286 and notifiers for >> + * any subdevices connected. >> + */ >> + ret = max9286_v4l2_register(priv); >> + if (ret) { >> + dev_err(dev, "Failed to register with V4L2\n"); >> + goto err_regulator; >> + } >> + >> + ret = max9286_i2c_mux_init(priv); >> + if (ret) { >> + dev_err(dev, "Unable to initialize I2C multiplexer\n"); >> + goto err_v4l2_register; >> + } >> + >> + /* Leave the mux channels disabled until they are selected. */ >> + max9286_i2c_mux_close(priv); >> + >> + return 0; >> + >> +err_v4l2_register: >> + max9286_v4l2_unregister(priv); >> +err_regulator: >> + regulator_disable(priv->regulator); >> + >> + return ret; >> +} >> + >> +static void max9286_cleanup_dt(struct max9286_priv *priv) >> +{ >> + struct max9286_source *source; >> + >> + for_each_source(priv, source) { >> + fwnode_handle_put(source->fwnode); >> + source->fwnode = NULL; >> + } >> +} >> + >> +static int max9286_parse_dt(struct max9286_priv *priv) >> +{ >> + struct device *dev = &priv->client->dev; >> + struct device_node *i2c_mux; >> + struct device_node *node = NULL; >> + unsigned int i2c_mux_mask = 0; >> + >> + of_node_get(dev->of_node); >> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); >> + if (!i2c_mux) { >> + dev_err(dev, "Failed to find i2c-mux node\n"); >> + of_node_put(dev->of_node); >> + return -EINVAL; >> + } >> + >> + /* Identify which i2c-mux channels are enabled */ >> + for_each_child_of_node(i2c_mux, node) { >> + u32 id = 0; >> + >> + of_property_read_u32(node, "reg", &id); >> + if (id >= MAX9286_NUM_GMSL) >> + continue; >> + >> + if (!of_device_is_available(node)) { >> + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); >> + continue; >> + } >> + >> + i2c_mux_mask |= BIT(id); >> + } >> + of_node_put(node); >> + of_node_put(i2c_mux); >> + >> + /* Parse the endpoints */ >> + for_each_endpoint_of_node(dev->of_node, node) { >> + struct max9286_source *source; >> + struct of_endpoint ep; >> + >> + of_graph_parse_endpoint(node, &ep); >> + dev_dbg(dev, "Endpoint %pOF on port %d", >> + ep.local_node, ep.port); >> + >> + if (ep.port > MAX9286_NUM_GMSL) { >> + dev_err(dev, "Invalid endpoint %s on port %d", >> + of_node_full_name(ep.local_node), ep.port); >> + continue; >> + } >> + >> + /* For the source endpoint just parse the bus configuration. */ >> + if (ep.port == MAX9286_SRC_PAD) { >> + struct v4l2_fwnode_endpoint vep = { >> + .bus_type = V4L2_MBUS_CSI2_DPHY >> + }; >> + int ret; >> + >> + ret = v4l2_fwnode_endpoint_parse( >> + of_fwnode_handle(node), &vep); >> + if (ret) { >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + return ret; >> + } >> + >> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { >> + dev_err(dev, >> + "Media bus %u type not supported\n", >> + vep.bus_type); >> + v4l2_fwnode_endpoint_free(&vep); >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + return -EINVAL; >> + } >> + >> + priv->csi2_data_lanes = >> + vep.bus.mipi_csi2.num_data_lanes; >> + v4l2_fwnode_endpoint_free(&vep); >> + >> + continue; >> + } >> + >> + /* Skip if the corresponding GMSL link is unavailable. */ >> + if (!(i2c_mux_mask & BIT(ep.port))) >> + continue; >> + >> + if (priv->sources[ep.port].fwnode) { >> + dev_err(dev, >> + "Multiple port endpoints are not supported: %d", >> + ep.port); >> + >> + continue; >> + } >> + >> + source = &priv->sources[ep.port]; >> + source->fwnode = fwnode_graph_get_remote_endpoint( >> + of_fwnode_handle(node)); >> + if (!source->fwnode) { >> + dev_err(dev, >> + "Endpoint %pOF has no remote endpoint connection\n", >> + ep.local_node); >> + >> + continue; >> + } >> + >> + priv->source_mask |= BIT(ep.port); >> + priv->nsources++; >> + } >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + >> + priv->route_mask = priv->source_mask; >> + >> + return 0; >> +} >> + >> +static int max9286_probe(struct i2c_client *client) >> +{ >> + struct max9286_priv *priv; >> + int ret; >> + >> + priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); >> + if (!priv) >> + return -ENOMEM; >> + >> + mutex_init(&priv->mutex); >> + >> + priv->client = client; >> + i2c_set_clientdata(client, priv); >> + >> + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", >> + GPIOD_OUT_HIGH); >> + if (IS_ERR(priv->gpiod_pwdn)) >> + return PTR_ERR(priv->gpiod_pwdn); >> + >> + gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn"); >> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 1); >> + >> + /* Wait at least 4ms before the I2C lines latch to the address */ >> + if (priv->gpiod_pwdn) >> + usleep_range(4000, 5000); >> + >> + /* >> + * The MAX9286 starts by default with all ports enabled, we disable all >> + * ports early to ensure that all channels are disabled if we error out >> + * and keep the bus consistent. >> + */ >> + max9286_i2c_mux_close(priv); >> + >> + /* >> + * The MAX9286 initialises with auto-acknowledge enabled by default. >> + * This can be invasive to other transactions on the same bus, so >> + * disable it early. It will be enabled only as and when needed. >> + */ >> + max9286_configure_i2c(priv, false); >> + >> + ret = max9286_register_gpio(priv); >> + if (ret) >> + goto err_powerdown; >> + >> + priv->regulator = devm_regulator_get(&client->dev, "poc"); >> + if (IS_ERR(priv->regulator)) { >> + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) >> + dev_err(&client->dev, >> + "Unable to get PoC regulator (%ld)\n", >> + PTR_ERR(priv->regulator)); >> + ret = PTR_ERR(priv->regulator); >> + goto err_powerdown; >> + } >> + >> + ret = max9286_parse_dt(priv); >> + if (ret) >> + goto err_powerdown; >> + >> + ret = max9286_init(&client->dev); >> + if (ret < 0) >> + goto err_cleanup_dt; >> + >> + return 0; >> + >> +err_cleanup_dt: >> + max9286_cleanup_dt(priv); >> +err_powerdown: >> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); >> + >> + return ret; >> +} >> + >> +static int max9286_remove(struct i2c_client *client) >> +{ >> + struct max9286_priv *priv = i2c_get_clientdata(client); >> + >> + i2c_mux_del_adapters(priv->mux); >> + >> + max9286_v4l2_unregister(priv); >> + >> + regulator_disable(priv->regulator); >> + >> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); >> + >> + max9286_cleanup_dt(priv); >> + >> + return 0; >> +} >> + >> +static const struct of_device_id max9286_dt_ids[] = { >> + { .compatible = "maxim,max9286" }, >> + {}, >> +}; >> +MODULE_DEVICE_TABLE(of, max9286_dt_ids); >> + >> +static struct i2c_driver max9286_i2c_driver = { >> + .driver = { >> + .name = "max9286", >> + .of_match_table = of_match_ptr(max9286_dt_ids), >> + }, >> + .probe_new = max9286_probe, >> + .remove = max9286_remove, >> +}; >> + >> +module_i2c_driver(max9286_i2c_driver); >> + >> +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); >> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); >> +MODULE_LICENSE("GPL"); >> -- >> 2.25.1 >>
On Thu, May 14, 2020 at 10:53:00AM +0100, Kieran Bingham wrote: > Hi Mani, > > On 12/05/2020 18:40, Manivannan Sadhasivam wrote: > > Hi Kieran, > > > > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > >> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and > >> CSI-2 output. The device supports multicamera streaming applications, > >> and features the ability to synchronise the attached cameras. > >> > >> CSI-2 output can be configured with 1 to 4 lanes, and a control channel > >> is supported over I2C, which implements an I2C mux to facilitate > >> communications with connected cameras across the reverse control > >> channel. > >> > >> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> > >> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > >> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > >> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > >> > >> -- > >> v2: > >> - Fix MAINTAINERS entry > >> > >> This posting is released with the following modifications to work > >> without Sakari's VC developments: > >> - max9286_g_mbus_config() re-instated > >> - max9286_get_frame_desc() is not bus/csi aware > >> - max9286_{get,set}_routing() removed > >> > >> v3: > >> - Initialise notifier with v4l2_async_notifier_init > >> - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY > >> > >> v4: - Re-introduce required code to function with the VC series. > >> > >> - Implement max9286_get_routing, max9286_set_routing > >> - Remove max9286_g_mbus_config > >> > >> v5: (internal release) > >> - Fix printk formatting for hex value > >> - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) > >> - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE > >> - Remove 'device is bound' workaround > >> > >> v6: > >> - v4l2_subdev_krouting instead of v4l2_subdev_routing separated > >> to allow integration without the VC/V4L2-Mux series. > >> - convert sd_to_max9286 to inline function > >> - rename max9286_device to max9286_priv > >> - Cleanup the v4l2_async_notifier > >> - Extend MODULE_AUTHOR > >> - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id > >> - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) > >> - Use new YAML file reference in MAINTAINERS > >> - Parse new i2c-mux node in max9286_get_i2c_by_id > >> (This could/should be refactored to parse these separately first) > >> - Spelling and calculation fixes in the FSYNC_LOCKED check comments > >> - Identify each enabled i2c-mux channel in a single pass > >> - max9286: Improve mux-state readbility [v2] > >> - Fix frame sync lock durations > >> - Add comment to describe /why/ we must open the mux in s_stream > >> - use -EXDEV as return code for failed link synchronisation. > >> - Fix reference counting of the dt nodeS > >> - Convert to probe_new for I2C > >> - Remove redundant max9286_i2c_mux_state > >> - Provide optional enable-gpio (max9286-pwdn) > >> > >> v7: > >> [Kieran] > >> - Ensure powerdown lines are optional > >> - Add a 4ms power-up delay > >> - Add max9286_check_config_link() to core > >> - Add GPIO chip controller for GPIO0OUT and GPIO1OUT > >> - Fix GPIO registration > >> - max9286: Split out async registration > >> (fixes regulator -EPROBE_DEFERs failures) > >> - Collect all V4L2 registrations > >> - balance v4l2_async refcnting > >> - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ > >> > >> [Jacopo] > >> - Remove redundanct MAXIM_I2C_SPEED macros > >> - Move notifiers operations > >> - Add delay after reverse channel reconfiguration > >> - Move link setup to completion > >> - Fix up max9286_check_config_link() implementation > >> - Remove redundant dual configuration of reverse channel > >> > >> v8: > >> > >> [Kieran] > >> - Update the bound_sources mask on unbind > >> - Convert probe kzalloc usage to devm_ variant > >> - Fix up cleanup path from GPIO PowerDown registration > >> - cleanup GPIO device registration fail path > >> - Convert to use devm_regulator_get() > >> - Fit max9286_parse_dt print on one line > >> - Move multi-device workarounds out of upstream driver > >> - Remove I2C mod-table > >> - Lock format changes > >> - Describe pad index usage > >> - Remove poc_enabled workaround > >> - Rename the max9286_gpio to be more explicit on it's actions. > >> - Move max9286_init_format call > >> - Rework probe sequence and simplify error paths. > >> - Simplify i2c comments > >> - Implement Pixelrate control > >> - Disable overlap window > >> > >> [Jacopo] > >> - Adapt Kconfig to latest upstream changes > >> - Put of node on error > >> - Calculate pixel rate > >> - Simplify overlap window disablement > >> > >> v9: > >> > >> [Kieran] > >> - Kconfig: Depend on OF > >> - Re-sort addition to Makefile > >> --- > >> MAINTAINERS | 10 + > >> drivers/media/i2c/Kconfig | 13 + > >> drivers/media/i2c/Makefile | 1 + > >> drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ > >> 4 files changed, 1356 insertions(+) > >> create mode 100644 drivers/media/i2c/max9286.c > >> > >> diff --git a/MAINTAINERS b/MAINTAINERS > >> index a7bb6e22d5da..99e3bf7760fd 100644 > >> --- a/MAINTAINERS > >> +++ b/MAINTAINERS > >> @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst > >> F: drivers/hwmon/max6697.c > >> F: include/linux/platform_data/max6697.h > >> > >> +MAX9286 QUAD GMSL DESERIALIZER DRIVER > >> +M: Jacopo Mondi <jacopo+renesas@jmondi.org> > >> +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > >> +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > >> +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > >> +L: linux-media@vger.kernel.org > >> +S: Maintained > >> +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml > >> +F: drivers/media/i2c/max9286.c > >> + > >> MAX9860 MONO AUDIO VOICE CODEC DRIVER > >> M: Peter Rosin <peda@axentia.se> > >> L: alsa-devel@alsa-project.org (moderated for non-subscribers) > >> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig > >> index 3abc80373ec0..2e390f41f6da 100644 > >> --- a/drivers/media/i2c/Kconfig > >> +++ b/drivers/media/i2c/Kconfig > >> @@ -464,6 +464,19 @@ config VIDEO_VPX3220 > >> To compile this driver as a module, choose M here: the > >> module will be called vpx3220. > >> > >> +config VIDEO_MAX9286 > >> + tristate "Maxim MAX9286 GMSL deserializer support" > >> + depends on I2C && I2C_MUX > >> + depends on OF > >> + select V4L2_FWNODE > >> + select VIDEO_V4L2_SUBDEV_API > >> + select MEDIA_CONTROLLER > >> + help > >> + This driver supports the Maxim MAX9286 GMSL deserializer. > >> + > >> + To compile this driver as a module, choose M here: the > >> + module will be called max9286. > >> + > >> comment "Video and audio decoders" > >> > >> config VIDEO_SAA717X > >> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile > >> index 77bf7d0b691f..f0b001ee4b05 100644 > >> --- a/drivers/media/i2c/Makefile > >> +++ b/drivers/media/i2c/Makefile > >> @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o > >> obj-$(CONFIG_VIDEO_IMX290) += imx290.o > >> obj-$(CONFIG_VIDEO_IMX319) += imx319.o > >> obj-$(CONFIG_VIDEO_IMX355) += imx355.o > >> +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o > >> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o > >> > >> obj-$(CONFIG_SDR_MAX2175) += max2175.o > >> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c > >> new file mode 100644 > >> index 000000000000..481d65f2b51d > >> --- /dev/null > >> +++ b/drivers/media/i2c/max9286.c > >> @@ -0,0 +1,1332 @@ > >> +// SPDX-License-Identifier: GPL-2.0+ > >> +/* > >> + * Maxim MAX9286 GMSL Deserializer Driver > >> + * > >> + * Copyright (C) 2017-2019 Jacopo Mondi > >> + * Copyright (C) 2017-2019 Kieran Bingham > >> + * Copyright (C) 2017-2019 Laurent Pinchart > >> + * Copyright (C) 2017-2019 Niklas Söderlund > >> + * Copyright (C) 2016 Renesas Electronics Corporation > >> + * Copyright (C) 2015 Cogent Embedded, Inc. > >> + */ > >> + > >> +#include <linux/delay.h> > >> +#include <linux/device.h> > >> +#include <linux/fwnode.h> > >> +#include <linux/gpio/consumer.h> > >> +#include <linux/gpio/driver.h> > >> +#include <linux/i2c.h> > >> +#include <linux/i2c-mux.h> > >> +#include <linux/module.h> > >> +#include <linux/mutex.h> > >> +#include <linux/of_graph.h> > >> +#include <linux/regulator/consumer.h> > >> +#include <linux/slab.h> > >> + > >> +#include <media/v4l2-async.h> > >> +#include <media/v4l2-ctrls.h> > >> +#include <media/v4l2-device.h> > >> +#include <media/v4l2-fwnode.h> > >> +#include <media/v4l2-subdev.h> > >> + > >> +/* Register 0x00 */ > >> +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) > >> +#define MAX9286_MSTLINKSEL(n) ((n) << 5) > >> +#define MAX9286_EN_VS_GEN BIT(4) > >> +#define MAX9286_LINKEN(n) (1 << (n)) > >> +/* Register 0x01 */ > >> +#define MAX9286_FSYNCMODE_ECU (3 << 6) > >> +#define MAX9286_FSYNCMODE_EXT (2 << 6) > >> +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) > >> +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) > >> +#define MAX9286_GPIEN BIT(5) > >> +#define MAX9286_ENLMO_RSTFSYNC BIT(2) > >> +#define MAX9286_FSYNCMETH_AUTO (2 << 0) > >> +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) > >> +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) > >> +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 > >> +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 > >> +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 > >> +/* Register 0x0a */ > >> +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) > >> +#define MAX9286_REVCCEN(n) (1 << (n)) > >> +/* Register 0x0c */ > >> +#define MAX9286_HVEN BIT(7) > >> +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) > >> +#define MAX9286_EDC_6BIT_CRC (1 << 5) > >> +#define MAX9286_EDC_1BIT_PARITY (0 << 5) > >> +#define MAX9286_DESEL BIT(4) > >> +#define MAX9286_INVVS BIT(3) > >> +#define MAX9286_INVHS BIT(2) > >> +#define MAX9286_HVSRC_D0 (2 << 0) > >> +#define MAX9286_HVSRC_D14 (1 << 0) > >> +#define MAX9286_HVSRC_D18 (0 << 0) > >> +/* Register 0x0f */ > >> +#define MAX9286_0X0F_RESERVED BIT(3) > >> +/* Register 0x12 */ > >> +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) > >> +#define MAX9286_CSIDBL BIT(5) > >> +#define MAX9286_DBL BIT(4) > >> +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) > >> +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) > >> +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) > >> +#define MAX9286_DATATYPE_RAW14 (8 << 0) > >> +#define MAX9286_DATATYPE_RAW11 (7 << 0) > >> +#define MAX9286_DATATYPE_RAW10 (6 << 0) > >> +#define MAX9286_DATATYPE_RAW8 (5 << 0) > >> +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) > >> +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) > >> +#define MAX9286_DATATYPE_RGB555 (2 << 0) > >> +#define MAX9286_DATATYPE_RGB565 (1 << 0) > >> +#define MAX9286_DATATYPE_RGB888 (0 << 0) > >> +/* Register 0x15 */ > >> +#define MAX9286_VC(n) ((n) << 5) > >> +#define MAX9286_VCTYPE BIT(4) > >> +#define MAX9286_CSIOUTEN BIT(3) > >> +#define MAX9286_0X15_RESV (3 << 0) > >> +/* Register 0x1b */ > >> +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) > >> +#define MAX9286_ENEQ(n) (1 << (n)) > >> +/* Register 0x27 */ > >> +#define MAX9286_LOCKED BIT(7) > >> +/* Register 0x31 */ > >> +#define MAX9286_FSYNC_LOCKED BIT(6) > >> +/* Register 0x34 */ > >> +#define MAX9286_I2CLOCACK BIT(7) > >> +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) > >> +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) > >> +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) > >> +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) > >> +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) > >> +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) > >> +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) > >> +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) > >> +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) > >> +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) > >> +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) > >> +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) > >> +#define MAX9286_I2CSLVTO_NONE (3 << 0) > >> +#define MAX9286_I2CSLVTO_1024US (2 << 0) > >> +#define MAX9286_I2CSLVTO_256US (1 << 0) > >> +#define MAX9286_I2CSLVTO_64US (0 << 0) > >> +/* Register 0x3b */ > >> +#define MAX9286_REV_TRF(n) ((n) << 4) > >> +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ > >> +#define MAX9286_REV_AMP_X BIT(0) > >> +/* Register 0x3f */ > >> +#define MAX9286_EN_REV_CFG BIT(6) > >> +#define MAX9286_REV_FLEN(n) ((n) - 20) > >> +/* Register 0x49 */ > >> +#define MAX9286_VIDEO_DETECT_MASK 0x0f > >> +/* Register 0x69 */ > >> +#define MAX9286_LFLTBMONMASKED BIT(7) > >> +#define MAX9286_LOCKMONMASKED BIT(6) > >> +#define MAX9286_AUTOCOMBACKEN BIT(5) > >> +#define MAX9286_AUTOMASKEN BIT(4) > >> +#define MAX9286_MASKLINK(n) ((n) << 0) > >> + > >> +/* > >> + * The sink and source pads are created to match the OF graph port numbers so > >> + * that their indexes can be used interchangeably. > >> + */ > >> +#define MAX9286_NUM_GMSL 4 > >> +#define MAX9286_N_SINKS 4 > >> +#define MAX9286_N_PADS 5 > >> +#define MAX9286_SRC_PAD 4 > >> + > >> +struct max9286_source { > >> + struct v4l2_async_subdev asd; > >> + struct v4l2_subdev *sd; > >> + struct fwnode_handle *fwnode; > >> +}; > >> + > >> +#define asd_to_max9286_source(_asd) \ > >> + container_of(_asd, struct max9286_source, asd) > >> + > >> +struct max9286_priv { > >> + struct i2c_client *client; > >> + struct gpio_desc *gpiod_pwdn; > >> + struct v4l2_subdev sd; > >> + struct media_pad pads[MAX9286_N_PADS]; > >> + struct regulator *regulator; > >> + > >> + struct gpio_chip gpio; > >> + u8 gpio_state; > >> + > >> + struct i2c_mux_core *mux; > >> + unsigned int mux_channel; > >> + bool mux_open; > >> + > >> + struct v4l2_ctrl_handler ctrls; > >> + struct v4l2_ctrl *pixelrate; > >> + > >> + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; > >> + > >> + /* Protects controls and fmt structures */ > >> + struct mutex mutex; > >> + > >> + unsigned int nsources; > >> + unsigned int source_mask; > >> + unsigned int route_mask; > >> + unsigned int bound_sources; > >> + unsigned int csi2_data_lanes; > >> + struct max9286_source sources[MAX9286_NUM_GMSL]; > >> + struct v4l2_async_notifier notifier; > >> +}; > >> + [...] > >> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > >> + struct v4l2_subdev_pad_config *cfg, > >> + struct v4l2_subdev_mbus_code_enum *code) > >> +{ > >> + if (code->pad || code->index > 0) > >> + return -EINVAL; > >> + > >> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; > >> + > >> + return 0; > >> +} > >> + > >> +static struct v4l2_mbus_framefmt * > >> +max9286_get_pad_format(struct max9286_priv *priv, > >> + struct v4l2_subdev_pad_config *cfg, > >> + unsigned int pad, u32 which) > >> +{ > >> + switch (which) { > >> + case V4L2_SUBDEV_FORMAT_TRY: > >> + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); > >> + case V4L2_SUBDEV_FORMAT_ACTIVE: > >> + return &priv->fmt[pad]; > >> + default: > >> + return NULL; > >> + } > >> +} > >> + > >> +static int max9286_set_fmt(struct v4l2_subdev *sd, > >> + struct v4l2_subdev_pad_config *cfg, > >> + struct v4l2_subdev_format *format) > >> +{ > >> + struct max9286_priv *priv = sd_to_max9286(sd); > >> + struct v4l2_mbus_framefmt *cfg_fmt; > >> + > >> + if (format->pad >= MAX9286_SRC_PAD) > >> + return -EINVAL; > >> + > >> + /* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */ > >> + switch (format->format.code) { > >> + case MEDIA_BUS_FMT_UYVY8_2X8: > >> + case MEDIA_BUS_FMT_VYUY8_2X8: > >> + case MEDIA_BUS_FMT_YUYV8_2X8: > >> + case MEDIA_BUS_FMT_YVYU8_2X8: > >> + break; > >> + default: > >> + format->format.code = MEDIA_BUS_FMT_YUYV8_2X8; > > > > Is there any reason for not setting default format to MEDIA_BUS_FMT_UYVY8_2X8? > > > > > No good reason no, and I see that in max9286_enum_mbus_code(), we > currently code to MEDIA_BUS_FMT_YUYV8_2X8, and that's the value that we > init to, so that would be a better default indeed. > max9286_enum_mbus_code() returns MEDIA_BUS_FMT_UYVY8_2X8, no? Thanks, Mani > I'll update this for v10. > > > > Thanks, > > Mani > > > >> + break; > >> + } > >> + > >> + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); > >> + if (!cfg_fmt) > >> + return -EINVAL; > >> + > >> + mutex_lock(&priv->mutex); > >> + *cfg_fmt = format->format; > >> + mutex_unlock(&priv->mutex); > >> + > >> + return 0; > >> +} > >> + > >> +static int max9286_get_fmt(struct v4l2_subdev *sd, > >> + struct v4l2_subdev_pad_config *cfg, > >> + struct v4l2_subdev_format *format) > >> +{ > >> + struct max9286_priv *priv = sd_to_max9286(sd); > >> + struct v4l2_mbus_framefmt *cfg_fmt; > >> + > >> + if (format->pad >= MAX9286_SRC_PAD) > >> + return -EINVAL; > >> + > >> + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); > >> + if (!cfg_fmt) > >> + return -EINVAL; > >> + > >> + mutex_lock(&priv->mutex); > >> + format->format = *cfg_fmt; > >> + mutex_unlock(&priv->mutex); > >> + > >> + return 0; > >> +} > >> + > >> +static const struct v4l2_subdev_video_ops max9286_video_ops = { > >> + .s_stream = max9286_s_stream, > >> +}; > >> + > >> +static const struct v4l2_subdev_pad_ops max9286_pad_ops = { > >> + .enum_mbus_code = max9286_enum_mbus_code, > >> + .get_fmt = max9286_get_fmt, > >> + .set_fmt = max9286_set_fmt, > >> +}; > >> + > >> +static const struct v4l2_subdev_ops max9286_subdev_ops = { > >> + .video = &max9286_video_ops, > >> + .pad = &max9286_pad_ops, > >> +}; > >> + > >> +static void max9286_init_format(struct v4l2_mbus_framefmt *fmt) > >> +{ > >> + fmt->width = 1280; > >> + fmt->height = 800; > >> + fmt->code = MEDIA_BUS_FMT_UYVY8_2X8; > >> + fmt->colorspace = V4L2_COLORSPACE_SRGB; > >> + fmt->field = V4L2_FIELD_NONE; > >> + fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; > >> + fmt->quantization = V4L2_QUANTIZATION_DEFAULT; > >> + fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT; > >> +} > >> + > >> +static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh) > >> +{ > >> + struct v4l2_mbus_framefmt *format; > >> + unsigned int i; > >> + > >> + for (i = 0; i < MAX9286_N_SINKS; i++) { > >> + format = v4l2_subdev_get_try_format(subdev, fh->pad, i); > >> + max9286_init_format(format); > >> + } > >> + > >> + return 0; > >> +} > >> + > >> +static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = { > >> + .open = max9286_open, > >> +}; > >> + > >> +static int max9286_s_ctrl(struct v4l2_ctrl *ctrl) > >> +{ > >> + switch (ctrl->id) { > >> + case V4L2_CID_PIXEL_RATE: > >> + return 0; > >> + default: > >> + return -EINVAL; > >> + } > >> +} > >> + > >> +static const struct v4l2_ctrl_ops max9286_ctrl_ops = { > >> + .s_ctrl = max9286_s_ctrl, > >> +}; > >> + > >> +static int max9286_v4l2_register(struct max9286_priv *priv) > >> +{ > >> + struct device *dev = &priv->client->dev; > >> + struct fwnode_handle *ep; > >> + int ret; > >> + int i; > >> + > >> + /* Register v4l2 async notifiers for connected Camera subdevices */ > >> + ret = max9286_v4l2_notifier_register(priv); > >> + if (ret) { > >> + dev_err(dev, "Unable to register V4L2 async notifiers\n"); > >> + return ret; > >> + } > >> + > >> + /* Configure V4L2 for the MAX9286 itself */ > >> + > >> + for (i = 0; i < MAX9286_N_SINKS; i++) > >> + max9286_init_format(&priv->fmt[i]); > >> + > >> + v4l2_i2c_subdev_init(&priv->sd, priv->client, &max9286_subdev_ops); > >> + priv->sd.internal_ops = &max9286_subdev_internal_ops; > >> + priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; > >> + > >> + v4l2_ctrl_handler_init(&priv->ctrls, 1); > >> + priv->pixelrate = v4l2_ctrl_new_std(&priv->ctrls, > >> + &max9286_ctrl_ops, > >> + V4L2_CID_PIXEL_RATE, > >> + 1, INT_MAX, 1, 50000000); > >> + > >> + priv->sd.ctrl_handler = &priv->ctrls; > >> + ret = priv->ctrls.error; > >> + if (ret) > >> + goto err_async; > >> + > >> + priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; > >> + > >> + priv->pads[MAX9286_SRC_PAD].flags = MEDIA_PAD_FL_SOURCE; > >> + for (i = 0; i < MAX9286_SRC_PAD; i++) > >> + priv->pads[i].flags = MEDIA_PAD_FL_SINK; > >> + ret = media_entity_pads_init(&priv->sd.entity, MAX9286_N_PADS, > >> + priv->pads); > >> + if (ret) > >> + goto err_async; > >> + > >> + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), MAX9286_SRC_PAD, > >> + 0, 0); > >> + if (!ep) { > >> + dev_err(dev, "Unable to retrieve endpoint on \"port@4\"\n"); > >> + ret = -ENOENT; > >> + goto err_async; > >> + } > >> + priv->sd.fwnode = ep; > >> + > >> + ret = v4l2_async_register_subdev(&priv->sd); > >> + if (ret < 0) { > >> + dev_err(dev, "Unable to register subdevice\n"); > >> + goto err_put_node; > >> + } > >> + > >> + return 0; > >> + > >> +err_put_node: > >> + fwnode_handle_put(ep); > >> +err_async: > >> + max9286_v4l2_notifier_unregister(priv); > >> + > >> + return ret; > >> +} > >> + > >> +static void max9286_v4l2_unregister(struct max9286_priv *priv) > >> +{ > >> + fwnode_handle_put(priv->sd.fwnode); > >> + v4l2_async_unregister_subdev(&priv->sd); > >> + max9286_v4l2_notifier_unregister(priv); > >> +} > >> + > >> +/* ----------------------------------------------------------------------------- > >> + * Probe/Remove > >> + */ > >> + > >> +static int max9286_setup(struct max9286_priv *priv) > >> +{ > >> + /* > >> + * Link ordering values for all enabled links combinations. Orders must > >> + * be assigned sequentially from 0 to the number of enabled links > >> + * without leaving any hole for disabled links. We thus assign orders to > >> + * enabled links first, and use the remaining order values for disabled > >> + * links are all links must have a different order value; > >> + */ > >> + static const u8 link_order[] = { > >> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxxx */ > >> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxx0 */ > >> + (3 << 6) | (2 << 4) | (0 << 2) | (1 << 0), /* xx0x */ > >> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xx10 */ > >> + (3 << 6) | (0 << 4) | (2 << 2) | (1 << 0), /* x0xx */ > >> + (3 << 6) | (1 << 4) | (2 << 2) | (0 << 0), /* x1x0 */ > >> + (3 << 6) | (1 << 4) | (0 << 2) | (2 << 0), /* x10x */ > >> + (3 << 6) | (1 << 4) | (1 << 2) | (0 << 0), /* x210 */ > >> + (0 << 6) | (3 << 4) | (2 << 2) | (1 << 0), /* 0xxx */ > >> + (1 << 6) | (3 << 4) | (2 << 2) | (0 << 0), /* 1xx0 */ > >> + (1 << 6) | (3 << 4) | (0 << 2) | (2 << 0), /* 1x0x */ > >> + (2 << 6) | (3 << 4) | (1 << 2) | (0 << 0), /* 2x10 */ > >> + (1 << 6) | (0 << 4) | (3 << 2) | (2 << 0), /* 10xx */ > >> + (2 << 6) | (1 << 4) | (3 << 2) | (0 << 0), /* 21x0 */ > >> + (2 << 6) | (1 << 4) | (0 << 2) | (3 << 0), /* 210x */ > >> + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* 3210 */ > >> + }; > >> + > >> + /* > >> + * Set the I2C bus speed. > >> + * > >> + * Enable I2C Local Acknowledge during the probe sequences of the camera > >> + * only. This should be disabled after the mux is initialised. > >> + */ > >> + max9286_configure_i2c(priv, true); > >> + > >> + /* > >> + * Reverse channel setup. > >> + * > >> + * - Enable custom reverse channel configuration (through register 0x3f) > >> + * and set the first pulse length to 35 clock cycles. > >> + * - Increase the reverse channel amplitude to 170mV to accommodate the > >> + * high threshold enabled by the serializer driver. > >> + */ > >> + max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35)); > >> + max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) | > >> + MAX9286_REV_AMP_X); > >> + usleep_range(2000, 2500); > >> + > >> + /* > >> + * Enable GMSL links, mask unused ones and autodetect link > >> + * used as CSI clock source. > >> + */ > >> + max9286_write(priv, 0x00, MAX9286_MSTLINKSEL_AUTO | priv->route_mask); > >> + max9286_write(priv, 0x0b, link_order[priv->route_mask]); > >> + max9286_write(priv, 0x69, (0xf & ~priv->route_mask)); > >> + > >> + /* > >> + * Video format setup: > >> + * Disable CSI output, VC is set according to Link number. > >> + */ > >> + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); > >> + > >> + /* Enable CSI-2 Lane D0-D3 only, DBL mode, YUV422 8-bit. */ > >> + max9286_write(priv, 0x12, MAX9286_CSIDBL | MAX9286_DBL | > >> + MAX9286_CSILANECNT(priv->csi2_data_lanes) | > >> + MAX9286_DATATYPE_YUV422_8BIT); > >> + > >> + /* Automatic: FRAMESYNC taken from the slowest Link. */ > >> + max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ | > >> + MAX9286_FSYNCMETH_AUTO); > >> + > >> + /* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */ > >> + max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS | > >> + MAX9286_HVSRC_D14); > >> + > >> + /* > >> + * The overlap window seems to provide additional validation by tracking > >> + * the delay between vsync and frame sync, generating an error if the > >> + * delay is bigger than the programmed window, though it's not yet clear > >> + * what value should be set. > >> + * > >> + * As it's an optional value and can be disabled, we do so by setting > >> + * a 0 overlap value. > >> + */ > >> + max9286_write(priv, 0x63, 0); > >> + max9286_write(priv, 0x64, 0); > >> + > >> + /* > >> + * Wait for 2ms to allow the link to resynchronize after the > >> + * configuration change. > >> + */ > >> + usleep_range(2000, 5000); > >> + > >> + return 0; > >> +} > >> + > >> +static void max9286_gpio_set(struct gpio_chip *chip, > >> + unsigned int offset, int value) > >> +{ > >> + struct max9286_priv *priv = gpiochip_get_data(chip); > >> + > >> + if (value) > >> + priv->gpio_state |= BIT(offset); > >> + else > >> + priv->gpio_state &= ~BIT(offset); > >> + > >> + max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state); > >> +} > >> + > >> +static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset) > >> +{ > >> + struct max9286_priv *priv = gpiochip_get_data(chip); > >> + > >> + return priv->gpio_state & BIT(offset); > >> +} > >> + > >> +static int max9286_register_gpio(struct max9286_priv *priv) > >> +{ > >> + struct device *dev = &priv->client->dev; > >> + struct gpio_chip *gpio = &priv->gpio; > >> + int ret; > >> + > >> + static const char * const names[] = { > >> + "GPIO0OUT", > >> + "GPIO1OUT", > >> + }; > >> + > >> + /* Configure the GPIO */ > >> + gpio->label = dev_name(dev); > >> + gpio->parent = dev; > >> + gpio->owner = THIS_MODULE; > >> + gpio->of_node = dev->of_node; > >> + gpio->ngpio = 2; > >> + gpio->base = -1; > >> + gpio->set = max9286_gpio_set; > >> + gpio->get = max9286_gpio_get; > >> + gpio->can_sleep = true; > >> + gpio->names = names; > >> + > >> + /* GPIO values default to high */ > >> + priv->gpio_state = BIT(0) | BIT(1); > >> + > >> + ret = devm_gpiochip_add_data(dev, gpio, priv); > >> + if (ret) > >> + dev_err(dev, "Unable to create gpio_chip\n"); > >> + > >> + return ret; > >> +} > >> + > >> +static int max9286_init(struct device *dev) > >> +{ > >> + struct max9286_priv *priv; > >> + struct i2c_client *client; > >> + int ret; > >> + > >> + client = to_i2c_client(dev); > >> + priv = i2c_get_clientdata(client); > >> + > >> + /* Enable the bus power. */ > >> + ret = regulator_enable(priv->regulator); > >> + if (ret < 0) { > >> + dev_err(&client->dev, "Unable to turn PoC on\n"); > >> + return ret; > >> + } > >> + > >> + ret = max9286_setup(priv); > >> + if (ret) { > >> + dev_err(dev, "Unable to setup max9286\n"); > >> + goto err_regulator; > >> + } > >> + > >> + /* > >> + * Register all V4L2 interactions for the MAX9286 and notifiers for > >> + * any subdevices connected. > >> + */ > >> + ret = max9286_v4l2_register(priv); > >> + if (ret) { > >> + dev_err(dev, "Failed to register with V4L2\n"); > >> + goto err_regulator; > >> + } > >> + > >> + ret = max9286_i2c_mux_init(priv); > >> + if (ret) { > >> + dev_err(dev, "Unable to initialize I2C multiplexer\n"); > >> + goto err_v4l2_register; > >> + } > >> + > >> + /* Leave the mux channels disabled until they are selected. */ > >> + max9286_i2c_mux_close(priv); > >> + > >> + return 0; > >> + > >> +err_v4l2_register: > >> + max9286_v4l2_unregister(priv); > >> +err_regulator: > >> + regulator_disable(priv->regulator); > >> + > >> + return ret; > >> +} > >> + > >> +static void max9286_cleanup_dt(struct max9286_priv *priv) > >> +{ > >> + struct max9286_source *source; > >> + > >> + for_each_source(priv, source) { > >> + fwnode_handle_put(source->fwnode); > >> + source->fwnode = NULL; > >> + } > >> +} > >> + > >> +static int max9286_parse_dt(struct max9286_priv *priv) > >> +{ > >> + struct device *dev = &priv->client->dev; > >> + struct device_node *i2c_mux; > >> + struct device_node *node = NULL; > >> + unsigned int i2c_mux_mask = 0; > >> + > >> + of_node_get(dev->of_node); > >> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > >> + if (!i2c_mux) { > >> + dev_err(dev, "Failed to find i2c-mux node\n"); > >> + of_node_put(dev->of_node); > >> + return -EINVAL; > >> + } > >> + > >> + /* Identify which i2c-mux channels are enabled */ > >> + for_each_child_of_node(i2c_mux, node) { > >> + u32 id = 0; > >> + > >> + of_property_read_u32(node, "reg", &id); > >> + if (id >= MAX9286_NUM_GMSL) > >> + continue; > >> + > >> + if (!of_device_is_available(node)) { > >> + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); > >> + continue; > >> + } > >> + > >> + i2c_mux_mask |= BIT(id); > >> + } > >> + of_node_put(node); > >> + of_node_put(i2c_mux); > >> + > >> + /* Parse the endpoints */ > >> + for_each_endpoint_of_node(dev->of_node, node) { > >> + struct max9286_source *source; > >> + struct of_endpoint ep; > >> + > >> + of_graph_parse_endpoint(node, &ep); > >> + dev_dbg(dev, "Endpoint %pOF on port %d", > >> + ep.local_node, ep.port); > >> + > >> + if (ep.port > MAX9286_NUM_GMSL) { > >> + dev_err(dev, "Invalid endpoint %s on port %d", > >> + of_node_full_name(ep.local_node), ep.port); > >> + continue; > >> + } > >> + > >> + /* For the source endpoint just parse the bus configuration. */ > >> + if (ep.port == MAX9286_SRC_PAD) { > >> + struct v4l2_fwnode_endpoint vep = { > >> + .bus_type = V4L2_MBUS_CSI2_DPHY > >> + }; > >> + int ret; > >> + > >> + ret = v4l2_fwnode_endpoint_parse( > >> + of_fwnode_handle(node), &vep); > >> + if (ret) { > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + return ret; > >> + } > >> + > >> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { > >> + dev_err(dev, > >> + "Media bus %u type not supported\n", > >> + vep.bus_type); > >> + v4l2_fwnode_endpoint_free(&vep); > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + return -EINVAL; > >> + } > >> + > >> + priv->csi2_data_lanes = > >> + vep.bus.mipi_csi2.num_data_lanes; > >> + v4l2_fwnode_endpoint_free(&vep); > >> + > >> + continue; > >> + } > >> + > >> + /* Skip if the corresponding GMSL link is unavailable. */ > >> + if (!(i2c_mux_mask & BIT(ep.port))) > >> + continue; > >> + > >> + if (priv->sources[ep.port].fwnode) { > >> + dev_err(dev, > >> + "Multiple port endpoints are not supported: %d", > >> + ep.port); > >> + > >> + continue; > >> + } > >> + > >> + source = &priv->sources[ep.port]; > >> + source->fwnode = fwnode_graph_get_remote_endpoint( > >> + of_fwnode_handle(node)); > >> + if (!source->fwnode) { > >> + dev_err(dev, > >> + "Endpoint %pOF has no remote endpoint connection\n", > >> + ep.local_node); > >> + > >> + continue; > >> + } > >> + > >> + priv->source_mask |= BIT(ep.port); > >> + priv->nsources++; > >> + } > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + > >> + priv->route_mask = priv->source_mask; > >> + > >> + return 0; > >> +} > >> + > >> +static int max9286_probe(struct i2c_client *client) > >> +{ > >> + struct max9286_priv *priv; > >> + int ret; > >> + > >> + priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); > >> + if (!priv) > >> + return -ENOMEM; > >> + > >> + mutex_init(&priv->mutex); > >> + > >> + priv->client = client; > >> + i2c_set_clientdata(client, priv); > >> + > >> + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", > >> + GPIOD_OUT_HIGH); > >> + if (IS_ERR(priv->gpiod_pwdn)) > >> + return PTR_ERR(priv->gpiod_pwdn); > >> + > >> + gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn"); > >> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 1); > >> + > >> + /* Wait at least 4ms before the I2C lines latch to the address */ > >> + if (priv->gpiod_pwdn) > >> + usleep_range(4000, 5000); > >> + > >> + /* > >> + * The MAX9286 starts by default with all ports enabled, we disable all > >> + * ports early to ensure that all channels are disabled if we error out > >> + * and keep the bus consistent. > >> + */ > >> + max9286_i2c_mux_close(priv); > >> + > >> + /* > >> + * The MAX9286 initialises with auto-acknowledge enabled by default. > >> + * This can be invasive to other transactions on the same bus, so > >> + * disable it early. It will be enabled only as and when needed. > >> + */ > >> + max9286_configure_i2c(priv, false); > >> + > >> + ret = max9286_register_gpio(priv); > >> + if (ret) > >> + goto err_powerdown; > >> + > >> + priv->regulator = devm_regulator_get(&client->dev, "poc"); > >> + if (IS_ERR(priv->regulator)) { > >> + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) > >> + dev_err(&client->dev, > >> + "Unable to get PoC regulator (%ld)\n", > >> + PTR_ERR(priv->regulator)); > >> + ret = PTR_ERR(priv->regulator); > >> + goto err_powerdown; > >> + } > >> + > >> + ret = max9286_parse_dt(priv); > >> + if (ret) > >> + goto err_powerdown; > >> + > >> + ret = max9286_init(&client->dev); > >> + if (ret < 0) > >> + goto err_cleanup_dt; > >> + > >> + return 0; > >> + > >> +err_cleanup_dt: > >> + max9286_cleanup_dt(priv); > >> +err_powerdown: > >> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); > >> + > >> + return ret; > >> +} > >> + > >> +static int max9286_remove(struct i2c_client *client) > >> +{ > >> + struct max9286_priv *priv = i2c_get_clientdata(client); > >> + > >> + i2c_mux_del_adapters(priv->mux); > >> + > >> + max9286_v4l2_unregister(priv); > >> + > >> + regulator_disable(priv->regulator); > >> + > >> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); > >> + > >> + max9286_cleanup_dt(priv); > >> + > >> + return 0; > >> +} > >> + > >> +static const struct of_device_id max9286_dt_ids[] = { > >> + { .compatible = "maxim,max9286" }, > >> + {}, > >> +}; > >> +MODULE_DEVICE_TABLE(of, max9286_dt_ids); > >> + > >> +static struct i2c_driver max9286_i2c_driver = { > >> + .driver = { > >> + .name = "max9286", > >> + .of_match_table = of_match_ptr(max9286_dt_ids), > >> + }, > >> + .probe_new = max9286_probe, > >> + .remove = max9286_remove, > >> +}; > >> + > >> +module_i2c_driver(max9286_i2c_driver); > >> + > >> +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); > >> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); > >> +MODULE_LICENSE("GPL"); > >> -- > >> 2.25.1 > >> >
Hi Mani, On 12/05/2020 19:17, Manivannan Sadhasivam wrote: > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: >> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and >> CSI-2 output. The device supports multicamera streaming applications, >> and features the ability to synchronise the attached cameras. >> >> CSI-2 output can be configured with 1 to 4 lanes, and a control channel >> is supported over I2C, which implements an I2C mux to facilitate >> communications with connected cameras across the reverse control >> channel. >> >> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> >> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >> >> -- >> v2: >> - Fix MAINTAINERS entry >> >> This posting is released with the following modifications to work >> without Sakari's VC developments: >> - max9286_g_mbus_config() re-instated >> - max9286_get_frame_desc() is not bus/csi aware >> - max9286_{get,set}_routing() removed >> >> v3: >> - Initialise notifier with v4l2_async_notifier_init >> - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY >> >> v4: - Re-introduce required code to function with the VC series. >> >> - Implement max9286_get_routing, max9286_set_routing >> - Remove max9286_g_mbus_config >> >> v5: (internal release) >> - Fix printk formatting for hex value >> - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) >> - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE >> - Remove 'device is bound' workaround >> >> v6: >> - v4l2_subdev_krouting instead of v4l2_subdev_routing separated >> to allow integration without the VC/V4L2-Mux series. >> - convert sd_to_max9286 to inline function >> - rename max9286_device to max9286_priv >> - Cleanup the v4l2_async_notifier >> - Extend MODULE_AUTHOR >> - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id >> - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) >> - Use new YAML file reference in MAINTAINERS >> - Parse new i2c-mux node in max9286_get_i2c_by_id >> (This could/should be refactored to parse these separately first) >> - Spelling and calculation fixes in the FSYNC_LOCKED check comments >> - Identify each enabled i2c-mux channel in a single pass >> - max9286: Improve mux-state readbility [v2] >> - Fix frame sync lock durations >> - Add comment to describe /why/ we must open the mux in s_stream >> - use -EXDEV as return code for failed link synchronisation. >> - Fix reference counting of the dt nodeS >> - Convert to probe_new for I2C >> - Remove redundant max9286_i2c_mux_state >> - Provide optional enable-gpio (max9286-pwdn) >> >> v7: >> [Kieran] >> - Ensure powerdown lines are optional >> - Add a 4ms power-up delay >> - Add max9286_check_config_link() to core >> - Add GPIO chip controller for GPIO0OUT and GPIO1OUT >> - Fix GPIO registration >> - max9286: Split out async registration >> (fixes regulator -EPROBE_DEFERs failures) >> - Collect all V4L2 registrations >> - balance v4l2_async refcnting >> - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ >> >> [Jacopo] >> - Remove redundanct MAXIM_I2C_SPEED macros >> - Move notifiers operations >> - Add delay after reverse channel reconfiguration >> - Move link setup to completion >> - Fix up max9286_check_config_link() implementation >> - Remove redundant dual configuration of reverse channel >> >> v8: >> >> [Kieran] >> - Update the bound_sources mask on unbind >> - Convert probe kzalloc usage to devm_ variant >> - Fix up cleanup path from GPIO PowerDown registration >> - cleanup GPIO device registration fail path >> - Convert to use devm_regulator_get() >> - Fit max9286_parse_dt print on one line >> - Move multi-device workarounds out of upstream driver >> - Remove I2C mod-table >> - Lock format changes >> - Describe pad index usage >> - Remove poc_enabled workaround >> - Rename the max9286_gpio to be more explicit on it's actions. >> - Move max9286_init_format call >> - Rework probe sequence and simplify error paths. >> - Simplify i2c comments >> - Implement Pixelrate control >> - Disable overlap window >> >> [Jacopo] >> - Adapt Kconfig to latest upstream changes >> - Put of node on error >> - Calculate pixel rate >> - Simplify overlap window disablement >> >> v9: >> >> [Kieran] >> - Kconfig: Depend on OF >> - Re-sort addition to Makefile >> --- >> MAINTAINERS | 10 + >> drivers/media/i2c/Kconfig | 13 + >> drivers/media/i2c/Makefile | 1 + >> drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ >> 4 files changed, 1356 insertions(+) >> create mode 100644 drivers/media/i2c/max9286.c >> >> diff --git a/MAINTAINERS b/MAINTAINERS >> index a7bb6e22d5da..99e3bf7760fd 100644 >> --- a/MAINTAINERS >> +++ b/MAINTAINERS >> @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst >> F: drivers/hwmon/max6697.c >> F: include/linux/platform_data/max6697.h >> >> +MAX9286 QUAD GMSL DESERIALIZER DRIVER >> +M: Jacopo Mondi <jacopo+renesas@jmondi.org> >> +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >> +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >> +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >> +L: linux-media@vger.kernel.org >> +S: Maintained >> +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml >> +F: drivers/media/i2c/max9286.c >> + >> MAX9860 MONO AUDIO VOICE CODEC DRIVER >> M: Peter Rosin <peda@axentia.se> >> L: alsa-devel@alsa-project.org (moderated for non-subscribers) >> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig >> index 3abc80373ec0..2e390f41f6da 100644 >> --- a/drivers/media/i2c/Kconfig >> +++ b/drivers/media/i2c/Kconfig >> @@ -464,6 +464,19 @@ config VIDEO_VPX3220 >> To compile this driver as a module, choose M here: the >> module will be called vpx3220. >> >> +config VIDEO_MAX9286 >> + tristate "Maxim MAX9286 GMSL deserializer support" >> + depends on I2C && I2C_MUX >> + depends on OF >> + select V4L2_FWNODE >> + select VIDEO_V4L2_SUBDEV_API >> + select MEDIA_CONTROLLER >> + help >> + This driver supports the Maxim MAX9286 GMSL deserializer. >> + >> + To compile this driver as a module, choose M here: the >> + module will be called max9286. >> + >> comment "Video and audio decoders" >> >> config VIDEO_SAA717X >> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile >> index 77bf7d0b691f..f0b001ee4b05 100644 >> --- a/drivers/media/i2c/Makefile >> +++ b/drivers/media/i2c/Makefile >> @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o >> obj-$(CONFIG_VIDEO_IMX290) += imx290.o >> obj-$(CONFIG_VIDEO_IMX319) += imx319.o >> obj-$(CONFIG_VIDEO_IMX355) += imx355.o >> +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o >> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o >> >> obj-$(CONFIG_SDR_MAX2175) += max2175.o >> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c >> new file mode 100644 >> index 000000000000..481d65f2b51d >> --- /dev/null >> +++ b/drivers/media/i2c/max9286.c >> @@ -0,0 +1,1332 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * Maxim MAX9286 GMSL Deserializer Driver >> + * >> + * Copyright (C) 2017-2019 Jacopo Mondi >> + * Copyright (C) 2017-2019 Kieran Bingham >> + * Copyright (C) 2017-2019 Laurent Pinchart >> + * Copyright (C) 2017-2019 Niklas Söderlund >> + * Copyright (C) 2016 Renesas Electronics Corporation >> + * Copyright (C) 2015 Cogent Embedded, Inc. >> + */ >> + >> +#include <linux/delay.h> >> +#include <linux/device.h> >> +#include <linux/fwnode.h> >> +#include <linux/gpio/consumer.h> >> +#include <linux/gpio/driver.h> >> +#include <linux/i2c.h> >> +#include <linux/i2c-mux.h> >> +#include <linux/module.h> >> +#include <linux/mutex.h> >> +#include <linux/of_graph.h> >> +#include <linux/regulator/consumer.h> >> +#include <linux/slab.h> >> + >> +#include <media/v4l2-async.h> >> +#include <media/v4l2-ctrls.h> >> +#include <media/v4l2-device.h> >> +#include <media/v4l2-fwnode.h> >> +#include <media/v4l2-subdev.h> >> + >> +/* Register 0x00 */ >> +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) >> +#define MAX9286_MSTLINKSEL(n) ((n) << 5) >> +#define MAX9286_EN_VS_GEN BIT(4) >> +#define MAX9286_LINKEN(n) (1 << (n)) >> +/* Register 0x01 */ >> +#define MAX9286_FSYNCMODE_ECU (3 << 6) >> +#define MAX9286_FSYNCMODE_EXT (2 << 6) >> +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) >> +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) >> +#define MAX9286_GPIEN BIT(5) >> +#define MAX9286_ENLMO_RSTFSYNC BIT(2) >> +#define MAX9286_FSYNCMETH_AUTO (2 << 0) >> +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) >> +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) >> +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 >> +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 >> +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 >> +/* Register 0x0a */ >> +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) >> +#define MAX9286_REVCCEN(n) (1 << (n)) >> +/* Register 0x0c */ >> +#define MAX9286_HVEN BIT(7) >> +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) >> +#define MAX9286_EDC_6BIT_CRC (1 << 5) >> +#define MAX9286_EDC_1BIT_PARITY (0 << 5) >> +#define MAX9286_DESEL BIT(4) >> +#define MAX9286_INVVS BIT(3) >> +#define MAX9286_INVHS BIT(2) >> +#define MAX9286_HVSRC_D0 (2 << 0) >> +#define MAX9286_HVSRC_D14 (1 << 0) >> +#define MAX9286_HVSRC_D18 (0 << 0) >> +/* Register 0x0f */ >> +#define MAX9286_0X0F_RESERVED BIT(3) >> +/* Register 0x12 */ >> +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) >> +#define MAX9286_CSIDBL BIT(5) >> +#define MAX9286_DBL BIT(4) >> +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) >> +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) >> +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) >> +#define MAX9286_DATATYPE_RAW14 (8 << 0) >> +#define MAX9286_DATATYPE_RAW11 (7 << 0) >> +#define MAX9286_DATATYPE_RAW10 (6 << 0) >> +#define MAX9286_DATATYPE_RAW8 (5 << 0) >> +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) >> +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) >> +#define MAX9286_DATATYPE_RGB555 (2 << 0) >> +#define MAX9286_DATATYPE_RGB565 (1 << 0) >> +#define MAX9286_DATATYPE_RGB888 (0 << 0) >> +/* Register 0x15 */ >> +#define MAX9286_VC(n) ((n) << 5) >> +#define MAX9286_VCTYPE BIT(4) >> +#define MAX9286_CSIOUTEN BIT(3) >> +#define MAX9286_0X15_RESV (3 << 0) >> +/* Register 0x1b */ >> +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) >> +#define MAX9286_ENEQ(n) (1 << (n)) >> +/* Register 0x27 */ >> +#define MAX9286_LOCKED BIT(7) >> +/* Register 0x31 */ >> +#define MAX9286_FSYNC_LOCKED BIT(6) >> +/* Register 0x34 */ >> +#define MAX9286_I2CLOCACK BIT(7) >> +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) >> +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) >> +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) >> +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) >> +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) >> +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) >> +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) >> +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) >> +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) >> +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) >> +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) >> +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) >> +#define MAX9286_I2CSLVTO_NONE (3 << 0) >> +#define MAX9286_I2CSLVTO_1024US (2 << 0) >> +#define MAX9286_I2CSLVTO_256US (1 << 0) >> +#define MAX9286_I2CSLVTO_64US (0 << 0) >> +/* Register 0x3b */ >> +#define MAX9286_REV_TRF(n) ((n) << 4) >> +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ >> +#define MAX9286_REV_AMP_X BIT(0) >> +/* Register 0x3f */ >> +#define MAX9286_EN_REV_CFG BIT(6) >> +#define MAX9286_REV_FLEN(n) ((n) - 20) >> +/* Register 0x49 */ >> +#define MAX9286_VIDEO_DETECT_MASK 0x0f >> +/* Register 0x69 */ >> +#define MAX9286_LFLTBMONMASKED BIT(7) >> +#define MAX9286_LOCKMONMASKED BIT(6) >> +#define MAX9286_AUTOCOMBACKEN BIT(5) >> +#define MAX9286_AUTOMASKEN BIT(4) >> +#define MAX9286_MASKLINK(n) ((n) << 0) >> + >> +/* >> + * The sink and source pads are created to match the OF graph port numbers so >> + * that their indexes can be used interchangeably. >> + */ >> +#define MAX9286_NUM_GMSL 4 >> +#define MAX9286_N_SINKS 4 >> +#define MAX9286_N_PADS 5 >> +#define MAX9286_SRC_PAD 4 >> + >> +struct max9286_source { >> + struct v4l2_async_subdev asd; >> + struct v4l2_subdev *sd; >> + struct fwnode_handle *fwnode; >> +}; >> + >> +#define asd_to_max9286_source(_asd) \ >> + container_of(_asd, struct max9286_source, asd) >> + >> +struct max9286_priv { >> + struct i2c_client *client; >> + struct gpio_desc *gpiod_pwdn; >> + struct v4l2_subdev sd; >> + struct media_pad pads[MAX9286_N_PADS]; >> + struct regulator *regulator; >> + >> + struct gpio_chip gpio; >> + u8 gpio_state; >> + >> + struct i2c_mux_core *mux; >> + unsigned int mux_channel; >> + bool mux_open; >> + >> + struct v4l2_ctrl_handler ctrls; >> + struct v4l2_ctrl *pixelrate; >> + >> + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; >> + >> + /* Protects controls and fmt structures */ >> + struct mutex mutex; >> + >> + unsigned int nsources; >> + unsigned int source_mask; >> + unsigned int route_mask; >> + unsigned int bound_sources; >> + unsigned int csi2_data_lanes; >> + struct max9286_source sources[MAX9286_NUM_GMSL]; >> + struct v4l2_async_notifier notifier; >> +}; >> + > > [...] > >> +static int max9286_register_gpio(struct max9286_priv *priv) >> +{ >> + struct device *dev = &priv->client->dev; >> + struct gpio_chip *gpio = &priv->gpio; >> + int ret; >> + >> + static const char * const names[] = { >> + "GPIO0OUT", >> + "GPIO1OUT", >> + }; >> + >> + /* Configure the GPIO */ >> + gpio->label = dev_name(dev); > > So if you have more than one MAX9286 in a system, all gpiochips will appear > with the same name. I'd recommend to append the index to distinguish properly. Ah yes, that's a good point, and I think I've even seen that. I'll fix it now. > >> + gpio->parent = dev; >> + gpio->owner = THIS_MODULE; >> + gpio->of_node = dev->of_node; >> + gpio->ngpio = 2; >> + gpio->base = -1; >> + gpio->set = max9286_gpio_set; >> + gpio->get = max9286_gpio_get; >> + gpio->can_sleep = true; >> + gpio->names = names; >> + >> + /* GPIO values default to high */ >> + priv->gpio_state = BIT(0) | BIT(1); >> + >> + ret = devm_gpiochip_add_data(dev, gpio, priv); >> + if (ret) >> + dev_err(dev, "Unable to create gpio_chip\n"); >> + >> + return ret; >> +} >> + > > [...] > >> +static int max9286_parse_dt(struct max9286_priv *priv) >> +{ >> + struct device *dev = &priv->client->dev; >> + struct device_node *i2c_mux; >> + struct device_node *node = NULL; >> + unsigned int i2c_mux_mask = 0; >> + >> + of_node_get(dev->of_node); > > Why this is needed? Hrm .. I recall adding it to solve dt reference balancing. I wish I'd added a comment at the time ... as I can't recall the details now. >> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); >> + if (!i2c_mux) { >> + dev_err(dev, "Failed to find i2c-mux node\n"); >> + of_node_put(dev->of_node); >> + return -EINVAL; >> + } >> + >> + /* Identify which i2c-mux channels are enabled */ >> + for_each_child_of_node(i2c_mux, node) { >> + u32 id = 0; >> + >> + of_property_read_u32(node, "reg", &id); >> + if (id >= MAX9286_NUM_GMSL) >> + continue; >> + >> + if (!of_device_is_available(node)) { >> + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); >> + continue; >> + } >> + >> + i2c_mux_mask |= BIT(id); >> + } >> + of_node_put(node); >> + of_node_put(i2c_mux); >> + >> + /* Parse the endpoints */ >> + for_each_endpoint_of_node(dev->of_node, node) { >> + struct max9286_source *source; >> + struct of_endpoint ep; >> + >> + of_graph_parse_endpoint(node, &ep); >> + dev_dbg(dev, "Endpoint %pOF on port %d", >> + ep.local_node, ep.port); >> + >> + if (ep.port > MAX9286_NUM_GMSL) { >> + dev_err(dev, "Invalid endpoint %s on port %d", >> + of_node_full_name(ep.local_node), ep.port); >> + continue; >> + } >> + >> + /* For the source endpoint just parse the bus configuration. */ >> + if (ep.port == MAX9286_SRC_PAD) { >> + struct v4l2_fwnode_endpoint vep = { >> + .bus_type = V4L2_MBUS_CSI2_DPHY >> + }; >> + int ret; >> + >> + ret = v4l2_fwnode_endpoint_parse( >> + of_fwnode_handle(node), &vep); >> + if (ret) { >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + return ret; >> + } >> + >> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { >> + dev_err(dev, >> + "Media bus %u type not supported\n", >> + vep.bus_type); >> + v4l2_fwnode_endpoint_free(&vep); >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + return -EINVAL; >> + } >> + >> + priv->csi2_data_lanes = >> + vep.bus.mipi_csi2.num_data_lanes; >> + v4l2_fwnode_endpoint_free(&vep); >> + >> + continue; >> + } >> + >> + /* Skip if the corresponding GMSL link is unavailable. */ >> + if (!(i2c_mux_mask & BIT(ep.port))) >> + continue; >> + >> + if (priv->sources[ep.port].fwnode) { >> + dev_err(dev, >> + "Multiple port endpoints are not supported: %d", >> + ep.port); >> + >> + continue; >> + } >> + >> + source = &priv->sources[ep.port]; >> + source->fwnode = fwnode_graph_get_remote_endpoint( >> + of_fwnode_handle(node)); >> + if (!source->fwnode) { >> + dev_err(dev, >> + "Endpoint %pOF has no remote endpoint connection\n", >> + ep.local_node); >> + >> + continue; >> + } >> + >> + priv->source_mask |= BIT(ep.port); >> + priv->nsources++; >> + } >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + >> + priv->route_mask = priv->source_mask; >> + >> + return 0; >> +} >> + > > [...] > >> +static int max9286_remove(struct i2c_client *client) >> +{ >> + struct max9286_priv *priv = i2c_get_clientdata(client); >> + >> + i2c_mux_del_adapters(priv->mux); >> + >> + max9286_v4l2_unregister(priv); >> + >> + regulator_disable(priv->regulator); >> + >> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); > > Usual power down sequence is to pull the power down gpio low and then turn off > the regulators. This helps in clearing up the internal state machine properly. Do you mean usual, among drivers using regulators? or usual for the max9286? I have a platform which controls the regulators for the cameras (priv->regulator) through one of the GPIOs provided by the MAX9286. If we powerdown the max9286 first, then we will not be able to change the GPIO value on the gpio controlled regulator. (Currently it doesn't expose as a gpio regulator, but just a gpio-hog - but thats a different matter) -- Kieran > > Thanks, > Mani > >> + >> + max9286_cleanup_dt(priv); >> + >> + return 0; >> +} >> + >> +static const struct of_device_id max9286_dt_ids[] = { >> + { .compatible = "maxim,max9286" }, >> + {}, >> +}; >> +MODULE_DEVICE_TABLE(of, max9286_dt_ids); >> + >> +static struct i2c_driver max9286_i2c_driver = { >> + .driver = { >> + .name = "max9286", >> + .of_match_table = of_match_ptr(max9286_dt_ids), >> + }, >> + .probe_new = max9286_probe, >> + .remove = max9286_remove, >> +}; >> + >> +module_i2c_driver(max9286_i2c_driver); >> + >> +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); >> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); >> +MODULE_LICENSE("GPL"); >> -- >> 2.25.1 >>
Hi Mani, On 14/05/2020 10:59, Manivannan Sadhasivam wrote: > On Thu, May 14, 2020 at 10:53:00AM +0100, Kieran Bingham wrote: >> Hi Mani, >>>> +static int max9286_set_fmt(struct v4l2_subdev *sd, >>>> + struct v4l2_subdev_pad_config *cfg, >>>> + struct v4l2_subdev_format *format) >>>> +{ >>>> + struct max9286_priv *priv = sd_to_max9286(sd); >>>> + struct v4l2_mbus_framefmt *cfg_fmt; >>>> + >>>> + if (format->pad >= MAX9286_SRC_PAD) >>>> + return -EINVAL; >>>> + >>>> + /* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */ >>>> + switch (format->format.code) { >>>> + case MEDIA_BUS_FMT_UYVY8_2X8: >>>> + case MEDIA_BUS_FMT_VYUY8_2X8: >>>> + case MEDIA_BUS_FMT_YUYV8_2X8: >>>> + case MEDIA_BUS_FMT_YVYU8_2X8: >>>> + break; >>>> + default: >>>> + format->format.code = MEDIA_BUS_FMT_YUYV8_2X8; >>> >>> Is there any reason for not setting default format to MEDIA_BUS_FMT_UYVY8_2X8? >>> >> >> >> No good reason no, and I see that in max9286_enum_mbus_code(), we >> currently code to MEDIA_BUS_FMT_YUYV8_2X8, and that's the value that we >> init to, so that would be a better default indeed. >> > > max9286_enum_mbus_code() returns MEDIA_BUS_FMT_UYVY8_2X8, no? Argh, sorry - yet anther typo or copy/paste error. Indeed, I have changed this locally to ... <double checks> MEDIA_BUS_FMT_UYVY8_2X8 </double checks> as suggested. ;-) > > Thanks, > Mani
Hi Kieran, On Thu, May 14, 2020 at 11:02:53AM +0100, Kieran Bingham wrote: > Hi Mani, > > On 12/05/2020 19:17, Manivannan Sadhasivam wrote: > > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > >> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and > >> CSI-2 output. The device supports multicamera streaming applications, > >> and features the ability to synchronise the attached cameras. > >> > >> CSI-2 output can be configured with 1 to 4 lanes, and a control channel > >> is supported over I2C, which implements an I2C mux to facilitate > >> communications with connected cameras across the reverse control > >> channel. > >> > >> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> > >> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > >> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > >> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > >> > >> -- > >> v2: > >> - Fix MAINTAINERS entry > >> > >> This posting is released with the following modifications to work > >> without Sakari's VC developments: > >> - max9286_g_mbus_config() re-instated > >> - max9286_get_frame_desc() is not bus/csi aware > >> - max9286_{get,set}_routing() removed > >> > >> v3: > >> - Initialise notifier with v4l2_async_notifier_init > >> - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY > >> > >> v4: - Re-introduce required code to function with the VC series. > >> > >> - Implement max9286_get_routing, max9286_set_routing > >> - Remove max9286_g_mbus_config > >> > >> v5: (internal release) > >> - Fix printk formatting for hex value > >> - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) > >> - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE > >> - Remove 'device is bound' workaround > >> > >> v6: > >> - v4l2_subdev_krouting instead of v4l2_subdev_routing separated > >> to allow integration without the VC/V4L2-Mux series. > >> - convert sd_to_max9286 to inline function > >> - rename max9286_device to max9286_priv > >> - Cleanup the v4l2_async_notifier > >> - Extend MODULE_AUTHOR > >> - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id > >> - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) > >> - Use new YAML file reference in MAINTAINERS > >> - Parse new i2c-mux node in max9286_get_i2c_by_id > >> (This could/should be refactored to parse these separately first) > >> - Spelling and calculation fixes in the FSYNC_LOCKED check comments > >> - Identify each enabled i2c-mux channel in a single pass > >> - max9286: Improve mux-state readbility [v2] > >> - Fix frame sync lock durations > >> - Add comment to describe /why/ we must open the mux in s_stream > >> - use -EXDEV as return code for failed link synchronisation. > >> - Fix reference counting of the dt nodeS > >> - Convert to probe_new for I2C > >> - Remove redundant max9286_i2c_mux_state > >> - Provide optional enable-gpio (max9286-pwdn) > >> > >> v7: > >> [Kieran] > >> - Ensure powerdown lines are optional > >> - Add a 4ms power-up delay > >> - Add max9286_check_config_link() to core > >> - Add GPIO chip controller for GPIO0OUT and GPIO1OUT > >> - Fix GPIO registration > >> - max9286: Split out async registration > >> (fixes regulator -EPROBE_DEFERs failures) > >> - Collect all V4L2 registrations > >> - balance v4l2_async refcnting > >> - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ > >> > >> [Jacopo] > >> - Remove redundanct MAXIM_I2C_SPEED macros > >> - Move notifiers operations > >> - Add delay after reverse channel reconfiguration > >> - Move link setup to completion > >> - Fix up max9286_check_config_link() implementation > >> - Remove redundant dual configuration of reverse channel > >> > >> v8: > >> > >> [Kieran] > >> - Update the bound_sources mask on unbind > >> - Convert probe kzalloc usage to devm_ variant > >> - Fix up cleanup path from GPIO PowerDown registration > >> - cleanup GPIO device registration fail path > >> - Convert to use devm_regulator_get() > >> - Fit max9286_parse_dt print on one line > >> - Move multi-device workarounds out of upstream driver > >> - Remove I2C mod-table > >> - Lock format changes > >> - Describe pad index usage > >> - Remove poc_enabled workaround > >> - Rename the max9286_gpio to be more explicit on it's actions. > >> - Move max9286_init_format call > >> - Rework probe sequence and simplify error paths. > >> - Simplify i2c comments > >> - Implement Pixelrate control > >> - Disable overlap window > >> > >> [Jacopo] > >> - Adapt Kconfig to latest upstream changes > >> - Put of node on error > >> - Calculate pixel rate > >> - Simplify overlap window disablement > >> > >> v9: > >> > >> [Kieran] > >> - Kconfig: Depend on OF > >> - Re-sort addition to Makefile > >> --- > >> MAINTAINERS | 10 + > >> drivers/media/i2c/Kconfig | 13 + > >> drivers/media/i2c/Makefile | 1 + > >> drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ > >> 4 files changed, 1356 insertions(+) > >> create mode 100644 drivers/media/i2c/max9286.c > >> > >> diff --git a/MAINTAINERS b/MAINTAINERS > >> index a7bb6e22d5da..99e3bf7760fd 100644 > >> --- a/MAINTAINERS > >> +++ b/MAINTAINERS > >> @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst > >> F: drivers/hwmon/max6697.c > >> F: include/linux/platform_data/max6697.h > >> > >> +MAX9286 QUAD GMSL DESERIALIZER DRIVER > >> +M: Jacopo Mondi <jacopo+renesas@jmondi.org> > >> +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > >> +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > >> +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > >> +L: linux-media@vger.kernel.org > >> +S: Maintained > >> +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml > >> +F: drivers/media/i2c/max9286.c > >> + > >> MAX9860 MONO AUDIO VOICE CODEC DRIVER > >> M: Peter Rosin <peda@axentia.se> > >> L: alsa-devel@alsa-project.org (moderated for non-subscribers) > >> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig > >> index 3abc80373ec0..2e390f41f6da 100644 > >> --- a/drivers/media/i2c/Kconfig > >> +++ b/drivers/media/i2c/Kconfig > >> @@ -464,6 +464,19 @@ config VIDEO_VPX3220 > >> To compile this driver as a module, choose M here: the > >> module will be called vpx3220. > >> > >> +config VIDEO_MAX9286 > >> + tristate "Maxim MAX9286 GMSL deserializer support" > >> + depends on I2C && I2C_MUX > >> + depends on OF > >> + select V4L2_FWNODE > >> + select VIDEO_V4L2_SUBDEV_API > >> + select MEDIA_CONTROLLER > >> + help > >> + This driver supports the Maxim MAX9286 GMSL deserializer. > >> + > >> + To compile this driver as a module, choose M here: the > >> + module will be called max9286. > >> + > >> comment "Video and audio decoders" > >> > >> config VIDEO_SAA717X > >> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile > >> index 77bf7d0b691f..f0b001ee4b05 100644 > >> --- a/drivers/media/i2c/Makefile > >> +++ b/drivers/media/i2c/Makefile > >> @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o > >> obj-$(CONFIG_VIDEO_IMX290) += imx290.o > >> obj-$(CONFIG_VIDEO_IMX319) += imx319.o > >> obj-$(CONFIG_VIDEO_IMX355) += imx355.o > >> +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o > >> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o > >> > >> obj-$(CONFIG_SDR_MAX2175) += max2175.o > >> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c > >> new file mode 100644 > >> index 000000000000..481d65f2b51d > >> --- /dev/null > >> +++ b/drivers/media/i2c/max9286.c > >> @@ -0,0 +1,1332 @@ > >> +// SPDX-License-Identifier: GPL-2.0+ > >> +/* > >> + * Maxim MAX9286 GMSL Deserializer Driver > >> + * > >> + * Copyright (C) 2017-2019 Jacopo Mondi > >> + * Copyright (C) 2017-2019 Kieran Bingham > >> + * Copyright (C) 2017-2019 Laurent Pinchart > >> + * Copyright (C) 2017-2019 Niklas Söderlund > >> + * Copyright (C) 2016 Renesas Electronics Corporation > >> + * Copyright (C) 2015 Cogent Embedded, Inc. > >> + */ > >> + > >> +#include <linux/delay.h> > >> +#include <linux/device.h> > >> +#include <linux/fwnode.h> > >> +#include <linux/gpio/consumer.h> > >> +#include <linux/gpio/driver.h> > >> +#include <linux/i2c.h> > >> +#include <linux/i2c-mux.h> > >> +#include <linux/module.h> > >> +#include <linux/mutex.h> > >> +#include <linux/of_graph.h> > >> +#include <linux/regulator/consumer.h> > >> +#include <linux/slab.h> > >> + > >> +#include <media/v4l2-async.h> > >> +#include <media/v4l2-ctrls.h> > >> +#include <media/v4l2-device.h> > >> +#include <media/v4l2-fwnode.h> > >> +#include <media/v4l2-subdev.h> > >> + > >> +/* Register 0x00 */ > >> +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) > >> +#define MAX9286_MSTLINKSEL(n) ((n) << 5) > >> +#define MAX9286_EN_VS_GEN BIT(4) > >> +#define MAX9286_LINKEN(n) (1 << (n)) > >> +/* Register 0x01 */ > >> +#define MAX9286_FSYNCMODE_ECU (3 << 6) > >> +#define MAX9286_FSYNCMODE_EXT (2 << 6) > >> +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) > >> +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) > >> +#define MAX9286_GPIEN BIT(5) > >> +#define MAX9286_ENLMO_RSTFSYNC BIT(2) > >> +#define MAX9286_FSYNCMETH_AUTO (2 << 0) > >> +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) > >> +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) > >> +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 > >> +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 > >> +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 > >> +/* Register 0x0a */ > >> +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) > >> +#define MAX9286_REVCCEN(n) (1 << (n)) > >> +/* Register 0x0c */ > >> +#define MAX9286_HVEN BIT(7) > >> +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) > >> +#define MAX9286_EDC_6BIT_CRC (1 << 5) > >> +#define MAX9286_EDC_1BIT_PARITY (0 << 5) > >> +#define MAX9286_DESEL BIT(4) > >> +#define MAX9286_INVVS BIT(3) > >> +#define MAX9286_INVHS BIT(2) > >> +#define MAX9286_HVSRC_D0 (2 << 0) > >> +#define MAX9286_HVSRC_D14 (1 << 0) > >> +#define MAX9286_HVSRC_D18 (0 << 0) > >> +/* Register 0x0f */ > >> +#define MAX9286_0X0F_RESERVED BIT(3) > >> +/* Register 0x12 */ > >> +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) > >> +#define MAX9286_CSIDBL BIT(5) > >> +#define MAX9286_DBL BIT(4) > >> +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) > >> +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) > >> +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) > >> +#define MAX9286_DATATYPE_RAW14 (8 << 0) > >> +#define MAX9286_DATATYPE_RAW11 (7 << 0) > >> +#define MAX9286_DATATYPE_RAW10 (6 << 0) > >> +#define MAX9286_DATATYPE_RAW8 (5 << 0) > >> +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) > >> +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) > >> +#define MAX9286_DATATYPE_RGB555 (2 << 0) > >> +#define MAX9286_DATATYPE_RGB565 (1 << 0) > >> +#define MAX9286_DATATYPE_RGB888 (0 << 0) > >> +/* Register 0x15 */ > >> +#define MAX9286_VC(n) ((n) << 5) > >> +#define MAX9286_VCTYPE BIT(4) > >> +#define MAX9286_CSIOUTEN BIT(3) > >> +#define MAX9286_0X15_RESV (3 << 0) > >> +/* Register 0x1b */ > >> +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) > >> +#define MAX9286_ENEQ(n) (1 << (n)) > >> +/* Register 0x27 */ > >> +#define MAX9286_LOCKED BIT(7) > >> +/* Register 0x31 */ > >> +#define MAX9286_FSYNC_LOCKED BIT(6) > >> +/* Register 0x34 */ > >> +#define MAX9286_I2CLOCACK BIT(7) > >> +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) > >> +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) > >> +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) > >> +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) > >> +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) > >> +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) > >> +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) > >> +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) > >> +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) > >> +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) > >> +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) > >> +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) > >> +#define MAX9286_I2CSLVTO_NONE (3 << 0) > >> +#define MAX9286_I2CSLVTO_1024US (2 << 0) > >> +#define MAX9286_I2CSLVTO_256US (1 << 0) > >> +#define MAX9286_I2CSLVTO_64US (0 << 0) > >> +/* Register 0x3b */ > >> +#define MAX9286_REV_TRF(n) ((n) << 4) > >> +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ > >> +#define MAX9286_REV_AMP_X BIT(0) > >> +/* Register 0x3f */ > >> +#define MAX9286_EN_REV_CFG BIT(6) > >> +#define MAX9286_REV_FLEN(n) ((n) - 20) > >> +/* Register 0x49 */ > >> +#define MAX9286_VIDEO_DETECT_MASK 0x0f > >> +/* Register 0x69 */ > >> +#define MAX9286_LFLTBMONMASKED BIT(7) > >> +#define MAX9286_LOCKMONMASKED BIT(6) > >> +#define MAX9286_AUTOCOMBACKEN BIT(5) > >> +#define MAX9286_AUTOMASKEN BIT(4) > >> +#define MAX9286_MASKLINK(n) ((n) << 0) > >> + > >> +/* > >> + * The sink and source pads are created to match the OF graph port numbers so > >> + * that their indexes can be used interchangeably. > >> + */ > >> +#define MAX9286_NUM_GMSL 4 > >> +#define MAX9286_N_SINKS 4 > >> +#define MAX9286_N_PADS 5 > >> +#define MAX9286_SRC_PAD 4 > >> + > >> +struct max9286_source { > >> + struct v4l2_async_subdev asd; > >> + struct v4l2_subdev *sd; > >> + struct fwnode_handle *fwnode; > >> +}; > >> + > >> +#define asd_to_max9286_source(_asd) \ > >> + container_of(_asd, struct max9286_source, asd) > >> + > >> +struct max9286_priv { > >> + struct i2c_client *client; > >> + struct gpio_desc *gpiod_pwdn; > >> + struct v4l2_subdev sd; > >> + struct media_pad pads[MAX9286_N_PADS]; > >> + struct regulator *regulator; > >> + > >> + struct gpio_chip gpio; > >> + u8 gpio_state; > >> + > >> + struct i2c_mux_core *mux; > >> + unsigned int mux_channel; > >> + bool mux_open; > >> + > >> + struct v4l2_ctrl_handler ctrls; > >> + struct v4l2_ctrl *pixelrate; > >> + > >> + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; > >> + > >> + /* Protects controls and fmt structures */ > >> + struct mutex mutex; > >> + > >> + unsigned int nsources; > >> + unsigned int source_mask; > >> + unsigned int route_mask; > >> + unsigned int bound_sources; > >> + unsigned int csi2_data_lanes; > >> + struct max9286_source sources[MAX9286_NUM_GMSL]; > >> + struct v4l2_async_notifier notifier; > >> +}; > >> + > > > > [...] > > > >> +static int max9286_register_gpio(struct max9286_priv *priv) > >> +{ > >> + struct device *dev = &priv->client->dev; > >> + struct gpio_chip *gpio = &priv->gpio; > >> + int ret; > >> + > >> + static const char * const names[] = { > >> + "GPIO0OUT", > >> + "GPIO1OUT", > >> + }; > >> + > >> + /* Configure the GPIO */ > >> + gpio->label = dev_name(dev); > > > > So if you have more than one MAX9286 in a system, all gpiochips will appear > > with the same name. I'd recommend to append the index to distinguish properly. > > Ah yes, that's a good point, and I think I've even seen that. > > I'll fix it now. > > > > >> + gpio->parent = dev; > >> + gpio->owner = THIS_MODULE; > >> + gpio->of_node = dev->of_node; > >> + gpio->ngpio = 2; > >> + gpio->base = -1; > >> + gpio->set = max9286_gpio_set; > >> + gpio->get = max9286_gpio_get; > >> + gpio->can_sleep = true; > >> + gpio->names = names; > >> + > >> + /* GPIO values default to high */ > >> + priv->gpio_state = BIT(0) | BIT(1); > >> + > >> + ret = devm_gpiochip_add_data(dev, gpio, priv); > >> + if (ret) > >> + dev_err(dev, "Unable to create gpio_chip\n"); > >> + > >> + return ret; > >> +} > >> + > > > > [...] > > > >> +static int max9286_parse_dt(struct max9286_priv *priv) > >> +{ > >> + struct device *dev = &priv->client->dev; > >> + struct device_node *i2c_mux; > >> + struct device_node *node = NULL; > >> + unsigned int i2c_mux_mask = 0; > >> + > >> + of_node_get(dev->of_node); > > > > Why this is needed? > > Hrm .. I recall adding it to solve dt reference balancing. > > I wish I'd added a comment at the time ... as I can't recall the details > now. > I understand that it is for the refcount balancing but I certainly don't see a need for it. > >> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > >> + if (!i2c_mux) { > >> + dev_err(dev, "Failed to find i2c-mux node\n"); > >> + of_node_put(dev->of_node); > >> + return -EINVAL; > >> + } > >> + [...] > > > > [...] > > > >> +static int max9286_remove(struct i2c_client *client) > >> +{ > >> + struct max9286_priv *priv = i2c_get_clientdata(client); > >> + > >> + i2c_mux_del_adapters(priv->mux); > >> + > >> + max9286_v4l2_unregister(priv); > >> + > >> + regulator_disable(priv->regulator); > >> + > >> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); > > > > Usual power down sequence is to pull the power down gpio low and then turn off > > the regulators. This helps in clearing up the internal state machine properly. > > Do you mean usual, among drivers using regulators? or usual for the max9286? > Usual for devices exposing shutdown gpios and powered by an external regulator. > I have a platform which controls the regulators for the cameras > (priv->regulator) through one of the GPIOs provided by the MAX9286. > > If we powerdown the max9286 first, then we will not be able to change > the GPIO value on the gpio controlled regulator. > Hmm, I didn't think of this usecase. Let's keep it as it is. Thanks, Mani > (Currently it doesn't expose as a gpio regulator, but just a gpio-hog - > but thats a different matter) > > -- > Kieran > > > > > > Thanks, > > Mani > > > >> + > >> + max9286_cleanup_dt(priv); > >> + > >> + return 0; > >> +} > >> + > >> +static const struct of_device_id max9286_dt_ids[] = { > >> + { .compatible = "maxim,max9286" }, > >> + {}, > >> +}; > >> +MODULE_DEVICE_TABLE(of, max9286_dt_ids); > >> + > >> +static struct i2c_driver max9286_i2c_driver = { > >> + .driver = { > >> + .name = "max9286", > >> + .of_match_table = of_match_ptr(max9286_dt_ids), > >> + }, > >> + .probe_new = max9286_probe, > >> + .remove = max9286_remove, > >> +}; > >> + > >> +module_i2c_driver(max9286_i2c_driver); > >> + > >> +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); > >> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); > >> +MODULE_LICENSE("GPL"); > >> -- > >> 2.25.1 > >> >
Hi Mani, On 14/05/2020 11:13, Manivannan Sadhasivam wrote: > Hi Kieran, > > On Thu, May 14, 2020 at 11:02:53AM +0100, Kieran Bingham wrote: >> Hi Mani, >> >> On 12/05/2020 19:17, Manivannan Sadhasivam wrote: >>> On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: >>>> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and >>>> CSI-2 output. The device supports multicamera streaming applications, >>>> and features the ability to synchronise the attached cameras. >>>> >>>> CSI-2 output can be configured with 1 to 4 lanes, and a control channel >>>> is supported over I2C, which implements an I2C mux to facilitate >>>> communications with connected cameras across the reverse control >>>> channel. >>>> >>>> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> >>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >>>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >>>> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >>>> >>>> -- >>>> v2: >>>> - Fix MAINTAINERS entry >>>> >>>> This posting is released with the following modifications to work >>>> without Sakari's VC developments: >>>> - max9286_g_mbus_config() re-instated >>>> - max9286_get_frame_desc() is not bus/csi aware >>>> - max9286_{get,set}_routing() removed >>>> >>>> v3: >>>> - Initialise notifier with v4l2_async_notifier_init >>>> - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY >>>> >>>> v4: - Re-introduce required code to function with the VC series. >>>> >>>> - Implement max9286_get_routing, max9286_set_routing >>>> - Remove max9286_g_mbus_config >>>> >>>> v5: (internal release) >>>> - Fix printk formatting for hex value >>>> - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) >>>> - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE >>>> - Remove 'device is bound' workaround >>>> >>>> v6: >>>> - v4l2_subdev_krouting instead of v4l2_subdev_routing separated >>>> to allow integration without the VC/V4L2-Mux series. >>>> - convert sd_to_max9286 to inline function >>>> - rename max9286_device to max9286_priv >>>> - Cleanup the v4l2_async_notifier >>>> - Extend MODULE_AUTHOR >>>> - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id >>>> - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) >>>> - Use new YAML file reference in MAINTAINERS >>>> - Parse new i2c-mux node in max9286_get_i2c_by_id >>>> (This could/should be refactored to parse these separately first) >>>> - Spelling and calculation fixes in the FSYNC_LOCKED check comments >>>> - Identify each enabled i2c-mux channel in a single pass >>>> - max9286: Improve mux-state readbility [v2] >>>> - Fix frame sync lock durations >>>> - Add comment to describe /why/ we must open the mux in s_stream >>>> - use -EXDEV as return code for failed link synchronisation. >>>> - Fix reference counting of the dt nodeS >>>> - Convert to probe_new for I2C >>>> - Remove redundant max9286_i2c_mux_state >>>> - Provide optional enable-gpio (max9286-pwdn) >>>> >>>> v7: >>>> [Kieran] >>>> - Ensure powerdown lines are optional >>>> - Add a 4ms power-up delay >>>> - Add max9286_check_config_link() to core >>>> - Add GPIO chip controller for GPIO0OUT and GPIO1OUT >>>> - Fix GPIO registration >>>> - max9286: Split out async registration >>>> (fixes regulator -EPROBE_DEFERs failures) >>>> - Collect all V4L2 registrations >>>> - balance v4l2_async refcnting >>>> - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ >>>> >>>> [Jacopo] >>>> - Remove redundanct MAXIM_I2C_SPEED macros >>>> - Move notifiers operations >>>> - Add delay after reverse channel reconfiguration >>>> - Move link setup to completion >>>> - Fix up max9286_check_config_link() implementation >>>> - Remove redundant dual configuration of reverse channel >>>> >>>> v8: >>>> >>>> [Kieran] >>>> - Update the bound_sources mask on unbind >>>> - Convert probe kzalloc usage to devm_ variant >>>> - Fix up cleanup path from GPIO PowerDown registration >>>> - cleanup GPIO device registration fail path >>>> - Convert to use devm_regulator_get() >>>> - Fit max9286_parse_dt print on one line >>>> - Move multi-device workarounds out of upstream driver >>>> - Remove I2C mod-table >>>> - Lock format changes >>>> - Describe pad index usage >>>> - Remove poc_enabled workaround >>>> - Rename the max9286_gpio to be more explicit on it's actions. >>>> - Move max9286_init_format call >>>> - Rework probe sequence and simplify error paths. >>>> - Simplify i2c comments >>>> - Implement Pixelrate control >>>> - Disable overlap window >>>> >>>> [Jacopo] >>>> - Adapt Kconfig to latest upstream changes >>>> - Put of node on error >>>> - Calculate pixel rate >>>> - Simplify overlap window disablement >>>> >>>> v9: >>>> >>>> [Kieran] >>>> - Kconfig: Depend on OF >>>> - Re-sort addition to Makefile >>>> --- >>>> MAINTAINERS | 10 + >>>> drivers/media/i2c/Kconfig | 13 + >>>> drivers/media/i2c/Makefile | 1 + >>>> drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ >>>> 4 files changed, 1356 insertions(+) >>>> create mode 100644 drivers/media/i2c/max9286.c >>>> >>>> diff --git a/MAINTAINERS b/MAINTAINERS >>>> index a7bb6e22d5da..99e3bf7760fd 100644 >>>> --- a/MAINTAINERS >>>> +++ b/MAINTAINERS >>>> @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst >>>> F: drivers/hwmon/max6697.c >>>> F: include/linux/platform_data/max6697.h >>>> >>>> +MAX9286 QUAD GMSL DESERIALIZER DRIVER >>>> +M: Jacopo Mondi <jacopo+renesas@jmondi.org> >>>> +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >>>> +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >>>> +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >>>> +L: linux-media@vger.kernel.org >>>> +S: Maintained >>>> +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml >>>> +F: drivers/media/i2c/max9286.c >>>> + >>>> MAX9860 MONO AUDIO VOICE CODEC DRIVER >>>> M: Peter Rosin <peda@axentia.se> >>>> L: alsa-devel@alsa-project.org (moderated for non-subscribers) >>>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig >>>> index 3abc80373ec0..2e390f41f6da 100644 >>>> --- a/drivers/media/i2c/Kconfig >>>> +++ b/drivers/media/i2c/Kconfig >>>> @@ -464,6 +464,19 @@ config VIDEO_VPX3220 >>>> To compile this driver as a module, choose M here: the >>>> module will be called vpx3220. >>>> >>>> +config VIDEO_MAX9286 >>>> + tristate "Maxim MAX9286 GMSL deserializer support" >>>> + depends on I2C && I2C_MUX >>>> + depends on OF >>>> + select V4L2_FWNODE >>>> + select VIDEO_V4L2_SUBDEV_API >>>> + select MEDIA_CONTROLLER >>>> + help >>>> + This driver supports the Maxim MAX9286 GMSL deserializer. >>>> + >>>> + To compile this driver as a module, choose M here: the >>>> + module will be called max9286. >>>> + >>>> comment "Video and audio decoders" >>>> >>>> config VIDEO_SAA717X >>>> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile >>>> index 77bf7d0b691f..f0b001ee4b05 100644 >>>> --- a/drivers/media/i2c/Makefile >>>> +++ b/drivers/media/i2c/Makefile >>>> @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o >>>> obj-$(CONFIG_VIDEO_IMX290) += imx290.o >>>> obj-$(CONFIG_VIDEO_IMX319) += imx319.o >>>> obj-$(CONFIG_VIDEO_IMX355) += imx355.o >>>> +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o >>>> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o >>>> >>>> obj-$(CONFIG_SDR_MAX2175) += max2175.o >>>> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c >>>> new file mode 100644 >>>> index 000000000000..481d65f2b51d >>>> --- /dev/null >>>> +++ b/drivers/media/i2c/max9286.c >>>> @@ -0,0 +1,1332 @@ >>>> +// SPDX-License-Identifier: GPL-2.0+ >>>> +/* >>>> + * Maxim MAX9286 GMSL Deserializer Driver >>>> + * >>>> + * Copyright (C) 2017-2019 Jacopo Mondi >>>> + * Copyright (C) 2017-2019 Kieran Bingham >>>> + * Copyright (C) 2017-2019 Laurent Pinchart >>>> + * Copyright (C) 2017-2019 Niklas Söderlund >>>> + * Copyright (C) 2016 Renesas Electronics Corporation >>>> + * Copyright (C) 2015 Cogent Embedded, Inc. >>>> + */ >>>> + >>>> +#include <linux/delay.h> >>>> +#include <linux/device.h> >>>> +#include <linux/fwnode.h> >>>> +#include <linux/gpio/consumer.h> >>>> +#include <linux/gpio/driver.h> >>>> +#include <linux/i2c.h> >>>> +#include <linux/i2c-mux.h> >>>> +#include <linux/module.h> >>>> +#include <linux/mutex.h> >>>> +#include <linux/of_graph.h> >>>> +#include <linux/regulator/consumer.h> >>>> +#include <linux/slab.h> >>>> + >>>> +#include <media/v4l2-async.h> >>>> +#include <media/v4l2-ctrls.h> >>>> +#include <media/v4l2-device.h> >>>> +#include <media/v4l2-fwnode.h> >>>> +#include <media/v4l2-subdev.h> >>>> + >>>> +/* Register 0x00 */ >>>> +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) >>>> +#define MAX9286_MSTLINKSEL(n) ((n) << 5) >>>> +#define MAX9286_EN_VS_GEN BIT(4) >>>> +#define MAX9286_LINKEN(n) (1 << (n)) >>>> +/* Register 0x01 */ >>>> +#define MAX9286_FSYNCMODE_ECU (3 << 6) >>>> +#define MAX9286_FSYNCMODE_EXT (2 << 6) >>>> +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) >>>> +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) >>>> +#define MAX9286_GPIEN BIT(5) >>>> +#define MAX9286_ENLMO_RSTFSYNC BIT(2) >>>> +#define MAX9286_FSYNCMETH_AUTO (2 << 0) >>>> +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) >>>> +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) >>>> +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 >>>> +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 >>>> +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 >>>> +/* Register 0x0a */ >>>> +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) >>>> +#define MAX9286_REVCCEN(n) (1 << (n)) >>>> +/* Register 0x0c */ >>>> +#define MAX9286_HVEN BIT(7) >>>> +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) >>>> +#define MAX9286_EDC_6BIT_CRC (1 << 5) >>>> +#define MAX9286_EDC_1BIT_PARITY (0 << 5) >>>> +#define MAX9286_DESEL BIT(4) >>>> +#define MAX9286_INVVS BIT(3) >>>> +#define MAX9286_INVHS BIT(2) >>>> +#define MAX9286_HVSRC_D0 (2 << 0) >>>> +#define MAX9286_HVSRC_D14 (1 << 0) >>>> +#define MAX9286_HVSRC_D18 (0 << 0) >>>> +/* Register 0x0f */ >>>> +#define MAX9286_0X0F_RESERVED BIT(3) >>>> +/* Register 0x12 */ >>>> +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) >>>> +#define MAX9286_CSIDBL BIT(5) >>>> +#define MAX9286_DBL BIT(4) >>>> +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) >>>> +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) >>>> +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) >>>> +#define MAX9286_DATATYPE_RAW14 (8 << 0) >>>> +#define MAX9286_DATATYPE_RAW11 (7 << 0) >>>> +#define MAX9286_DATATYPE_RAW10 (6 << 0) >>>> +#define MAX9286_DATATYPE_RAW8 (5 << 0) >>>> +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) >>>> +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) >>>> +#define MAX9286_DATATYPE_RGB555 (2 << 0) >>>> +#define MAX9286_DATATYPE_RGB565 (1 << 0) >>>> +#define MAX9286_DATATYPE_RGB888 (0 << 0) >>>> +/* Register 0x15 */ >>>> +#define MAX9286_VC(n) ((n) << 5) >>>> +#define MAX9286_VCTYPE BIT(4) >>>> +#define MAX9286_CSIOUTEN BIT(3) >>>> +#define MAX9286_0X15_RESV (3 << 0) >>>> +/* Register 0x1b */ >>>> +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) >>>> +#define MAX9286_ENEQ(n) (1 << (n)) >>>> +/* Register 0x27 */ >>>> +#define MAX9286_LOCKED BIT(7) >>>> +/* Register 0x31 */ >>>> +#define MAX9286_FSYNC_LOCKED BIT(6) >>>> +/* Register 0x34 */ >>>> +#define MAX9286_I2CLOCACK BIT(7) >>>> +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) >>>> +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) >>>> +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) >>>> +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) >>>> +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) >>>> +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) >>>> +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) >>>> +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) >>>> +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) >>>> +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) >>>> +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) >>>> +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) >>>> +#define MAX9286_I2CSLVTO_NONE (3 << 0) >>>> +#define MAX9286_I2CSLVTO_1024US (2 << 0) >>>> +#define MAX9286_I2CSLVTO_256US (1 << 0) >>>> +#define MAX9286_I2CSLVTO_64US (0 << 0) >>>> +/* Register 0x3b */ >>>> +#define MAX9286_REV_TRF(n) ((n) << 4) >>>> +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ >>>> +#define MAX9286_REV_AMP_X BIT(0) >>>> +/* Register 0x3f */ >>>> +#define MAX9286_EN_REV_CFG BIT(6) >>>> +#define MAX9286_REV_FLEN(n) ((n) - 20) >>>> +/* Register 0x49 */ >>>> +#define MAX9286_VIDEO_DETECT_MASK 0x0f >>>> +/* Register 0x69 */ >>>> +#define MAX9286_LFLTBMONMASKED BIT(7) >>>> +#define MAX9286_LOCKMONMASKED BIT(6) >>>> +#define MAX9286_AUTOCOMBACKEN BIT(5) >>>> +#define MAX9286_AUTOMASKEN BIT(4) >>>> +#define MAX9286_MASKLINK(n) ((n) << 0) >>>> + >>>> +/* >>>> + * The sink and source pads are created to match the OF graph port numbers so >>>> + * that their indexes can be used interchangeably. >>>> + */ >>>> +#define MAX9286_NUM_GMSL 4 >>>> +#define MAX9286_N_SINKS 4 >>>> +#define MAX9286_N_PADS 5 >>>> +#define MAX9286_SRC_PAD 4 >>>> + >>>> +struct max9286_source { >>>> + struct v4l2_async_subdev asd; >>>> + struct v4l2_subdev *sd; >>>> + struct fwnode_handle *fwnode; >>>> +}; >>>> + >>>> +#define asd_to_max9286_source(_asd) \ >>>> + container_of(_asd, struct max9286_source, asd) >>>> + >>>> +struct max9286_priv { >>>> + struct i2c_client *client; >>>> + struct gpio_desc *gpiod_pwdn; >>>> + struct v4l2_subdev sd; >>>> + struct media_pad pads[MAX9286_N_PADS]; >>>> + struct regulator *regulator; >>>> + >>>> + struct gpio_chip gpio; >>>> + u8 gpio_state; >>>> + >>>> + struct i2c_mux_core *mux; >>>> + unsigned int mux_channel; >>>> + bool mux_open; >>>> + >>>> + struct v4l2_ctrl_handler ctrls; >>>> + struct v4l2_ctrl *pixelrate; >>>> + >>>> + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; >>>> + >>>> + /* Protects controls and fmt structures */ >>>> + struct mutex mutex; >>>> + >>>> + unsigned int nsources; >>>> + unsigned int source_mask; >>>> + unsigned int route_mask; >>>> + unsigned int bound_sources; >>>> + unsigned int csi2_data_lanes; >>>> + struct max9286_source sources[MAX9286_NUM_GMSL]; >>>> + struct v4l2_async_notifier notifier; >>>> +}; >>>> + >>> >>> [...] >>> >>>> +static int max9286_register_gpio(struct max9286_priv *priv) >>>> +{ >>>> + struct device *dev = &priv->client->dev; >>>> + struct gpio_chip *gpio = &priv->gpio; >>>> + int ret; >>>> + >>>> + static const char * const names[] = { >>>> + "GPIO0OUT", >>>> + "GPIO1OUT", >>>> + }; >>>> + >>>> + /* Configure the GPIO */ >>>> + gpio->label = dev_name(dev); >>> >>> So if you have more than one MAX9286 in a system, all gpiochips will appear >>> with the same name. I'd recommend to append the index to distinguish properly. >> >> Ah yes, that's a good point, and I think I've even seen that. >> >> I'll fix it now. Oh, in fact actually this doesn't. gpiodetect prints: gpiochip10 [4-004c] (2 lines) gpiochip11 [4-006c] (2 lines) and mostly references them as gpiochip10 and gpiochip11. However, > [ 2.318533] gpio gpiochip11: Detected name collision for GPIO name 'GPIO0OUT' > [ 2.325739] gpio gpiochip11: Detected name collision for GPIO name 'GPIO1OUT' That seems to be more of a problem for the gpio library, so I think I'll just drop the const names. I don't think they add much value. >>>> + gpio->parent = dev; >>>> + gpio->owner = THIS_MODULE; >>>> + gpio->of_node = dev->of_node; >>>> + gpio->ngpio = 2; >>>> + gpio->base = -1; >>>> + gpio->set = max9286_gpio_set; >>>> + gpio->get = max9286_gpio_get; >>>> + gpio->can_sleep = true; >>>> + gpio->names = names; >>>> + >>>> + /* GPIO values default to high */ >>>> + priv->gpio_state = BIT(0) | BIT(1); >>>> + >>>> + ret = devm_gpiochip_add_data(dev, gpio, priv); >>>> + if (ret) >>>> + dev_err(dev, "Unable to create gpio_chip\n"); >>>> + >>>> + return ret; >>>> +} >>>> + >>> >>> [...] >>> >>>> +static int max9286_parse_dt(struct max9286_priv *priv) >>>> +{ >>>> + struct device *dev = &priv->client->dev; >>>> + struct device_node *i2c_mux; >>>> + struct device_node *node = NULL; >>>> + unsigned int i2c_mux_mask = 0; >>>> + >>>> + of_node_get(dev->of_node); >>> >>> Why this is needed? >> >> Hrm .. I recall adding it to solve dt reference balancing. >> >> I wish I'd added a comment at the time ... as I can't recall the details >> now. >> > > I understand that it is for the refcount balancing but I certainly don't see > a need for it. > >>>> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); >>>> + if (!i2c_mux) { >>>> + dev_err(dev, "Failed to find i2c-mux node\n"); >>>> + of_node_put(dev->of_node); >>>> + return -EINVAL; >>>> + } >>>> + > [...] >>> >>> [...] >>> >>>> +static int max9286_remove(struct i2c_client *client) >>>> +{ >>>> + struct max9286_priv *priv = i2c_get_clientdata(client); >>>> + >>>> + i2c_mux_del_adapters(priv->mux); >>>> + >>>> + max9286_v4l2_unregister(priv); >>>> + >>>> + regulator_disable(priv->regulator); >>>> + >>>> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); >>> >>> Usual power down sequence is to pull the power down gpio low and then turn off >>> the regulators. This helps in clearing up the internal state machine properly. >> >> Do you mean usual, among drivers using regulators? or usual for the max9286? >> > > Usual for devices exposing shutdown gpios and powered by an external regulator. > >> I have a platform which controls the regulators for the cameras >> (priv->regulator) through one of the GPIOs provided by the MAX9286. >> >> If we powerdown the max9286 first, then we will not be able to change >> the GPIO value on the gpio controlled regulator. >> > > Hmm, I didn't think of this usecase. Let's keep it as it is. > > Thanks, > Mani > >> (Currently it doesn't expose as a gpio regulator, but just a gpio-hog - >> but thats a different matter) >> >> -- >> Kieran >> >> >>> >>> Thanks, >>> Mani >>> >>>> + >>>> + max9286_cleanup_dt(priv); >>>> + >>>> + return 0; >>>> +} >>>> + >>>> +static const struct of_device_id max9286_dt_ids[] = { >>>> + { .compatible = "maxim,max9286" }, >>>> + {}, >>>> +}; >>>> +MODULE_DEVICE_TABLE(of, max9286_dt_ids); >>>> + >>>> +static struct i2c_driver max9286_i2c_driver = { >>>> + .driver = { >>>> + .name = "max9286", >>>> + .of_match_table = of_match_ptr(max9286_dt_ids), >>>> + }, >>>> + .probe_new = max9286_probe, >>>> + .remove = max9286_remove, >>>> +}; >>>> + >>>> +module_i2c_driver(max9286_i2c_driver); >>>> + >>>> +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); >>>> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); >>>> +MODULE_LICENSE("GPL"); >>>> -- >>>> 2.25.1 >>>> >>
On 14/05/2020 11:13, Manivannan Sadhasivam wrote: > Hi Kieran, > > On Thu, May 14, 2020 at 11:02:53AM +0100, Kieran Bingham wrote: >> Hi Mani, >> >> On 12/05/2020 19:17, Manivannan Sadhasivam wrote: >>> On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: >>>> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and >>>> CSI-2 output. The device supports multicamera streaming applications, >>>> and features the ability to synchronise the attached cameras. >>>> >>>> CSI-2 output can be configured with 1 to 4 lanes, and a control channel >>>> is supported over I2C, which implements an I2C mux to facilitate >>>> communications with connected cameras across the reverse control >>>> channel. >>>> >>>> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> >>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >>>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >>>> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >>>> >>>> -- >>>> v2: >>>> - Fix MAINTAINERS entry >>>> >>>> This posting is released with the following modifications to work >>>> without Sakari's VC developments: >>>> - max9286_g_mbus_config() re-instated >>>> - max9286_get_frame_desc() is not bus/csi aware >>>> - max9286_{get,set}_routing() removed >>>> >>>> v3: >>>> - Initialise notifier with v4l2_async_notifier_init >>>> - Update for new mbus csi2 format V4L2_MBUS_CSI2_DPHY >>>> >>>> v4: - Re-introduce required code to function with the VC series. >>>> >>>> - Implement max9286_get_routing, max9286_set_routing >>>> - Remove max9286_g_mbus_config >>>> >>>> v5: (internal release) >>>> - Fix printk formatting for hex value >>>> - max9286->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE (add |) >>>> - MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER -> MEDIA_ENT_F_VID_IF_BRIDGE >>>> - Remove 'device is bound' workaround >>>> >>>> v6: >>>> - v4l2_subdev_krouting instead of v4l2_subdev_routing separated >>>> to allow integration without the VC/V4L2-Mux series. >>>> - convert sd_to_max9286 to inline function >>>> - rename max9286_device to max9286_priv >>>> - Cleanup the v4l2_async_notifier >>>> - Extend MODULE_AUTHOR >>>> - Replace of_graph_get_endpoint_by_regs with fwnode_graph_get_endpoint_by_id >>>> - Pass default bus type when parsing fwnode endpoint (Manivannan Sadhasivam) >>>> - Use new YAML file reference in MAINTAINERS >>>> - Parse new i2c-mux node in max9286_get_i2c_by_id >>>> (This could/should be refactored to parse these separately first) >>>> - Spelling and calculation fixes in the FSYNC_LOCKED check comments >>>> - Identify each enabled i2c-mux channel in a single pass >>>> - max9286: Improve mux-state readbility [v2] >>>> - Fix frame sync lock durations >>>> - Add comment to describe /why/ we must open the mux in s_stream >>>> - use -EXDEV as return code for failed link synchronisation. >>>> - Fix reference counting of the dt nodeS >>>> - Convert to probe_new for I2C >>>> - Remove redundant max9286_i2c_mux_state >>>> - Provide optional enable-gpio (max9286-pwdn) >>>> >>>> v7: >>>> [Kieran] >>>> - Ensure powerdown lines are optional >>>> - Add a 4ms power-up delay >>>> - Add max9286_check_config_link() to core >>>> - Add GPIO chip controller for GPIO0OUT and GPIO1OUT >>>> - Fix GPIO registration >>>> - max9286: Split out async registration >>>> (fixes regulator -EPROBE_DEFERs failures) >>>> - Collect all V4L2 registrations >>>> - balance v4l2_async refcnting >>>> - Rename max9286_v4l2_async_ => max9286_v4l2_notifier_ >>>> >>>> [Jacopo] >>>> - Remove redundanct MAXIM_I2C_SPEED macros >>>> - Move notifiers operations >>>> - Add delay after reverse channel reconfiguration >>>> - Move link setup to completion >>>> - Fix up max9286_check_config_link() implementation >>>> - Remove redundant dual configuration of reverse channel >>>> >>>> v8: >>>> >>>> [Kieran] >>>> - Update the bound_sources mask on unbind >>>> - Convert probe kzalloc usage to devm_ variant >>>> - Fix up cleanup path from GPIO PowerDown registration >>>> - cleanup GPIO device registration fail path >>>> - Convert to use devm_regulator_get() >>>> - Fit max9286_parse_dt print on one line >>>> - Move multi-device workarounds out of upstream driver >>>> - Remove I2C mod-table >>>> - Lock format changes >>>> - Describe pad index usage >>>> - Remove poc_enabled workaround >>>> - Rename the max9286_gpio to be more explicit on it's actions. >>>> - Move max9286_init_format call >>>> - Rework probe sequence and simplify error paths. >>>> - Simplify i2c comments >>>> - Implement Pixelrate control >>>> - Disable overlap window >>>> >>>> [Jacopo] >>>> - Adapt Kconfig to latest upstream changes >>>> - Put of node on error >>>> - Calculate pixel rate >>>> - Simplify overlap window disablement >>>> >>>> v9: >>>> >>>> [Kieran] >>>> - Kconfig: Depend on OF >>>> - Re-sort addition to Makefile >>>> --- >>>> MAINTAINERS | 10 + >>>> drivers/media/i2c/Kconfig | 13 + >>>> drivers/media/i2c/Makefile | 1 + >>>> drivers/media/i2c/max9286.c | 1332 +++++++++++++++++++++++++++++++++++ >>>> 4 files changed, 1356 insertions(+) >>>> create mode 100644 drivers/media/i2c/max9286.c >>>> >>>> diff --git a/MAINTAINERS b/MAINTAINERS >>>> index a7bb6e22d5da..99e3bf7760fd 100644 >>>> --- a/MAINTAINERS >>>> +++ b/MAINTAINERS >>>> @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst >>>> F: drivers/hwmon/max6697.c >>>> F: include/linux/platform_data/max6697.h >>>> >>>> +MAX9286 QUAD GMSL DESERIALIZER DRIVER >>>> +M: Jacopo Mondi <jacopo+renesas@jmondi.org> >>>> +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >>>> +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >>>> +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >>>> +L: linux-media@vger.kernel.org >>>> +S: Maintained >>>> +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml >>>> +F: drivers/media/i2c/max9286.c >>>> + >>>> MAX9860 MONO AUDIO VOICE CODEC DRIVER >>>> M: Peter Rosin <peda@axentia.se> >>>> L: alsa-devel@alsa-project.org (moderated for non-subscribers) >>>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig >>>> index 3abc80373ec0..2e390f41f6da 100644 >>>> --- a/drivers/media/i2c/Kconfig >>>> +++ b/drivers/media/i2c/Kconfig >>>> @@ -464,6 +464,19 @@ config VIDEO_VPX3220 >>>> To compile this driver as a module, choose M here: the >>>> module will be called vpx3220. >>>> >>>> +config VIDEO_MAX9286 >>>> + tristate "Maxim MAX9286 GMSL deserializer support" >>>> + depends on I2C && I2C_MUX >>>> + depends on OF >>>> + select V4L2_FWNODE >>>> + select VIDEO_V4L2_SUBDEV_API >>>> + select MEDIA_CONTROLLER >>>> + help >>>> + This driver supports the Maxim MAX9286 GMSL deserializer. >>>> + >>>> + To compile this driver as a module, choose M here: the >>>> + module will be called max9286. >>>> + >>>> comment "Video and audio decoders" >>>> >>>> config VIDEO_SAA717X >>>> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile >>>> index 77bf7d0b691f..f0b001ee4b05 100644 >>>> --- a/drivers/media/i2c/Makefile >>>> +++ b/drivers/media/i2c/Makefile >>>> @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o >>>> obj-$(CONFIG_VIDEO_IMX290) += imx290.o >>>> obj-$(CONFIG_VIDEO_IMX319) += imx319.o >>>> obj-$(CONFIG_VIDEO_IMX355) += imx355.o >>>> +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o >>>> obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o >>>> >>>> obj-$(CONFIG_SDR_MAX2175) += max2175.o >>>> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c >>>> new file mode 100644 >>>> index 000000000000..481d65f2b51d >>>> --- /dev/null >>>> +++ b/drivers/media/i2c/max9286.c >>>> @@ -0,0 +1,1332 @@ >>>> +// SPDX-License-Identifier: GPL-2.0+ >>>> +/* >>>> + * Maxim MAX9286 GMSL Deserializer Driver >>>> + * >>>> + * Copyright (C) 2017-2019 Jacopo Mondi >>>> + * Copyright (C) 2017-2019 Kieran Bingham >>>> + * Copyright (C) 2017-2019 Laurent Pinchart >>>> + * Copyright (C) 2017-2019 Niklas Söderlund >>>> + * Copyright (C) 2016 Renesas Electronics Corporation >>>> + * Copyright (C) 2015 Cogent Embedded, Inc. >>>> + */ >>>> + >>>> +#include <linux/delay.h> >>>> +#include <linux/device.h> >>>> +#include <linux/fwnode.h> >>>> +#include <linux/gpio/consumer.h> >>>> +#include <linux/gpio/driver.h> >>>> +#include <linux/i2c.h> >>>> +#include <linux/i2c-mux.h> >>>> +#include <linux/module.h> >>>> +#include <linux/mutex.h> >>>> +#include <linux/of_graph.h> >>>> +#include <linux/regulator/consumer.h> >>>> +#include <linux/slab.h> >>>> + >>>> +#include <media/v4l2-async.h> >>>> +#include <media/v4l2-ctrls.h> >>>> +#include <media/v4l2-device.h> >>>> +#include <media/v4l2-fwnode.h> >>>> +#include <media/v4l2-subdev.h> >>>> + >>>> +/* Register 0x00 */ >>>> +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) >>>> +#define MAX9286_MSTLINKSEL(n) ((n) << 5) >>>> +#define MAX9286_EN_VS_GEN BIT(4) >>>> +#define MAX9286_LINKEN(n) (1 << (n)) >>>> +/* Register 0x01 */ >>>> +#define MAX9286_FSYNCMODE_ECU (3 << 6) >>>> +#define MAX9286_FSYNCMODE_EXT (2 << 6) >>>> +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) >>>> +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) >>>> +#define MAX9286_GPIEN BIT(5) >>>> +#define MAX9286_ENLMO_RSTFSYNC BIT(2) >>>> +#define MAX9286_FSYNCMETH_AUTO (2 << 0) >>>> +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) >>>> +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) >>>> +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 >>>> +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 >>>> +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 >>>> +/* Register 0x0a */ >>>> +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) >>>> +#define MAX9286_REVCCEN(n) (1 << (n)) >>>> +/* Register 0x0c */ >>>> +#define MAX9286_HVEN BIT(7) >>>> +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) >>>> +#define MAX9286_EDC_6BIT_CRC (1 << 5) >>>> +#define MAX9286_EDC_1BIT_PARITY (0 << 5) >>>> +#define MAX9286_DESEL BIT(4) >>>> +#define MAX9286_INVVS BIT(3) >>>> +#define MAX9286_INVHS BIT(2) >>>> +#define MAX9286_HVSRC_D0 (2 << 0) >>>> +#define MAX9286_HVSRC_D14 (1 << 0) >>>> +#define MAX9286_HVSRC_D18 (0 << 0) >>>> +/* Register 0x0f */ >>>> +#define MAX9286_0X0F_RESERVED BIT(3) >>>> +/* Register 0x12 */ >>>> +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) >>>> +#define MAX9286_CSIDBL BIT(5) >>>> +#define MAX9286_DBL BIT(4) >>>> +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) >>>> +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) >>>> +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) >>>> +#define MAX9286_DATATYPE_RAW14 (8 << 0) >>>> +#define MAX9286_DATATYPE_RAW11 (7 << 0) >>>> +#define MAX9286_DATATYPE_RAW10 (6 << 0) >>>> +#define MAX9286_DATATYPE_RAW8 (5 << 0) >>>> +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) >>>> +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) >>>> +#define MAX9286_DATATYPE_RGB555 (2 << 0) >>>> +#define MAX9286_DATATYPE_RGB565 (1 << 0) >>>> +#define MAX9286_DATATYPE_RGB888 (0 << 0) >>>> +/* Register 0x15 */ >>>> +#define MAX9286_VC(n) ((n) << 5) >>>> +#define MAX9286_VCTYPE BIT(4) >>>> +#define MAX9286_CSIOUTEN BIT(3) >>>> +#define MAX9286_0X15_RESV (3 << 0) >>>> +/* Register 0x1b */ >>>> +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) >>>> +#define MAX9286_ENEQ(n) (1 << (n)) >>>> +/* Register 0x27 */ >>>> +#define MAX9286_LOCKED BIT(7) >>>> +/* Register 0x31 */ >>>> +#define MAX9286_FSYNC_LOCKED BIT(6) >>>> +/* Register 0x34 */ >>>> +#define MAX9286_I2CLOCACK BIT(7) >>>> +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) >>>> +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) >>>> +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) >>>> +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) >>>> +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) >>>> +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) >>>> +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) >>>> +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) >>>> +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) >>>> +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) >>>> +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) >>>> +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) >>>> +#define MAX9286_I2CSLVTO_NONE (3 << 0) >>>> +#define MAX9286_I2CSLVTO_1024US (2 << 0) >>>> +#define MAX9286_I2CSLVTO_256US (1 << 0) >>>> +#define MAX9286_I2CSLVTO_64US (0 << 0) >>>> +/* Register 0x3b */ >>>> +#define MAX9286_REV_TRF(n) ((n) << 4) >>>> +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ >>>> +#define MAX9286_REV_AMP_X BIT(0) >>>> +/* Register 0x3f */ >>>> +#define MAX9286_EN_REV_CFG BIT(6) >>>> +#define MAX9286_REV_FLEN(n) ((n) - 20) >>>> +/* Register 0x49 */ >>>> +#define MAX9286_VIDEO_DETECT_MASK 0x0f >>>> +/* Register 0x69 */ >>>> +#define MAX9286_LFLTBMONMASKED BIT(7) >>>> +#define MAX9286_LOCKMONMASKED BIT(6) >>>> +#define MAX9286_AUTOCOMBACKEN BIT(5) >>>> +#define MAX9286_AUTOMASKEN BIT(4) >>>> +#define MAX9286_MASKLINK(n) ((n) << 0) >>>> + >>>> +/* >>>> + * The sink and source pads are created to match the OF graph port numbers so >>>> + * that their indexes can be used interchangeably. >>>> + */ >>>> +#define MAX9286_NUM_GMSL 4 >>>> +#define MAX9286_N_SINKS 4 >>>> +#define MAX9286_N_PADS 5 >>>> +#define MAX9286_SRC_PAD 4 >>>> + >>>> +struct max9286_source { >>>> + struct v4l2_async_subdev asd; >>>> + struct v4l2_subdev *sd; >>>> + struct fwnode_handle *fwnode; >>>> +}; >>>> + >>>> +#define asd_to_max9286_source(_asd) \ >>>> + container_of(_asd, struct max9286_source, asd) >>>> + >>>> +struct max9286_priv { >>>> + struct i2c_client *client; >>>> + struct gpio_desc *gpiod_pwdn; >>>> + struct v4l2_subdev sd; >>>> + struct media_pad pads[MAX9286_N_PADS]; >>>> + struct regulator *regulator; >>>> + >>>> + struct gpio_chip gpio; >>>> + u8 gpio_state; >>>> + >>>> + struct i2c_mux_core *mux; >>>> + unsigned int mux_channel; >>>> + bool mux_open; >>>> + >>>> + struct v4l2_ctrl_handler ctrls; >>>> + struct v4l2_ctrl *pixelrate; >>>> + >>>> + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; >>>> + >>>> + /* Protects controls and fmt structures */ >>>> + struct mutex mutex; >>>> + >>>> + unsigned int nsources; >>>> + unsigned int source_mask; >>>> + unsigned int route_mask; >>>> + unsigned int bound_sources; >>>> + unsigned int csi2_data_lanes; >>>> + struct max9286_source sources[MAX9286_NUM_GMSL]; >>>> + struct v4l2_async_notifier notifier; >>>> +}; >>>> + >>> >>> [...] >>> >>>> +static int max9286_register_gpio(struct max9286_priv *priv) >>>> +{ >>>> + struct device *dev = &priv->client->dev; >>>> + struct gpio_chip *gpio = &priv->gpio; >>>> + int ret; >>>> + >>>> + static const char * const names[] = { >>>> + "GPIO0OUT", >>>> + "GPIO1OUT", >>>> + }; >>>> + >>>> + /* Configure the GPIO */ >>>> + gpio->label = dev_name(dev); >>> >>> So if you have more than one MAX9286 in a system, all gpiochips will appear >>> with the same name. I'd recommend to append the index to distinguish properly. >> >> Ah yes, that's a good point, and I think I've even seen that. >> >> I'll fix it now. >> >>> >>>> + gpio->parent = dev; >>>> + gpio->owner = THIS_MODULE; >>>> + gpio->of_node = dev->of_node; >>>> + gpio->ngpio = 2; >>>> + gpio->base = -1; >>>> + gpio->set = max9286_gpio_set; >>>> + gpio->get = max9286_gpio_get; >>>> + gpio->can_sleep = true; >>>> + gpio->names = names; >>>> + >>>> + /* GPIO values default to high */ >>>> + priv->gpio_state = BIT(0) | BIT(1); >>>> + >>>> + ret = devm_gpiochip_add_data(dev, gpio, priv); >>>> + if (ret) >>>> + dev_err(dev, "Unable to create gpio_chip\n"); >>>> + >>>> + return ret; >>>> +} >>>> + >>> >>> [...] >>> >>>> +static int max9286_parse_dt(struct max9286_priv *priv) >>>> +{ >>>> + struct device *dev = &priv->client->dev; >>>> + struct device_node *i2c_mux; >>>> + struct device_node *node = NULL; >>>> + unsigned int i2c_mux_mask = 0; >>>> + >>>> + of_node_get(dev->of_node); >>> >>> Why this is needed? >> >> Hrm .. I recall adding it to solve dt reference balancing. >> >> I wish I'd added a comment at the time ... as I can't recall the details >> now. >> > > I understand that it is for the refcount balancing but I certainly don't see > a need for it. I'll go through and try to validate this again now. > >>>> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); >>>> + if (!i2c_mux) { >>>> + dev_err(dev, "Failed to find i2c-mux node\n"); >>>> + of_node_put(dev->of_node); >>>> + return -EINVAL; >>>> + } >>>> + > [...] >>> >>> [...] >>> >>>> +static int max9286_remove(struct i2c_client *client) >>>> +{ >>>> + struct max9286_priv *priv = i2c_get_clientdata(client); >>>> + >>>> + i2c_mux_del_adapters(priv->mux); >>>> + >>>> + max9286_v4l2_unregister(priv); >>>> + >>>> + regulator_disable(priv->regulator); >>>> + >>>> + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); >>> >>> Usual power down sequence is to pull the power down gpio low and then turn off >>> the regulators. This helps in clearing up the internal state machine properly. >> >> Do you mean usual, among drivers using regulators? or usual for the max9286? >> > > Usual for devices exposing shutdown gpios and powered by an external regulator. > >> I have a platform which controls the regulators for the cameras >> (priv->regulator) through one of the GPIOs provided by the MAX9286. >> >> If we powerdown the max9286 first, then we will not be able to change >> the GPIO value on the gpio controlled regulator. >> > > Hmm, I didn't think of this usecase. Let's keep it as it is. Aha indeed it's not clear (especially as the variable is just 'regulator'). The regulator being controlled here does not power the max9286, but the cameras attached to the max9286 which can be powered up / down separately to the max9286. -- Kieran > > Thanks, > Mani > >> (Currently it doesn't expose as a gpio regulator, but just a gpio-hog - >> but thats a different matter) >> >> -- >> Kieran >> >> >>> >>> Thanks, >>> Mani >>> >>>> + >>>> + max9286_cleanup_dt(priv); >>>> + >>>> + return 0; >>>> +} >>>> + >>>> +static const struct of_device_id max9286_dt_ids[] = { >>>> + { .compatible = "maxim,max9286" }, >>>> + {}, >>>> +}; >>>> +MODULE_DEVICE_TABLE(of, max9286_dt_ids); >>>> + >>>> +static struct i2c_driver max9286_i2c_driver = { >>>> + .driver = { >>>> + .name = "max9286", >>>> + .of_match_table = of_match_ptr(max9286_dt_ids), >>>> + }, >>>> + .probe_new = max9286_probe, >>>> + .remove = max9286_remove, >>>> +}; >>>> + >>>> +module_i2c_driver(max9286_i2c_driver); >>>> + >>>> +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); >>>> +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); >>>> +MODULE_LICENSE("GPL"); >>>> -- >>>> 2.25.1 >>>> >>
Hi Kieran, On Thu, May 14, 2020 at 1:47 PM Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> wrote: > On 14/05/2020 11:13, Manivannan Sadhasivam wrote: > > On Thu, May 14, 2020 at 11:02:53AM +0100, Kieran Bingham wrote: > >> On 12/05/2020 19:17, Manivannan Sadhasivam wrote: > >>> On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > >>>> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and > >>>> CSI-2 output. The device supports multicamera streaming applications, > >>>> and features the ability to synchronise the attached cameras. > >>>> > >>>> CSI-2 output can be configured with 1 to 4 lanes, and a control channel > >>>> is supported over I2C, which implements an I2C mux to facilitate > >>>> communications with connected cameras across the reverse control > >>>> channel. > >>>> > >>>> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> > >>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > >>>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > >>>> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > >>>> --- /dev/null > >>>> +++ b/drivers/media/i2c/max9286.c > >>>> +static int max9286_register_gpio(struct max9286_priv *priv) > >>>> +{ > >>>> + struct device *dev = &priv->client->dev; > >>>> + struct gpio_chip *gpio = &priv->gpio; > >>>> + int ret; > >>>> + > >>>> + static const char * const names[] = { > >>>> + "GPIO0OUT", > >>>> + "GPIO1OUT", > >>>> + }; > >>>> + > >>>> + /* Configure the GPIO */ > >>>> + gpio->label = dev_name(dev); > >>> > >>> So if you have more than one MAX9286 in a system, all gpiochips will appear > >>> with the same name. I'd recommend to append the index to distinguish properly. > >> > >> Ah yes, that's a good point, and I think I've even seen that. > >> > >> I'll fix it now. > > Oh, in fact actually this doesn't. > > gpiodetect prints: > > gpiochip10 [4-004c] (2 lines) > gpiochip11 [4-006c] (2 lines) > > and mostly references them as gpiochip10 and gpiochip11. Indeed, dev_name() should be different for each instance. > However, > > > [ 2.318533] gpio gpiochip11: Detected name collision for GPIO name 'GPIO0OUT' > > [ 2.325739] gpio gpiochip11: Detected name collision for GPIO name 'GPIO1OUT' > > That seems to be more of a problem for the gpio library, so I think I'll > just drop the const names. I don't think they add much value. These are the line names. If they're not unique, a warning is printed, but they are still registered. So probably you want to use kasprintf("%s.%s", dev_name(dev), names[i]) to generate names. See "[PATCH] gpiolib: Document that GPIO line names are not globally unique" (https://lore.kernel.org/linux-gpio/20200511101828.30046-1-geert+renesas@glider.be/) to clear up the details. Gr{oetje,eeting}s, Geert
Hi Mani, On 14/05/2020 12:47, Kieran Bingham wrote: > On 14/05/2020 11:13, Manivannan Sadhasivam wrote: >> Hi Kieran, <snip> >>>>> +static int max9286_parse_dt(struct max9286_priv *priv) >>>>> +{ >>>>> + struct device *dev = &priv->client->dev; >>>>> + struct device_node *i2c_mux; >>>>> + struct device_node *node = NULL; >>>>> + unsigned int i2c_mux_mask = 0; >>>>> + >>>>> + of_node_get(dev->of_node); >>>> >>>> Why this is needed? >>> >>> Hrm .. I recall adding it to solve dt reference balancing. >>> >>> I wish I'd added a comment at the time ... as I can't recall the details >>> now. >>> >> >> I understand that it is for the refcount balancing but I certainly don't see >> a need for it. > > I'll go through and try to validate this again now. Aha, that's why: * of_find_node_by_name - Find a node by its "name" property * @from: The node to start searching from or NULL; the node * you pass will not be searched, only the next one * will. Typically, you pass what the previous call * returned. of_node_put() will be called on @from. * @name: The name string to match against I'll add a comment to state that it is to balance the of_node_put during of_find_node_by_name(). -- Kieran >>>>> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); >>>>> + if (!i2c_mux) { >>>>> + dev_err(dev, "Failed to find i2c-mux node\n"); >>>>> + of_node_put(dev->of_node); >>>>> + return -EINVAL; >>>>> + } >>>>> + >> [...] >>>>
On Thu, May 14, 2020 at 01:59:35PM +0200, Geert Uytterhoeven wrote: > Hi Kieran, > > On Thu, May 14, 2020 at 1:47 PM Kieran Bingham > <kieran.bingham+renesas@ideasonboard.com> wrote: > > On 14/05/2020 11:13, Manivannan Sadhasivam wrote: > > > On Thu, May 14, 2020 at 11:02:53AM +0100, Kieran Bingham wrote: > > >> On 12/05/2020 19:17, Manivannan Sadhasivam wrote: > > >>> On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > > >>>> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and > > >>>> CSI-2 output. The device supports multicamera streaming applications, > > >>>> and features the ability to synchronise the attached cameras. > > >>>> > > >>>> CSI-2 output can be configured with 1 to 4 lanes, and a control channel > > >>>> is supported over I2C, which implements an I2C mux to facilitate > > >>>> communications with connected cameras across the reverse control > > >>>> channel. > > >>>> > > >>>> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> > > >>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > > >>>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > > >>>> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > > > >>>> --- /dev/null > > >>>> +++ b/drivers/media/i2c/max9286.c > > > >>>> +static int max9286_register_gpio(struct max9286_priv *priv) > > >>>> +{ > > >>>> + struct device *dev = &priv->client->dev; > > >>>> + struct gpio_chip *gpio = &priv->gpio; > > >>>> + int ret; > > >>>> + > > >>>> + static const char * const names[] = { > > >>>> + "GPIO0OUT", > > >>>> + "GPIO1OUT", > > >>>> + }; > > >>>> + > > >>>> + /* Configure the GPIO */ > > >>>> + gpio->label = dev_name(dev); > > >>> > > >>> So if you have more than one MAX9286 in a system, all gpiochips will appear > > >>> with the same name. I'd recommend to append the index to distinguish properly. > > >> > > >> Ah yes, that's a good point, and I think I've even seen that. > > >> > > >> I'll fix it now. > > > > Oh, in fact actually this doesn't. > > > > gpiodetect prints: > > > > gpiochip10 [4-004c] (2 lines) > > gpiochip11 [4-006c] (2 lines) > > > > and mostly references them as gpiochip10 and gpiochip11. > > Indeed, dev_name() should be different for each instance. > Ah, my bad! Somehow I got confused that this delivers static name... Sorry for the noise, Kieran. > > However, > > > > > [ 2.318533] gpio gpiochip11: Detected name collision for GPIO name 'GPIO0OUT' > > > [ 2.325739] gpio gpiochip11: Detected name collision for GPIO name 'GPIO1OUT' > > > > That seems to be more of a problem for the gpio library, so I think I'll > > just drop the const names. I don't think they add much value. > Well, I should've pointed this instead of above... (lack of coffee) > These are the line names. If they're not unique, a warning is printed, > but they are still registered. > So probably you want to use kasprintf("%s.%s", dev_name(dev), names[i]) to > generate names. > Ack. I think you should CC Linus W for next iteration to get review for gpiolib implementation. Thanks, Mani > See "[PATCH] gpiolib: Document that GPIO line names are not globally unique" > (https://lore.kernel.org/linux-gpio/20200511101828.30046-1-geert+renesas@glider.be/) > to clear up the details. > > Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org > > In personal conversations with technical people, I call myself a hacker. But > when I'm talking to journalists I just say "programmer" or something like that. > -- Linus Torvalds
On Thu, May 14, 2020 at 01:27:01PM +0100, Kieran Bingham wrote: > Hi Mani, > > On 14/05/2020 12:47, Kieran Bingham wrote: > > On 14/05/2020 11:13, Manivannan Sadhasivam wrote: > >> Hi Kieran, > <snip> > > >>>>> +static int max9286_parse_dt(struct max9286_priv *priv) > >>>>> +{ > >>>>> + struct device *dev = &priv->client->dev; > >>>>> + struct device_node *i2c_mux; > >>>>> + struct device_node *node = NULL; > >>>>> + unsigned int i2c_mux_mask = 0; > >>>>> + > >>>>> + of_node_get(dev->of_node); > >>>> > >>>> Why this is needed? > >>> > >>> Hrm .. I recall adding it to solve dt reference balancing. > >>> > >>> I wish I'd added a comment at the time ... as I can't recall the details > >>> now. > >>> > >> > >> I understand that it is for the refcount balancing but I certainly don't see > >> a need for it. > > > > I'll go through and try to validate this again now. > > Aha, that's why: > > * of_find_node_by_name - Find a node by its "name" property > * @from: The node to start searching from or NULL; the node > * you pass will not be searched, only the next one > * will. Typically, you pass what the previous call > * returned. of_node_put() will be called on @from. > * @name: The name string to match against > > I'll add a comment to state that it is to balance the of_node_put during > of_find_node_by_name(). > Ah, right. I mostly use of_find_node_by_name() with NULL, so didn't realize this. And yeah, a comment would be helpful. Thanks, Mani > -- > Kieran > > > >>>>> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > >>>>> + if (!i2c_mux) { > >>>>> + dev_err(dev, "Failed to find i2c-mux node\n"); > >>>>> + of_node_put(dev->of_node); > >>>>> + return -EINVAL; > >>>>> + } > >>>>> + > >> [...] > >>>> > -- > Regards > -- > Kieran
On 14/05/2020 13:48, Manivannan Sadhasivam wrote: > On Thu, May 14, 2020 at 01:59:35PM +0200, Geert Uytterhoeven wrote: >> Hi Kieran, >> >> On Thu, May 14, 2020 at 1:47 PM Kieran Bingham >> <kieran.bingham+renesas@ideasonboard.com> wrote: >>> On 14/05/2020 11:13, Manivannan Sadhasivam wrote: >>>> On Thu, May 14, 2020 at 11:02:53AM +0100, Kieran Bingham wrote: >>>>> On 12/05/2020 19:17, Manivannan Sadhasivam wrote: >>>>>> On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: >>>>>>> The MAX9286 is a 4-channel GMSL deserializer with coax or STP input and >>>>>>> CSI-2 output. The device supports multicamera streaming applications, >>>>>>> and features the ability to synchronise the attached cameras. >>>>>>> >>>>>>> CSI-2 output can be configured with 1 to 4 lanes, and a control channel >>>>>>> is supported over I2C, which implements an I2C mux to facilitate >>>>>>> communications with connected cameras across the reverse control >>>>>>> channel. >>>>>>> >>>>>>> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> >>>>>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >>>>>>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> >>>>>>> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> >> >>>>>>> --- /dev/null >>>>>>> +++ b/drivers/media/i2c/max9286.c >> >>>>>>> +static int max9286_register_gpio(struct max9286_priv *priv) >>>>>>> +{ >>>>>>> + struct device *dev = &priv->client->dev; >>>>>>> + struct gpio_chip *gpio = &priv->gpio; >>>>>>> + int ret; >>>>>>> + >>>>>>> + static const char * const names[] = { >>>>>>> + "GPIO0OUT", >>>>>>> + "GPIO1OUT", >>>>>>> + }; >>>>>>> + >>>>>>> + /* Configure the GPIO */ >>>>>>> + gpio->label = dev_name(dev); >>>>>> >>>>>> So if you have more than one MAX9286 in a system, all gpiochips will appear >>>>>> with the same name. I'd recommend to append the index to distinguish properly. >>>>> >>>>> Ah yes, that's a good point, and I think I've even seen that. >>>>> >>>>> I'll fix it now. >>> >>> Oh, in fact actually this doesn't. >>> >>> gpiodetect prints: >>> >>> gpiochip10 [4-004c] (2 lines) >>> gpiochip11 [4-006c] (2 lines) >>> >>> and mostly references them as gpiochip10 and gpiochip11. >> >> Indeed, dev_name() should be different for each instance. >> > > Ah, my bad! Somehow I got confused that this delivers static name... Sorry for > the noise, Kieran. > >>> However, >>> >>>> [ 2.318533] gpio gpiochip11: Detected name collision for GPIO name 'GPIO0OUT' >>>> [ 2.325739] gpio gpiochip11: Detected name collision for GPIO name 'GPIO1OUT' >>> >>> That seems to be more of a problem for the gpio library, so I think I'll >>> just drop the const names. I don't think they add much value. >> > > Well, I should've pointed this instead of above... > > (lack of coffee) > >> These are the line names. If they're not unique, a warning is printed, >> but they are still registered. >> So probably you want to use kasprintf("%s.%s", dev_name(dev), names[i]) to >> generate names. >> > > Ack. > > I think you should CC Linus W for next iteration to get review for gpiolib > implementation. Good idea. I think I'll drop the names though for now. -- Kieran > > Thanks, > Mani > >> See "[PATCH] gpiolib: Document that GPIO line names are not globally unique" >> (https://lore.kernel.org/linux-gpio/20200511101828.30046-1-geert+renesas@glider.be/) >> to clear up the details. >> >> Gr{oetje,eeting}s, >> >> Geert >> >> -- >> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org >> >> In personal conversations with technical people, I call myself a hacker. But >> when I'm talking to journalists I just say "programmer" or something like that. >> -- Linus Torvalds
Hi Kieran, Thanks for the update. On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: ... > +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_mbus_code_enum *code) > +{ > + if (code->pad || code->index > 0) > + return -EINVAL; > + > + code->code = MEDIA_BUS_FMT_UYVY8_2X8; Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel variant of the format is generally used on the serial busses. This choice was made when serial busses were introduced. > + > + return 0; > +} > + > +static struct v4l2_mbus_framefmt * > +max9286_get_pad_format(struct max9286_priv *priv, > + struct v4l2_subdev_pad_config *cfg, > + unsigned int pad, u32 which) > +{ > + switch (which) { > + case V4L2_SUBDEV_FORMAT_TRY: > + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); > + case V4L2_SUBDEV_FORMAT_ACTIVE: > + return &priv->fmt[pad]; > + default: > + return NULL; > + } > +} > + > +static int max9286_set_fmt(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg, > + struct v4l2_subdev_format *format) > +{ > + struct max9286_priv *priv = sd_to_max9286(sd); > + struct v4l2_mbus_framefmt *cfg_fmt; > + > + if (format->pad >= MAX9286_SRC_PAD) > + return -EINVAL; You can remove these checks; it's been already done by the caller. ... > +static int max9286_parse_dt(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct device_node *i2c_mux; > + struct device_node *node = NULL; > + unsigned int i2c_mux_mask = 0; > + > + of_node_get(dev->of_node); > + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > + if (!i2c_mux) { > + dev_err(dev, "Failed to find i2c-mux node\n"); > + of_node_put(dev->of_node); > + return -EINVAL; > + } > + > + /* Identify which i2c-mux channels are enabled */ > + for_each_child_of_node(i2c_mux, node) { > + u32 id = 0; > + > + of_property_read_u32(node, "reg", &id); > + if (id >= MAX9286_NUM_GMSL) > + continue; > + > + if (!of_device_is_available(node)) { > + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); > + continue; > + } > + > + i2c_mux_mask |= BIT(id); > + } > + of_node_put(node); > + of_node_put(i2c_mux); > + > + /* Parse the endpoints */ > + for_each_endpoint_of_node(dev->of_node, node) { > + struct max9286_source *source; > + struct of_endpoint ep; > + > + of_graph_parse_endpoint(node, &ep); > + dev_dbg(dev, "Endpoint %pOF on port %d", > + ep.local_node, ep.port); > + > + if (ep.port > MAX9286_NUM_GMSL) { > + dev_err(dev, "Invalid endpoint %s on port %d", > + of_node_full_name(ep.local_node), ep.port); > + continue; > + } > + > + /* For the source endpoint just parse the bus configuration. */ > + if (ep.port == MAX9286_SRC_PAD) { > + struct v4l2_fwnode_endpoint vep = { > + .bus_type = V4L2_MBUS_CSI2_DPHY > + }; > + int ret; > + > + ret = v4l2_fwnode_endpoint_parse( > + of_fwnode_handle(node), &vep); > + if (ret) { > + of_node_put(node); > + of_node_put(dev->of_node); > + return ret; > + } > + > + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { This won't happen, the bus type will stay if you set it to a non-zero value. > + dev_err(dev, > + "Media bus %u type not supported\n", > + vep.bus_type); > + v4l2_fwnode_endpoint_free(&vep); > + of_node_put(node); > + of_node_put(dev->of_node); > + return -EINVAL; > + } > + > + priv->csi2_data_lanes = > + vep.bus.mipi_csi2.num_data_lanes; > + v4l2_fwnode_endpoint_free(&vep); No need to call this unless you use v4l2_fwnode_endpoint_alloc_parse(). And as you don't, you also won't know which frequencies are known to be safe to use. That said, perhaps where this device is used having a random frequency on that bus could not be an issue. Perhaps. > + > + continue; > + } > + > + /* Skip if the corresponding GMSL link is unavailable. */ > + if (!(i2c_mux_mask & BIT(ep.port))) > + continue; > + > + if (priv->sources[ep.port].fwnode) { > + dev_err(dev, > + "Multiple port endpoints are not supported: %d", > + ep.port); > + > + continue; > + } > + > + source = &priv->sources[ep.port]; > + source->fwnode = fwnode_graph_get_remote_endpoint( > + of_fwnode_handle(node)); > + if (!source->fwnode) { > + dev_err(dev, > + "Endpoint %pOF has no remote endpoint connection\n", > + ep.local_node); > + > + continue; > + } > + > + priv->source_mask |= BIT(ep.port); > + priv->nsources++; > + } > + of_node_put(node); > + of_node_put(dev->of_node); > + > + priv->route_mask = priv->source_mask; > + > + return 0; > +}
Hi Sakari, There are only fairly minor comments here, fix ups will be included in a v10. Is there anything major blocking integration? Regards Kieran On 16/05/2020 22:51, Sakari Ailus wrote: > Hi Kieran, > > Thanks for the update. > > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > > ... > >> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, >> + struct v4l2_subdev_pad_config *cfg, >> + struct v4l2_subdev_mbus_code_enum *code) >> +{ >> + if (code->pad || code->index > 0) >> + return -EINVAL; >> + >> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; > > Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel > variant of the format is generally used on the serial busses. This choice > was made when serial busses were introduced. Ok - I presume this doesn't really have much effect anyway, they just have to match for the transmitter/receiver? But it makes sense to me, so I'll update to the 1x16 variant. >> + >> + return 0; >> +} >> + >> +static struct v4l2_mbus_framefmt * >> +max9286_get_pad_format(struct max9286_priv *priv, >> + struct v4l2_subdev_pad_config *cfg, >> + unsigned int pad, u32 which) >> +{ >> + switch (which) { >> + case V4L2_SUBDEV_FORMAT_TRY: >> + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); >> + case V4L2_SUBDEV_FORMAT_ACTIVE: >> + return &priv->fmt[pad]; >> + default: >> + return NULL; >> + } >> +} >> + >> +static int max9286_set_fmt(struct v4l2_subdev *sd, >> + struct v4l2_subdev_pad_config *cfg, >> + struct v4l2_subdev_format *format) >> +{ >> + struct max9286_priv *priv = sd_to_max9286(sd); >> + struct v4l2_mbus_framefmt *cfg_fmt; >> + >> + if (format->pad >= MAX9286_SRC_PAD) >> + return -EINVAL; > > You can remove these checks; it's been already done by the caller. > Ok. > ... > >> +static int max9286_parse_dt(struct max9286_priv *priv) >> +{ >> + struct device *dev = &priv->client->dev; >> + struct device_node *i2c_mux; >> + struct device_node *node = NULL; >> + unsigned int i2c_mux_mask = 0; >> + >> + of_node_get(dev->of_node); >> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); >> + if (!i2c_mux) { >> + dev_err(dev, "Failed to find i2c-mux node\n"); >> + of_node_put(dev->of_node); >> + return -EINVAL; >> + } >> + >> + /* Identify which i2c-mux channels are enabled */ >> + for_each_child_of_node(i2c_mux, node) { >> + u32 id = 0; >> + >> + of_property_read_u32(node, "reg", &id); >> + if (id >= MAX9286_NUM_GMSL) >> + continue; >> + >> + if (!of_device_is_available(node)) { >> + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); >> + continue; >> + } >> + >> + i2c_mux_mask |= BIT(id); >> + } >> + of_node_put(node); >> + of_node_put(i2c_mux); >> + >> + /* Parse the endpoints */ >> + for_each_endpoint_of_node(dev->of_node, node) { >> + struct max9286_source *source; >> + struct of_endpoint ep; >> + >> + of_graph_parse_endpoint(node, &ep); >> + dev_dbg(dev, "Endpoint %pOF on port %d", >> + ep.local_node, ep.port); >> + >> + if (ep.port > MAX9286_NUM_GMSL) { >> + dev_err(dev, "Invalid endpoint %s on port %d", >> + of_node_full_name(ep.local_node), ep.port); >> + continue; >> + } >> + >> + /* For the source endpoint just parse the bus configuration. */ >> + if (ep.port == MAX9286_SRC_PAD) { >> + struct v4l2_fwnode_endpoint vep = { >> + .bus_type = V4L2_MBUS_CSI2_DPHY >> + }; >> + int ret; >> + >> + ret = v4l2_fwnode_endpoint_parse( >> + of_fwnode_handle(node), &vep); >> + if (ret) { >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + return ret; >> + } >> + >> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { > > This won't happen, the bus type will stay if you set it to a non-zero > value. Ok - I'll remove this check. > >> + dev_err(dev, >> + "Media bus %u type not supported\n", >> + vep.bus_type); >> + v4l2_fwnode_endpoint_free(&vep); >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + return -EINVAL; >> + } >> + >> + priv->csi2_data_lanes = >> + vep.bus.mipi_csi2.num_data_lanes; >> + v4l2_fwnode_endpoint_free(&vep); > > No need to call this unless you use v4l2_fwnode_endpoint_alloc_parse(). > > And as you don't, you also won't know which frequencies are known to be > safe to use. That said, perhaps where this device is used having a random > frequency on that bus could not be an issue. Perhaps. Does this generate a range? or a list of static supported frequencies? We configure the pixel clock based upon the number of cameras connected, and their pixel rates etc ... Are you saying that the frequency of this clock should be validated to be a specific range? or are you talking about a different frequency? For now I'll remove the v4l2_fwnode_endpoint_alloc_parse(). >> + >> + continue; >> + } >> + >> + /* Skip if the corresponding GMSL link is unavailable. */ >> + if (!(i2c_mux_mask & BIT(ep.port))) >> + continue; >> + >> + if (priv->sources[ep.port].fwnode) { >> + dev_err(dev, >> + "Multiple port endpoints are not supported: %d", >> + ep.port); >> + >> + continue; >> + } >> + >> + source = &priv->sources[ep.port]; >> + source->fwnode = fwnode_graph_get_remote_endpoint( >> + of_fwnode_handle(node)); >> + if (!source->fwnode) { >> + dev_err(dev, >> + "Endpoint %pOF has no remote endpoint connection\n", >> + ep.local_node); >> + >> + continue; >> + } >> + >> + priv->source_mask |= BIT(ep.port); >> + priv->nsources++; >> + } >> + of_node_put(node); >> + of_node_put(dev->of_node); >> + >> + priv->route_mask = priv->source_mask; >> + >> + return 0; >> +} >
Hi Kieran, Sakari On Mon, May 18, 2020 at 12:45:18PM +0100, Kieran Bingham wrote: > Hi Sakari, > > There are only fairly minor comments here, fix ups will be included in a > v10. > > Is there anything major blocking integration? > > Regards > > Kieran > > > > On 16/05/2020 22:51, Sakari Ailus wrote: > > Hi Kieran, > > > > Thanks for the update. > > > > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > > > > ... > > > >> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > >> + struct v4l2_subdev_pad_config *cfg, > >> + struct v4l2_subdev_mbus_code_enum *code) > >> +{ > >> + if (code->pad || code->index > 0) > >> + return -EINVAL; > >> + > >> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; > > > > Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel > > variant of the format is generally used on the serial busses. This choice > > was made when serial busses were introduced. > > Ok - I presume this doesn't really have much effect anyway, they just > have to match for the transmitter/receiver? > > But it makes sense to me, so I'll update to the 1x16 variant. > > >> + > >> + return 0; > >> +} > >> + > >> +static struct v4l2_mbus_framefmt * > >> +max9286_get_pad_format(struct max9286_priv *priv, > >> + struct v4l2_subdev_pad_config *cfg, > >> + unsigned int pad, u32 which) > >> +{ > >> + switch (which) { > >> + case V4L2_SUBDEV_FORMAT_TRY: > >> + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); > >> + case V4L2_SUBDEV_FORMAT_ACTIVE: > >> + return &priv->fmt[pad]; > >> + default: > >> + return NULL; > >> + } > >> +} > >> + > >> +static int max9286_set_fmt(struct v4l2_subdev *sd, > >> + struct v4l2_subdev_pad_config *cfg, > >> + struct v4l2_subdev_format *format) > >> +{ > >> + struct max9286_priv *priv = sd_to_max9286(sd); > >> + struct v4l2_mbus_framefmt *cfg_fmt; > >> + > >> + if (format->pad >= MAX9286_SRC_PAD) > >> + return -EINVAL; > > > > You can remove these checks; it's been already done by the caller. > > > > Ok. > I think this shold be kept. The core validates that the pad number is valid, but we're here checking that set_fmt has been called on a sink pad [0-3], returning -EINVAL if set_fmt (and get_ftm as well) are called on the source one. My question now is how does link validation work, if get_fmt() is not allowed on the source pad :/ ? Anyway, I would keep this check for set_fmt (maybe make it an == to address Sakari's comment). Thanks j > > > ... > > > >> +static int max9286_parse_dt(struct max9286_priv *priv) > >> +{ > >> + struct device *dev = &priv->client->dev; > >> + struct device_node *i2c_mux; > >> + struct device_node *node = NULL; > >> + unsigned int i2c_mux_mask = 0; > >> + > >> + of_node_get(dev->of_node); > >> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > >> + if (!i2c_mux) { > >> + dev_err(dev, "Failed to find i2c-mux node\n"); > >> + of_node_put(dev->of_node); > >> + return -EINVAL; > >> + } > >> + > >> + /* Identify which i2c-mux channels are enabled */ > >> + for_each_child_of_node(i2c_mux, node) { > >> + u32 id = 0; > >> + > >> + of_property_read_u32(node, "reg", &id); > >> + if (id >= MAX9286_NUM_GMSL) > >> + continue; > >> + > >> + if (!of_device_is_available(node)) { > >> + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); > >> + continue; > >> + } > >> + > >> + i2c_mux_mask |= BIT(id); > >> + } > >> + of_node_put(node); > >> + of_node_put(i2c_mux); > >> + > >> + /* Parse the endpoints */ > >> + for_each_endpoint_of_node(dev->of_node, node) { > >> + struct max9286_source *source; > >> + struct of_endpoint ep; > >> + > >> + of_graph_parse_endpoint(node, &ep); > >> + dev_dbg(dev, "Endpoint %pOF on port %d", > >> + ep.local_node, ep.port); > >> + > >> + if (ep.port > MAX9286_NUM_GMSL) { > >> + dev_err(dev, "Invalid endpoint %s on port %d", > >> + of_node_full_name(ep.local_node), ep.port); > >> + continue; > >> + } > >> + > >> + /* For the source endpoint just parse the bus configuration. */ > >> + if (ep.port == MAX9286_SRC_PAD) { > >> + struct v4l2_fwnode_endpoint vep = { > >> + .bus_type = V4L2_MBUS_CSI2_DPHY > >> + }; > >> + int ret; > >> + > >> + ret = v4l2_fwnode_endpoint_parse( > >> + of_fwnode_handle(node), &vep); > >> + if (ret) { > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + return ret; > >> + } > >> + > >> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { > > > > This won't happen, the bus type will stay if you set it to a non-zero > > value. > > > Ok - I'll remove this check. > > > > > >> + dev_err(dev, > >> + "Media bus %u type not supported\n", > >> + vep.bus_type); > >> + v4l2_fwnode_endpoint_free(&vep); > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + return -EINVAL; > >> + } > >> + > >> + priv->csi2_data_lanes = > >> + vep.bus.mipi_csi2.num_data_lanes; > >> + v4l2_fwnode_endpoint_free(&vep); > > > > No need to call this unless you use v4l2_fwnode_endpoint_alloc_parse(). > > > > And as you don't, you also won't know which frequencies are known to be > > safe to use. That said, perhaps where this device is used having a random > > frequency on that bus could not be an issue. Perhaps. > > Does this generate a range? or a list of static supported frequencies? > > We configure the pixel clock based upon the number of cameras connected, > and their pixel rates etc ... > > Are you saying that the frequency of this clock should be validated to > be a specific range? or are you talking about a different frequency? > > > For now I'll remove the v4l2_fwnode_endpoint_alloc_parse(). > > > > >> + > >> + continue; > >> + } > >> + > >> + /* Skip if the corresponding GMSL link is unavailable. */ > >> + if (!(i2c_mux_mask & BIT(ep.port))) > >> + continue; > >> + > >> + if (priv->sources[ep.port].fwnode) { > >> + dev_err(dev, > >> + "Multiple port endpoints are not supported: %d", > >> + ep.port); > >> + > >> + continue; > >> + } > >> + > >> + source = &priv->sources[ep.port]; > >> + source->fwnode = fwnode_graph_get_remote_endpoint( > >> + of_fwnode_handle(node)); > >> + if (!source->fwnode) { > >> + dev_err(dev, > >> + "Endpoint %pOF has no remote endpoint connection\n", > >> + ep.local_node); > >> + > >> + continue; > >> + } > >> + > >> + priv->source_mask |= BIT(ep.port); > >> + priv->nsources++; > >> + } > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + > >> + priv->route_mask = priv->source_mask; > >> + > >> + return 0; > >> +} > > >
Hi Jacopo, Sakari, On 18/05/2020 13:38, Jacopo Mondi wrote: > Hi Kieran, Sakari > > On Mon, May 18, 2020 at 12:45:18PM +0100, Kieran Bingham wrote: >> Hi Sakari, >> >> There are only fairly minor comments here, fix ups will be included in a >> v10. >> >> Is there anything major blocking integration? >> >> Regards >> >> Kieran >> >> >> >> On 16/05/2020 22:51, Sakari Ailus wrote: >>> Hi Kieran, >>> >>> Thanks for the update. >>> >>> On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: >>> >>> ... >>> >>>> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, >>>> + struct v4l2_subdev_pad_config *cfg, >>>> + struct v4l2_subdev_mbus_code_enum *code) >>>> +{ >>>> + if (code->pad || code->index > 0) >>>> + return -EINVAL; >>>> + >>>> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; >>> >>> Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel >>> variant of the format is generally used on the serial busses. This choice >>> was made when serial busses were introduced. >> >> Ok - I presume this doesn't really have much effect anyway, they just >> have to match for the transmitter/receiver? >> >> But it makes sense to me, so I'll update to the 1x16 variant. >> >>>> + >>>> + return 0; >>>> +} >>>> + >>>> +static struct v4l2_mbus_framefmt * >>>> +max9286_get_pad_format(struct max9286_priv *priv, >>>> + struct v4l2_subdev_pad_config *cfg, >>>> + unsigned int pad, u32 which) >>>> +{ >>>> + switch (which) { >>>> + case V4L2_SUBDEV_FORMAT_TRY: >>>> + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); >>>> + case V4L2_SUBDEV_FORMAT_ACTIVE: >>>> + return &priv->fmt[pad]; >>>> + default: >>>> + return NULL; >>>> + } >>>> +} >>>> + >>>> +static int max9286_set_fmt(struct v4l2_subdev *sd, >>>> + struct v4l2_subdev_pad_config *cfg, >>>> + struct v4l2_subdev_format *format) >>>> +{ >>>> + struct max9286_priv *priv = sd_to_max9286(sd); >>>> + struct v4l2_mbus_framefmt *cfg_fmt; >>>> + >>>> + if (format->pad >= MAX9286_SRC_PAD) >>>> + return -EINVAL; >>> >>> You can remove these checks; it's been already done by the caller. >>> >> >> Ok. >> > > I think this shold be kept. The core validates that the pad number is > valid, but we're here checking that set_fmt has been called on a sink > pad [0-3], returning -EINVAL if set_fmt (and get_ftm as well) are > called on the source one. > Indeed, this is actually preventing get/set format on the intermediate (multiplexed) stream. But it is "breaking" link validation (or preventing it from happening maybe?), which is defaulting 'open' ... that might be a problem we need to look at, but as we don't have a real multiplexed stream support implementation then that's perhaps more difficult to give a 'correct' answer. > My question now is how does link validation work, if get_fmt() is not > allowed on the source pad :/ ? Anyway, I would keep this check for > set_fmt (maybe make it an == to address Sakari's comment). Ok - so as long as we return -EINVAL for the MAX9286_SRC_PAD, then v4l2_subdev_link_validate() will fail on v4l2_subdev_link_validate_get_format() for that pad, which causes a return 0 (v4l2_subdev_link_validate defaulting to success if it can't get both pads) We could convert this to: /* * \todo: Prevent validation of the source pad, as it represents a * multiplexed stream, and we do not have multiplexed stream support in * V4L2 yet. */ if (format->pad == MAX9286_SRC_PAD) Or we could call this a blocker. Which will make me sad, as I really want to be able to have a baseline for development for this driver, but I've been calling out for "What blockers prevent this driver from being merged" since February so if this is it - so be it... Sakari - is this a blocking issue for you? Or can we consider this a topic that we (already know) needs visiting as part of V4L2 Multiplexed stream support. We already know of course that this driver is taking liberties due to the lack of multiplexed stream support, and requires the receiver to assume that each camera is on a different (consecutive?) VC. Or perhaps - to enforce validation, we could have the get_fmt call pass on the bus format of the first camera link ? Thoughts anyone? > > Thanks > j > >> >>> ... >>> >>>> +static int max9286_parse_dt(struct max9286_priv *priv) >>>> +{ >>>> + struct device *dev = &priv->client->dev; >>>> + struct device_node *i2c_mux; >>>> + struct device_node *node = NULL; >>>> + unsigned int i2c_mux_mask = 0; >>>> + >>>> + of_node_get(dev->of_node); >>>> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); >>>> + if (!i2c_mux) { >>>> + dev_err(dev, "Failed to find i2c-mux node\n"); >>>> + of_node_put(dev->of_node); >>>> + return -EINVAL; >>>> + } >>>> + >>>> + /* Identify which i2c-mux channels are enabled */ >>>> + for_each_child_of_node(i2c_mux, node) { >>>> + u32 id = 0; >>>> + >>>> + of_property_read_u32(node, "reg", &id); >>>> + if (id >= MAX9286_NUM_GMSL) >>>> + continue; >>>> + >>>> + if (!of_device_is_available(node)) { >>>> + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); >>>> + continue; >>>> + } >>>> + >>>> + i2c_mux_mask |= BIT(id); >>>> + } >>>> + of_node_put(node); >>>> + of_node_put(i2c_mux); >>>> + >>>> + /* Parse the endpoints */ >>>> + for_each_endpoint_of_node(dev->of_node, node) { >>>> + struct max9286_source *source; >>>> + struct of_endpoint ep; >>>> + >>>> + of_graph_parse_endpoint(node, &ep); >>>> + dev_dbg(dev, "Endpoint %pOF on port %d", >>>> + ep.local_node, ep.port); >>>> + >>>> + if (ep.port > MAX9286_NUM_GMSL) { >>>> + dev_err(dev, "Invalid endpoint %s on port %d", >>>> + of_node_full_name(ep.local_node), ep.port); >>>> + continue; >>>> + } >>>> + >>>> + /* For the source endpoint just parse the bus configuration. */ >>>> + if (ep.port == MAX9286_SRC_PAD) { >>>> + struct v4l2_fwnode_endpoint vep = { >>>> + .bus_type = V4L2_MBUS_CSI2_DPHY >>>> + }; >>>> + int ret; >>>> + >>>> + ret = v4l2_fwnode_endpoint_parse( >>>> + of_fwnode_handle(node), &vep); >>>> + if (ret) { >>>> + of_node_put(node); >>>> + of_node_put(dev->of_node); >>>> + return ret; >>>> + } >>>> + >>>> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { >>> >>> This won't happen, the bus type will stay if you set it to a non-zero >>> value. >> >> >> Ok - I'll remove this check. >> >> >>> >>>> + dev_err(dev, >>>> + "Media bus %u type not supported\n", >>>> + vep.bus_type); >>>> + v4l2_fwnode_endpoint_free(&vep); >>>> + of_node_put(node); >>>> + of_node_put(dev->of_node); >>>> + return -EINVAL; >>>> + } >>>> + >>>> + priv->csi2_data_lanes = >>>> + vep.bus.mipi_csi2.num_data_lanes; >>>> + v4l2_fwnode_endpoint_free(&vep); >>> >>> No need to call this unless you use v4l2_fwnode_endpoint_alloc_parse(). >>> >>> And as you don't, you also won't know which frequencies are known to be >>> safe to use. That said, perhaps where this device is used having a random >>> frequency on that bus could not be an issue. Perhaps. >> >> Does this generate a range? or a list of static supported frequencies? >> >> We configure the pixel clock based upon the number of cameras connected, >> and their pixel rates etc ... >> >> Are you saying that the frequency of this clock should be validated to >> be a specific range? or are you talking about a different frequency? >> >> >> For now I'll remove the v4l2_fwnode_endpoint_alloc_parse(). >> >> >> >>>> + >>>> + continue; >>>> + } >>>> + >>>> + /* Skip if the corresponding GMSL link is unavailable. */ >>>> + if (!(i2c_mux_mask & BIT(ep.port))) >>>> + continue; >>>> + >>>> + if (priv->sources[ep.port].fwnode) { >>>> + dev_err(dev, >>>> + "Multiple port endpoints are not supported: %d", >>>> + ep.port); >>>> + >>>> + continue; >>>> + } >>>> + >>>> + source = &priv->sources[ep.port]; >>>> + source->fwnode = fwnode_graph_get_remote_endpoint( >>>> + of_fwnode_handle(node)); >>>> + if (!source->fwnode) { >>>> + dev_err(dev, >>>> + "Endpoint %pOF has no remote endpoint connection\n", >>>> + ep.local_node); >>>> + >>>> + continue; >>>> + } >>>> + >>>> + priv->source_mask |= BIT(ep.port); >>>> + priv->nsources++; >>>> + } >>>> + of_node_put(node); >>>> + of_node_put(dev->of_node); >>>> + >>>> + priv->route_mask = priv->source_mask; >>>> + >>>> + return 0; >>>> +} >>> >>
Hi Kieran, On Mon, May 18, 2020 at 12:45:18PM +0100, Kieran Bingham wrote: > Hi Sakari, > > There are only fairly minor comments here, fix ups will be included in a > v10. > > Is there anything major blocking integration? Not that I can see. But please see my comments below. > > Regards > > Kieran > > > > On 16/05/2020 22:51, Sakari Ailus wrote: > > Hi Kieran, > > > > Thanks for the update. > > > > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > > > > ... > > > >> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > >> + struct v4l2_subdev_pad_config *cfg, > >> + struct v4l2_subdev_mbus_code_enum *code) > >> +{ > >> + if (code->pad || code->index > 0) > >> + return -EINVAL; > >> + > >> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; > > > > Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel > > variant of the format is generally used on the serial busses. This choice > > was made when serial busses were introduced. > > Ok - I presume this doesn't really have much effect anyway, they just > have to match for the transmitter/receiver? In this case, yes. But it's harder to change later, so let's indeed do that now. > > But it makes sense to me, so I'll update to the 1x16 variant. ... > > > And as you don't, you also won't know which frequencies are known to be > > safe to use. That said, perhaps where this device is used having a random > > frequency on that bus could not be an issue. Perhaps. > > Does this generate a range? or a list of static supported frequencies? > > We configure the pixel clock based upon the number of cameras connected, > and their pixel rates etc ... > > Are you saying that the frequency of this clock should be validated to > be a specific range? or are you talking about a different frequency? It depends on the system. In general, only frequencies known to be safe should be used. If this one has enough shielding to guarantee there won't be problems in using a random frequency in the entire range, is there a guarantee that will be the case for all systems with this chip?
Hi Sakari, On 19/05/2020 09:10, Sakari Ailus wrote: > Hi Kieran, > > On Mon, May 18, 2020 at 12:45:18PM +0100, Kieran Bingham wrote: >> Hi Sakari, >> >> There are only fairly minor comments here, fix ups will be included in a >> v10. >> >> Is there anything major blocking integration? > > Not that I can see. But please see my comments below. Thanks, We might have some more work tidying up the DT validation anyway which has come too late, and perhaps is going to bump this to v5.9 now anyway. I can still try but ... ;-S At least hopefully now we /can/ see a path to integration though. I probably don't care if it's 5.8 or 5.9 as long as it's not 8.5 ;-) >> >> Regards >> >> Kieran >> >> >> >> On 16/05/2020 22:51, Sakari Ailus wrote: >>> Hi Kieran, >>> >>> Thanks for the update. >>> >>> On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: >>> >>> ... >>> >>>> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, >>>> + struct v4l2_subdev_pad_config *cfg, >>>> + struct v4l2_subdev_mbus_code_enum *code) >>>> +{ >>>> + if (code->pad || code->index > 0) >>>> + return -EINVAL; >>>> + >>>> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; >>> >>> Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel >>> variant of the format is generally used on the serial busses. This choice >>> was made when serial busses were introduced. >> >> Ok - I presume this doesn't really have much effect anyway, they just >> have to match for the transmitter/receiver? > > In this case, yes. But it's harder to change later, so let's indeed do that > now. Yes indeed, I have to change my test scripts for the new configuration (or we should update the scripts to get the configuration from the device ;D) >> But it makes sense to me, so I'll update to the 1x16 variant. > > ... done anyway ;-) I see the ADV748x is using the 2x8 variants though ... (all the more reason for our scripts to /get/ the correct version when propagating formats). Perhaps I should/could add the 1x16 formats to the ADV748x too. (later) >>> And as you don't, you also won't know which frequencies are known to be >>> safe to use. That said, perhaps where this device is used having a random >>> frequency on that bus could not be an issue. Perhaps. >> >> Does this generate a range? or a list of static supported frequencies? >> >> We configure the pixel clock based upon the number of cameras connected, >> and their pixel rates etc ... >> >> Are you saying that the frequency of this clock should be validated to >> be a specific range? or are you talking about a different frequency? > > It depends on the system. In general, only frequencies known to be safe > should be used. If this one has enough shielding to guarantee there won't > be problems in using a random frequency in the entire range, is there a > guarantee that will be the case for all systems with this chip? I have no idea here... Maybe Niklas knows more having dealt more with the RCar-VIN/CSI parts. It seems like this is something we can add later if necessary, by extending the descriptions in the DT? -- Kieran
Hi Kieran, On Tue, May 19, 2020 at 09:55:24AM +0100, Kieran Bingham wrote: > Hi Sakari, > > On 19/05/2020 09:10, Sakari Ailus wrote: > > Hi Kieran, > > > > On Mon, May 18, 2020 at 12:45:18PM +0100, Kieran Bingham wrote: > >> Hi Sakari, > >> > >> There are only fairly minor comments here, fix ups will be included in a > >> v10. > >> > >> Is there anything major blocking integration? > > > > Not that I can see. But please see my comments below. > > Thanks, > > We might have some more work tidying up the DT validation anyway which > has come too late, and perhaps is going to bump this to v5.9 now anyway. > > I can still try but ... ;-S > > At least hopefully now we /can/ see a path to integration though. > > I probably don't care if it's 5.8 or 5.9 as long as it's not 8.5 ;-) > > >> > >> Regards > >> > >> Kieran > >> > >> > >> > >> On 16/05/2020 22:51, Sakari Ailus wrote: > >>> Hi Kieran, > >>> > >>> Thanks for the update. > >>> > >>> On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > >>> > >>> ... > >>> > >>>> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > >>>> + struct v4l2_subdev_pad_config *cfg, > >>>> + struct v4l2_subdev_mbus_code_enum *code) > >>>> +{ > >>>> + if (code->pad || code->index > 0) > >>>> + return -EINVAL; > >>>> + > >>>> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; > >>> > >>> Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel > >>> variant of the format is generally used on the serial busses. This choice > >>> was made when serial busses were introduced. > >> > >> Ok - I presume this doesn't really have much effect anyway, they just > >> have to match for the transmitter/receiver? > > > > In this case, yes. But it's harder to change later, so let's indeed do that > > now. > > Yes indeed, I have to change my test scripts for the new configuration > (or we should update the scripts to get the configuration from the > device ;D) > > > >> But it makes sense to me, so I'll update to the 1x16 variant. > > > > ... > > done anyway ;-) > > I see the ADV748x is using the 2x8 variants though ... (all the more > reason for our scripts to /get/ the correct version when propagating > formats). > > Perhaps I should/could add the 1x16 formats to the ADV748x too. (later) It's a driver bug, yes. > > > >>> And as you don't, you also won't know which frequencies are known to be > >>> safe to use. That said, perhaps where this device is used having a random > >>> frequency on that bus could not be an issue. Perhaps. > >> > >> Does this generate a range? or a list of static supported frequencies? > >> > >> We configure the pixel clock based upon the number of cameras connected, > >> and their pixel rates etc ... > >> > >> Are you saying that the frequency of this clock should be validated to > >> be a specific range? or are you talking about a different frequency? > > > > It depends on the system. In general, only frequencies known to be safe > > should be used. If this one has enough shielding to guarantee there won't > > be problems in using a random frequency in the entire range, is there a > > guarantee that will be the case for all systems with this chip? > > I have no idea here... Maybe Niklas knows more having dealt more with > the RCar-VIN/CSI parts. > > It seems like this is something we can add later if necessary, by > extending the descriptions in the DT? Works for me. Niklas, any idea?
Hi Sakari, On Mon, May 18, 2020 at 12:45:18PM +0100, Kieran Bingham wrote: > Hi Sakari, > > There are only fairly minor comments here, fix ups will be included in a > v10. > > Is there anything major blocking integration? > > On 16/05/2020 22:51, Sakari Ailus wrote: > > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > > > > ... > > > >> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > >> + struct v4l2_subdev_pad_config *cfg, > >> + struct v4l2_subdev_mbus_code_enum *code) > >> +{ > >> + if (code->pad || code->index > 0) > >> + return -EINVAL; > >> + > >> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; > > > > Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel > > variant of the format is generally used on the serial busses. This choice > > was made when serial busses were introduced. This is a bit of a tricky one. On the camera size, for the RDACM20, the O10635 sensor outputs UYVY8_2X8. This if fed to the MAX9271 serializer, which doesn't care about the data type. The MAX9271 has a 16-bit input bus, with 10 bits reserved for data, 2 bits dynamically configurable to carry H/V sync or extra data, and 4 bits dynamically configurable to carry GPIOs or extra data. The 16-bit words are then serialized (it's a bit more complicated, when using the H/V sync signals they are transmitted in a different way, and the MAX9271 also supports a DDR mode that makes the "serial link word" carry up to 30 bits). Effectively, the two samples of UYVY8_2X8 are serialized in a 16-bit word each. Sakari, with this information in mind, what would you recommend ? > Ok - I presume this doesn't really have much effect anyway, they just > have to match for the transmitter/receiver? > > But it makes sense to me, so I'll update to the 1x16 variant. > > >> + > >> + return 0; > >> +} > >> + > >> +static struct v4l2_mbus_framefmt * > >> +max9286_get_pad_format(struct max9286_priv *priv, > >> + struct v4l2_subdev_pad_config *cfg, > >> + unsigned int pad, u32 which) > >> +{ > >> + switch (which) { > >> + case V4L2_SUBDEV_FORMAT_TRY: > >> + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); > >> + case V4L2_SUBDEV_FORMAT_ACTIVE: > >> + return &priv->fmt[pad]; > >> + default: > >> + return NULL; > >> + } > >> +} > >> + > >> +static int max9286_set_fmt(struct v4l2_subdev *sd, > >> + struct v4l2_subdev_pad_config *cfg, > >> + struct v4l2_subdev_format *format) > >> +{ > >> + struct max9286_priv *priv = sd_to_max9286(sd); > >> + struct v4l2_mbus_framefmt *cfg_fmt; > >> + > >> + if (format->pad >= MAX9286_SRC_PAD) > >> + return -EINVAL; > > > > You can remove these checks; it's been already done by the caller. > > > > Ok. > > > > ... > > > >> +static int max9286_parse_dt(struct max9286_priv *priv) > >> +{ > >> + struct device *dev = &priv->client->dev; > >> + struct device_node *i2c_mux; > >> + struct device_node *node = NULL; > >> + unsigned int i2c_mux_mask = 0; > >> + > >> + of_node_get(dev->of_node); > >> + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); > >> + if (!i2c_mux) { > >> + dev_err(dev, "Failed to find i2c-mux node\n"); > >> + of_node_put(dev->of_node); > >> + return -EINVAL; > >> + } > >> + > >> + /* Identify which i2c-mux channels are enabled */ > >> + for_each_child_of_node(i2c_mux, node) { > >> + u32 id = 0; > >> + > >> + of_property_read_u32(node, "reg", &id); > >> + if (id >= MAX9286_NUM_GMSL) > >> + continue; > >> + > >> + if (!of_device_is_available(node)) { > >> + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); > >> + continue; > >> + } > >> + > >> + i2c_mux_mask |= BIT(id); > >> + } > >> + of_node_put(node); > >> + of_node_put(i2c_mux); > >> + > >> + /* Parse the endpoints */ > >> + for_each_endpoint_of_node(dev->of_node, node) { > >> + struct max9286_source *source; > >> + struct of_endpoint ep; > >> + > >> + of_graph_parse_endpoint(node, &ep); > >> + dev_dbg(dev, "Endpoint %pOF on port %d", > >> + ep.local_node, ep.port); > >> + > >> + if (ep.port > MAX9286_NUM_GMSL) { > >> + dev_err(dev, "Invalid endpoint %s on port %d", > >> + of_node_full_name(ep.local_node), ep.port); > >> + continue; > >> + } > >> + > >> + /* For the source endpoint just parse the bus configuration. */ > >> + if (ep.port == MAX9286_SRC_PAD) { > >> + struct v4l2_fwnode_endpoint vep = { > >> + .bus_type = V4L2_MBUS_CSI2_DPHY > >> + }; > >> + int ret; > >> + > >> + ret = v4l2_fwnode_endpoint_parse( > >> + of_fwnode_handle(node), &vep); > >> + if (ret) { > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + return ret; > >> + } > >> + > >> + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { > > > > This won't happen, the bus type will stay if you set it to a non-zero > > value. > > > Ok - I'll remove this check. > > > > > >> + dev_err(dev, > >> + "Media bus %u type not supported\n", > >> + vep.bus_type); > >> + v4l2_fwnode_endpoint_free(&vep); > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + return -EINVAL; > >> + } > >> + > >> + priv->csi2_data_lanes = > >> + vep.bus.mipi_csi2.num_data_lanes; > >> + v4l2_fwnode_endpoint_free(&vep); > > > > No need to call this unless you use v4l2_fwnode_endpoint_alloc_parse(). > > > > And as you don't, you also won't know which frequencies are known to be > > safe to use. That said, perhaps where this device is used having a random > > frequency on that bus could not be an issue. Perhaps. > > Does this generate a range? or a list of static supported frequencies? > > We configure the pixel clock based upon the number of cameras connected, > and their pixel rates etc ... > > Are you saying that the frequency of this clock should be validated to > be a specific range? or are you talking about a different frequency? > > > For now I'll remove the v4l2_fwnode_endpoint_alloc_parse(). > > > > >> + > >> + continue; > >> + } > >> + > >> + /* Skip if the corresponding GMSL link is unavailable. */ > >> + if (!(i2c_mux_mask & BIT(ep.port))) > >> + continue; > >> + > >> + if (priv->sources[ep.port].fwnode) { > >> + dev_err(dev, > >> + "Multiple port endpoints are not supported: %d", > >> + ep.port); > >> + > >> + continue; > >> + } > >> + > >> + source = &priv->sources[ep.port]; > >> + source->fwnode = fwnode_graph_get_remote_endpoint( > >> + of_fwnode_handle(node)); > >> + if (!source->fwnode) { > >> + dev_err(dev, > >> + "Endpoint %pOF has no remote endpoint connection\n", > >> + ep.local_node); > >> + > >> + continue; > >> + } > >> + > >> + priv->source_mask |= BIT(ep.port); > >> + priv->nsources++; > >> + } > >> + of_node_put(node); > >> + of_node_put(dev->of_node); > >> + > >> + priv->route_mask = priv->source_mask; > >> + > >> + return 0; > >> +} > > >
Hi Laurent, On Wed, May 20, 2020 at 03:50:20AM +0300, Laurent Pinchart wrote: > Hi Sakari, > > On Mon, May 18, 2020 at 12:45:18PM +0100, Kieran Bingham wrote: > > Hi Sakari, > > > > There are only fairly minor comments here, fix ups will be included in a > > v10. > > > > Is there anything major blocking integration? > > > > On 16/05/2020 22:51, Sakari Ailus wrote: > > > On Tue, May 12, 2020 at 04:51:03PM +0100, Kieran Bingham wrote: > > > > > > ... > > > > > >> +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, > > >> + struct v4l2_subdev_pad_config *cfg, > > >> + struct v4l2_subdev_mbus_code_enum *code) > > >> +{ > > >> + if (code->pad || code->index > 0) > > >> + return -EINVAL; > > >> + > > >> + code->code = MEDIA_BUS_FMT_UYVY8_2X8; > > > > > > Why UYVY8_2X8 and not UYVY8_1X16? In general, the single sample / pixel > > > variant of the format is generally used on the serial busses. This choice > > > was made when serial busses were introduced. > > This is a bit of a tricky one. On the camera size, for the RDACM20, the > O10635 sensor outputs UYVY8_2X8. This if fed to the MAX9271 serializer, > which doesn't care about the data type. The MAX9271 has a 16-bit input > bus, with 10 bits reserved for data, 2 bits dynamically configurable > to carry H/V sync or extra data, and 4 bits dynamically configurable to > carry GPIOs or extra data. The 16-bit words are then serialized (it's a > bit more complicated, when using the H/V sync signals they are > transmitted in a different way, and the MAX9271 also supports a DDR mode > that makes the "serial link word" carry up to 30 bits). Effectively, the > two samples of UYVY8_2X8 are serialized in a 16-bit word each. > > Sakari, with this information in mind, what would you recommend ? As this pad describes a serial bus --- doesn't it? --- it should use the same formats as other serial busses such as CSI-2. I.e. the 1X16 variant.
diff --git a/MAINTAINERS b/MAINTAINERS index a7bb6e22d5da..99e3bf7760fd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10274,6 +10274,16 @@ F: Documentation/hwmon/max6697.rst F: drivers/hwmon/max6697.c F: include/linux/platform_data/max6697.h +MAX9286 QUAD GMSL DESERIALIZER DRIVER +M: Jacopo Mondi <jacopo+renesas@jmondi.org> +M: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> +M: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> +M: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> +L: linux-media@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml +F: drivers/media/i2c/max9286.c + MAX9860 MONO AUDIO VOICE CODEC DRIVER M: Peter Rosin <peda@axentia.se> L: alsa-devel@alsa-project.org (moderated for non-subscribers) diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index 3abc80373ec0..2e390f41f6da 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -464,6 +464,19 @@ config VIDEO_VPX3220 To compile this driver as a module, choose M here: the module will be called vpx3220. +config VIDEO_MAX9286 + tristate "Maxim MAX9286 GMSL deserializer support" + depends on I2C && I2C_MUX + depends on OF + select V4L2_FWNODE + select VIDEO_V4L2_SUBDEV_API + select MEDIA_CONTROLLER + help + This driver supports the Maxim MAX9286 GMSL deserializer. + + To compile this driver as a module, choose M here: the + module will be called max9286. + comment "Video and audio decoders" config VIDEO_SAA717X diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile index 77bf7d0b691f..f0b001ee4b05 100644 --- a/drivers/media/i2c/Makefile +++ b/drivers/media/i2c/Makefile @@ -117,6 +117,7 @@ obj-$(CONFIG_VIDEO_IMX274) += imx274.o obj-$(CONFIG_VIDEO_IMX290) += imx290.o obj-$(CONFIG_VIDEO_IMX319) += imx319.o obj-$(CONFIG_VIDEO_IMX355) += imx355.o +obj-$(CONFIG_VIDEO_MAX9286) += max9286.o obj-$(CONFIG_VIDEO_ST_MIPID02) += st-mipid02.o obj-$(CONFIG_SDR_MAX2175) += max2175.o diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c new file mode 100644 index 000000000000..481d65f2b51d --- /dev/null +++ b/drivers/media/i2c/max9286.c @@ -0,0 +1,1332 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Maxim MAX9286 GMSL Deserializer Driver + * + * Copyright (C) 2017-2019 Jacopo Mondi + * Copyright (C) 2017-2019 Kieran Bingham + * Copyright (C) 2017-2019 Laurent Pinchart + * Copyright (C) 2017-2019 Niklas Söderlund + * Copyright (C) 2016 Renesas Electronics Corporation + * Copyright (C) 2015 Cogent Embedded, Inc. + */ + +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/fwnode.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio/driver.h> +#include <linux/i2c.h> +#include <linux/i2c-mux.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of_graph.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> + +#include <media/v4l2-async.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-device.h> +#include <media/v4l2-fwnode.h> +#include <media/v4l2-subdev.h> + +/* Register 0x00 */ +#define MAX9286_MSTLINKSEL_AUTO (7 << 5) +#define MAX9286_MSTLINKSEL(n) ((n) << 5) +#define MAX9286_EN_VS_GEN BIT(4) +#define MAX9286_LINKEN(n) (1 << (n)) +/* Register 0x01 */ +#define MAX9286_FSYNCMODE_ECU (3 << 6) +#define MAX9286_FSYNCMODE_EXT (2 << 6) +#define MAX9286_FSYNCMODE_INT_OUT (1 << 6) +#define MAX9286_FSYNCMODE_INT_HIZ (0 << 6) +#define MAX9286_GPIEN BIT(5) +#define MAX9286_ENLMO_RSTFSYNC BIT(2) +#define MAX9286_FSYNCMETH_AUTO (2 << 0) +#define MAX9286_FSYNCMETH_SEMI_AUTO (1 << 0) +#define MAX9286_FSYNCMETH_MANUAL (0 << 0) +#define MAX9286_REG_FSYNC_PERIOD_L 0x06 +#define MAX9286_REG_FSYNC_PERIOD_M 0x07 +#define MAX9286_REG_FSYNC_PERIOD_H 0x08 +/* Register 0x0a */ +#define MAX9286_FWDCCEN(n) (1 << ((n) + 4)) +#define MAX9286_REVCCEN(n) (1 << (n)) +/* Register 0x0c */ +#define MAX9286_HVEN BIT(7) +#define MAX9286_EDC_6BIT_HAMMING (2 << 5) +#define MAX9286_EDC_6BIT_CRC (1 << 5) +#define MAX9286_EDC_1BIT_PARITY (0 << 5) +#define MAX9286_DESEL BIT(4) +#define MAX9286_INVVS BIT(3) +#define MAX9286_INVHS BIT(2) +#define MAX9286_HVSRC_D0 (2 << 0) +#define MAX9286_HVSRC_D14 (1 << 0) +#define MAX9286_HVSRC_D18 (0 << 0) +/* Register 0x0f */ +#define MAX9286_0X0F_RESERVED BIT(3) +/* Register 0x12 */ +#define MAX9286_CSILANECNT(n) (((n) - 1) << 6) +#define MAX9286_CSIDBL BIT(5) +#define MAX9286_DBL BIT(4) +#define MAX9286_DATATYPE_USER_8BIT (11 << 0) +#define MAX9286_DATATYPE_USER_YUV_12BIT (10 << 0) +#define MAX9286_DATATYPE_USER_24BIT (9 << 0) +#define MAX9286_DATATYPE_RAW14 (8 << 0) +#define MAX9286_DATATYPE_RAW11 (7 << 0) +#define MAX9286_DATATYPE_RAW10 (6 << 0) +#define MAX9286_DATATYPE_RAW8 (5 << 0) +#define MAX9286_DATATYPE_YUV422_10BIT (4 << 0) +#define MAX9286_DATATYPE_YUV422_8BIT (3 << 0) +#define MAX9286_DATATYPE_RGB555 (2 << 0) +#define MAX9286_DATATYPE_RGB565 (1 << 0) +#define MAX9286_DATATYPE_RGB888 (0 << 0) +/* Register 0x15 */ +#define MAX9286_VC(n) ((n) << 5) +#define MAX9286_VCTYPE BIT(4) +#define MAX9286_CSIOUTEN BIT(3) +#define MAX9286_0X15_RESV (3 << 0) +/* Register 0x1b */ +#define MAX9286_SWITCHIN(n) (1 << ((n) + 4)) +#define MAX9286_ENEQ(n) (1 << (n)) +/* Register 0x27 */ +#define MAX9286_LOCKED BIT(7) +/* Register 0x31 */ +#define MAX9286_FSYNC_LOCKED BIT(6) +/* Register 0x34 */ +#define MAX9286_I2CLOCACK BIT(7) +#define MAX9286_I2CSLVSH_1046NS_469NS (3 << 5) +#define MAX9286_I2CSLVSH_938NS_352NS (2 << 5) +#define MAX9286_I2CSLVSH_469NS_234NS (1 << 5) +#define MAX9286_I2CSLVSH_352NS_117NS (0 << 5) +#define MAX9286_I2CMSTBT_837KBPS (7 << 2) +#define MAX9286_I2CMSTBT_533KBPS (6 << 2) +#define MAX9286_I2CMSTBT_339KBPS (5 << 2) +#define MAX9286_I2CMSTBT_173KBPS (4 << 2) +#define MAX9286_I2CMSTBT_105KBPS (3 << 2) +#define MAX9286_I2CMSTBT_84KBPS (2 << 2) +#define MAX9286_I2CMSTBT_28KBPS (1 << 2) +#define MAX9286_I2CMSTBT_8KBPS (0 << 2) +#define MAX9286_I2CSLVTO_NONE (3 << 0) +#define MAX9286_I2CSLVTO_1024US (2 << 0) +#define MAX9286_I2CSLVTO_256US (1 << 0) +#define MAX9286_I2CSLVTO_64US (0 << 0) +/* Register 0x3b */ +#define MAX9286_REV_TRF(n) ((n) << 4) +#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */ +#define MAX9286_REV_AMP_X BIT(0) +/* Register 0x3f */ +#define MAX9286_EN_REV_CFG BIT(6) +#define MAX9286_REV_FLEN(n) ((n) - 20) +/* Register 0x49 */ +#define MAX9286_VIDEO_DETECT_MASK 0x0f +/* Register 0x69 */ +#define MAX9286_LFLTBMONMASKED BIT(7) +#define MAX9286_LOCKMONMASKED BIT(6) +#define MAX9286_AUTOCOMBACKEN BIT(5) +#define MAX9286_AUTOMASKEN BIT(4) +#define MAX9286_MASKLINK(n) ((n) << 0) + +/* + * The sink and source pads are created to match the OF graph port numbers so + * that their indexes can be used interchangeably. + */ +#define MAX9286_NUM_GMSL 4 +#define MAX9286_N_SINKS 4 +#define MAX9286_N_PADS 5 +#define MAX9286_SRC_PAD 4 + +struct max9286_source { + struct v4l2_async_subdev asd; + struct v4l2_subdev *sd; + struct fwnode_handle *fwnode; +}; + +#define asd_to_max9286_source(_asd) \ + container_of(_asd, struct max9286_source, asd) + +struct max9286_priv { + struct i2c_client *client; + struct gpio_desc *gpiod_pwdn; + struct v4l2_subdev sd; + struct media_pad pads[MAX9286_N_PADS]; + struct regulator *regulator; + + struct gpio_chip gpio; + u8 gpio_state; + + struct i2c_mux_core *mux; + unsigned int mux_channel; + bool mux_open; + + struct v4l2_ctrl_handler ctrls; + struct v4l2_ctrl *pixelrate; + + struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; + + /* Protects controls and fmt structures */ + struct mutex mutex; + + unsigned int nsources; + unsigned int source_mask; + unsigned int route_mask; + unsigned int bound_sources; + unsigned int csi2_data_lanes; + struct max9286_source sources[MAX9286_NUM_GMSL]; + struct v4l2_async_notifier notifier; +}; + +static struct max9286_source *next_source(struct max9286_priv *priv, + struct max9286_source *source) +{ + if (!source) + source = &priv->sources[0]; + else + source++; + + for (; source < &priv->sources[MAX9286_NUM_GMSL]; source++) { + if (source->fwnode) + return source; + } + + return NULL; +} + +#define for_each_source(priv, source) \ + for ((source) = NULL; ((source) = next_source((priv), (source))); ) + +#define to_index(priv, source) ((source) - &(priv)->sources[0]) + +static inline struct max9286_priv *sd_to_max9286(struct v4l2_subdev *sd) +{ + return container_of(sd, struct max9286_priv, sd); +} + +/* ----------------------------------------------------------------------------- + * I2C IO + */ + +static int max9286_read(struct max9286_priv *priv, u8 reg) +{ + int ret; + + ret = i2c_smbus_read_byte_data(priv->client, reg); + if (ret < 0) + dev_err(&priv->client->dev, + "%s: register 0x%02x read failed (%d)\n", + __func__, reg, ret); + + return ret; +} + +static int max9286_write(struct max9286_priv *priv, u8 reg, u8 val) +{ + int ret; + + ret = i2c_smbus_write_byte_data(priv->client, reg, val); + if (ret < 0) + dev_err(&priv->client->dev, + "%s: register 0x%02x write failed (%d)\n", + __func__, reg, ret); + + return ret; +} + +/* ----------------------------------------------------------------------------- + * I2C Multiplexer + */ + +static void max9286_i2c_mux_configure(struct max9286_priv *priv, u8 conf) +{ + max9286_write(priv, 0x0a, conf); + + /* + * We must sleep after any change to the forward or reverse channel + * configuration. + */ + usleep_range(3000, 5000); +} + +static void max9286_i2c_mux_open(struct max9286_priv *priv) +{ + /* Open all channels on the MAX9286 */ + max9286_i2c_mux_configure(priv, 0xff); + + priv->mux_open = true; +} + +static void max9286_i2c_mux_close(struct max9286_priv *priv) +{ + /* + * Ensure that both the forward and reverse channel are disabled on the + * mux, and that the channel ID is invalidated to ensure we reconfigure + * on the next max9286_i2c_mux_select() call. + */ + max9286_i2c_mux_configure(priv, 0x00); + + priv->mux_open = false; + priv->mux_channel = -1; +} + +static int max9286_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan) +{ + struct max9286_priv *priv = i2c_mux_priv(muxc); + + /* Channel select is disabled when configured in the opened state. */ + if (priv->mux_open) + return 0; + + if (priv->mux_channel == chan) + return 0; + + priv->mux_channel = chan; + + max9286_i2c_mux_configure(priv, + MAX9286_FWDCCEN(chan) | + MAX9286_REVCCEN(chan)); + + return 0; +} + +static int max9286_i2c_mux_init(struct max9286_priv *priv) +{ + struct max9286_source *source; + int ret; + + if (!i2c_check_functionality(priv->client->adapter, + I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) + return -ENODEV; + + priv->mux = i2c_mux_alloc(priv->client->adapter, &priv->client->dev, + priv->nsources, 0, I2C_MUX_LOCKED, + max9286_i2c_mux_select, NULL); + if (!priv->mux) + return -ENOMEM; + + priv->mux->priv = priv; + + for_each_source(priv, source) { + unsigned int index = to_index(priv, source); + + ret = i2c_mux_add_adapter(priv->mux, 0, index, 0); + if (ret < 0) + goto error; + } + + return 0; + +error: + i2c_mux_del_adapters(priv->mux); + return ret; +} + +static void max9286_configure_i2c(struct max9286_priv *priv, bool localack) +{ + u8 config = MAX9286_I2CSLVSH_469NS_234NS | MAX9286_I2CSLVTO_1024US | + MAX9286_I2CMSTBT_105KBPS; + + if (localack) + config |= MAX9286_I2CLOCACK; + + max9286_write(priv, 0x34, config); + usleep_range(3000, 5000); +} + +/* + * max9286_check_video_links() - Make sure video links are detected and locked + * + * Performs safety checks on video link status. Make sure they are detected + * and all enabled links are locked. + * + * Returns 0 for success, -EIO for errors. + */ +static int max9286_check_video_links(struct max9286_priv *priv) +{ + unsigned int i; + int ret; + + /* + * Make sure valid video links are detected. + * The delay is not characterized in de-serializer manual, wait up + * to 5 ms. + */ + for (i = 0; i < 10; i++) { + ret = max9286_read(priv, 0x49); + if (ret < 0) + return -EIO; + + if ((ret & MAX9286_VIDEO_DETECT_MASK) == priv->source_mask) + break; + + usleep_range(350, 500); + } + + if (i == 10) { + dev_err(&priv->client->dev, + "Unable to detect video links: 0x%02x\n", ret); + return -EIO; + } + + /* Make sure all enabled links are locked (4ms max). */ + for (i = 0; i < 10; i++) { + ret = max9286_read(priv, 0x27); + if (ret < 0) + return -EIO; + + if (ret & MAX9286_LOCKED) + break; + + usleep_range(350, 450); + } + + if (i == 10) { + dev_err(&priv->client->dev, "Not all enabled links locked\n"); + return -EIO; + } + + return 0; +} + +/* + * max9286_check_config_link() - Detect and wait for configuration links + * + * Determine if the configuration channel is up and settled for a link. + * + * Returns 0 for success, -EIO for errors. + */ +static int max9286_check_config_link(struct max9286_priv *priv, + unsigned int source_mask) +{ + unsigned int conflink_mask = (source_mask & 0x0f) << 4; + unsigned int i; + int ret; + + /* + * Make sure requested configuration links are detected. + * The delay is not characterized in the chip manual: wait up + * to 5 milliseconds. + */ + for (i = 0; i < 10; i++) { + ret = max9286_read(priv, 0x49) & 0xf0; + if (ret < 0) + return -EIO; + + if (ret == conflink_mask) + break; + + usleep_range(350, 500); + } + + if (ret != conflink_mask) { + dev_err(&priv->client->dev, + "Unable to detect configuration links: 0x%02x expected 0x%02x\n", + ret, conflink_mask); + return -EIO; + } + + dev_info(&priv->client->dev, + "Successfully detected configuration links after %u loops: 0x%02x\n", + i, conflink_mask); + + return 0; +} + +/* ----------------------------------------------------------------------------- + * V4L2 Subdev + */ + +static int max9286_set_pixelrate(struct max9286_priv *priv) +{ + struct max9286_source *source = NULL; + u64 pixelrate = 0; + + for_each_source(priv, source) { + struct v4l2_ctrl *ctrl; + u64 source_rate = 0; + + /* Pixel rate is mandatory to be reported by sources. */ + ctrl = v4l2_ctrl_find(source->sd->ctrl_handler, + V4L2_CID_PIXEL_RATE); + if (!ctrl) { + pixelrate = 0; + break; + } + + /* All source must report the same pixel rate. */ + source_rate = v4l2_ctrl_g_ctrl_int64(ctrl); + if (!pixelrate) { + pixelrate = source_rate; + } else if (pixelrate != source_rate) { + dev_err(&priv->client->dev, + "Unable to calculate pixel rate\n"); + return -EINVAL; + } + } + + if (!pixelrate) { + dev_err(&priv->client->dev, + "No pixel rate control available in sources\n"); + return -EINVAL; + } + + /* + * The CSI-2 transmitter pixel rate is the single source rate multiplied + * by the number of available sources. + */ + return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, + pixelrate * priv->nsources); +} + +static int max9286_notify_bound(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *subdev, + struct v4l2_async_subdev *asd) +{ + struct max9286_priv *priv = sd_to_max9286(notifier->sd); + struct max9286_source *source = asd_to_max9286_source(asd); + unsigned int index = to_index(priv, source); + unsigned int src_pad; + int ret; + + ret = media_entity_get_fwnode_pad(&subdev->entity, + source->fwnode, + MEDIA_PAD_FL_SOURCE); + if (ret < 0) { + dev_err(&priv->client->dev, + "Failed to find pad for %s\n", subdev->name); + return ret; + } + + priv->bound_sources |= BIT(index); + source->sd = subdev; + src_pad = ret; + + ret = media_create_pad_link(&source->sd->entity, src_pad, + &priv->sd.entity, index, + MEDIA_LNK_FL_ENABLED | + MEDIA_LNK_FL_IMMUTABLE); + if (ret) { + dev_err(&priv->client->dev, + "Unable to link %s:%u -> %s:%u\n", + source->sd->name, src_pad, priv->sd.name, index); + return ret; + } + + dev_dbg(&priv->client->dev, "Bound %s pad: %u on index %u\n", + subdev->name, src_pad, index); + + /* + * We can only register v4l2_async_notifiers, which do not provide a + * means to register a complete callback. bound_sources allows us to + * identify when all remote serializers have completed their probe. + */ + if (priv->bound_sources != priv->source_mask) + return 0; + + /* + * All enabled sources have probed and enabled their reverse control + * channels: + * + * - Verify all configuration links are properly detected + * - Disable auto-ack as communication on the control channel are now + * stable. + */ + max9286_check_config_link(priv, priv->source_mask); + + /* + * Re-configure I2C with local acknowledge disabled after cameras have + * probed. + */ + max9286_configure_i2c(priv, false); + + return max9286_set_pixelrate(priv); +} + +static void max9286_notify_unbind(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *subdev, + struct v4l2_async_subdev *asd) +{ + struct max9286_priv *priv = sd_to_max9286(notifier->sd); + struct max9286_source *source = asd_to_max9286_source(asd); + unsigned int index = to_index(priv, source); + + source->sd = NULL; + priv->bound_sources &= ~BIT(index); +} + +static const struct v4l2_async_notifier_operations max9286_notify_ops = { + .bound = max9286_notify_bound, + .unbind = max9286_notify_unbind, +}; + +static int max9286_v4l2_notifier_register(struct max9286_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct max9286_source *source = NULL; + int ret; + + if (!priv->nsources) + return 0; + + v4l2_async_notifier_init(&priv->notifier); + + for_each_source(priv, source) { + unsigned int i = to_index(priv, source); + + source->asd.match_type = V4L2_ASYNC_MATCH_FWNODE; + source->asd.match.fwnode = source->fwnode; + + ret = v4l2_async_notifier_add_subdev(&priv->notifier, + &source->asd); + if (ret) { + dev_err(dev, "Failed to add subdev for source %d", i); + v4l2_async_notifier_cleanup(&priv->notifier); + return ret; + } + + /* + * Balance the reference counting handled through + * v4l2_async_notifier_cleanup() + */ + fwnode_handle_get(source->fwnode); + } + + priv->notifier.ops = &max9286_notify_ops; + + ret = v4l2_async_subdev_notifier_register(&priv->sd, &priv->notifier); + if (ret) { + dev_err(dev, "Failed to register subdev_notifier"); + v4l2_async_notifier_cleanup(&priv->notifier); + return ret; + } + + return 0; +} + +static void max9286_v4l2_notifier_unregister(struct max9286_priv *priv) +{ + if (!priv->nsources) + return; + + v4l2_async_notifier_unregister(&priv->notifier); + v4l2_async_notifier_cleanup(&priv->notifier); +} + +static int max9286_s_stream(struct v4l2_subdev *sd, int enable) +{ + struct max9286_priv *priv = sd_to_max9286(sd); + struct max9286_source *source; + unsigned int i; + bool sync = false; + int ret; + + if (enable) { + /* + * The frame sync between cameras is transmitted across the + * reverse channel as GPIO. We must open all channels while + * streaming to allow this synchronisation signal to be shared. + */ + max9286_i2c_mux_open(priv); + + /* Start all cameras. */ + for_each_source(priv, source) { + ret = v4l2_subdev_call(source->sd, video, s_stream, 1); + if (ret) + return ret; + } + + ret = max9286_check_video_links(priv); + if (ret) + return ret; + + /* + * Wait until frame synchronization is locked. + * + * Manual says frame sync locking should take ~6 VTS. + * From practical experience at least 8 are required. Give + * 12 complete frames time (~400ms at 30 fps) to achieve frame + * locking before returning error. + */ + for (i = 0; i < 40; i++) { + if (max9286_read(priv, 0x31) & MAX9286_FSYNC_LOCKED) { + sync = true; + break; + } + usleep_range(9000, 11000); + } + + if (!sync) { + dev_err(&priv->client->dev, + "Failed to get frame synchronization\n"); + return -EXDEV; /* Invalid cross-device link */ + } + + /* + * Enable CSI output, VC set according to link number. + * Bit 7 must be set (chip manual says it's 0 and reserved). + */ + max9286_write(priv, 0x15, 0x80 | MAX9286_VCTYPE | + MAX9286_CSIOUTEN | MAX9286_0X15_RESV); + } else { + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); + + /* Stop all cameras. */ + for_each_source(priv, source) + v4l2_subdev_call(source->sd, video, s_stream, 0); + + max9286_i2c_mux_close(priv); + } + + return 0; +} + +static int max9286_enum_mbus_code(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_mbus_code_enum *code) +{ + if (code->pad || code->index > 0) + return -EINVAL; + + code->code = MEDIA_BUS_FMT_UYVY8_2X8; + + return 0; +} + +static struct v4l2_mbus_framefmt * +max9286_get_pad_format(struct max9286_priv *priv, + struct v4l2_subdev_pad_config *cfg, + unsigned int pad, u32 which) +{ + switch (which) { + case V4L2_SUBDEV_FORMAT_TRY: + return v4l2_subdev_get_try_format(&priv->sd, cfg, pad); + case V4L2_SUBDEV_FORMAT_ACTIVE: + return &priv->fmt[pad]; + default: + return NULL; + } +} + +static int max9286_set_fmt(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_format *format) +{ + struct max9286_priv *priv = sd_to_max9286(sd); + struct v4l2_mbus_framefmt *cfg_fmt; + + if (format->pad >= MAX9286_SRC_PAD) + return -EINVAL; + + /* Refuse non YUV422 formats as we hardcode DT to 8 bit YUV422 */ + switch (format->format.code) { + case MEDIA_BUS_FMT_UYVY8_2X8: + case MEDIA_BUS_FMT_VYUY8_2X8: + case MEDIA_BUS_FMT_YUYV8_2X8: + case MEDIA_BUS_FMT_YVYU8_2X8: + break; + default: + format->format.code = MEDIA_BUS_FMT_YUYV8_2X8; + break; + } + + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); + if (!cfg_fmt) + return -EINVAL; + + mutex_lock(&priv->mutex); + *cfg_fmt = format->format; + mutex_unlock(&priv->mutex); + + return 0; +} + +static int max9286_get_fmt(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_format *format) +{ + struct max9286_priv *priv = sd_to_max9286(sd); + struct v4l2_mbus_framefmt *cfg_fmt; + + if (format->pad >= MAX9286_SRC_PAD) + return -EINVAL; + + cfg_fmt = max9286_get_pad_format(priv, cfg, format->pad, format->which); + if (!cfg_fmt) + return -EINVAL; + + mutex_lock(&priv->mutex); + format->format = *cfg_fmt; + mutex_unlock(&priv->mutex); + + return 0; +} + +static const struct v4l2_subdev_video_ops max9286_video_ops = { + .s_stream = max9286_s_stream, +}; + +static const struct v4l2_subdev_pad_ops max9286_pad_ops = { + .enum_mbus_code = max9286_enum_mbus_code, + .get_fmt = max9286_get_fmt, + .set_fmt = max9286_set_fmt, +}; + +static const struct v4l2_subdev_ops max9286_subdev_ops = { + .video = &max9286_video_ops, + .pad = &max9286_pad_ops, +}; + +static void max9286_init_format(struct v4l2_mbus_framefmt *fmt) +{ + fmt->width = 1280; + fmt->height = 800; + fmt->code = MEDIA_BUS_FMT_UYVY8_2X8; + fmt->colorspace = V4L2_COLORSPACE_SRGB; + fmt->field = V4L2_FIELD_NONE; + fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; + fmt->quantization = V4L2_QUANTIZATION_DEFAULT; + fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT; +} + +static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh) +{ + struct v4l2_mbus_framefmt *format; + unsigned int i; + + for (i = 0; i < MAX9286_N_SINKS; i++) { + format = v4l2_subdev_get_try_format(subdev, fh->pad, i); + max9286_init_format(format); + } + + return 0; +} + +static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = { + .open = max9286_open, +}; + +static int max9286_s_ctrl(struct v4l2_ctrl *ctrl) +{ + switch (ctrl->id) { + case V4L2_CID_PIXEL_RATE: + return 0; + default: + return -EINVAL; + } +} + +static const struct v4l2_ctrl_ops max9286_ctrl_ops = { + .s_ctrl = max9286_s_ctrl, +}; + +static int max9286_v4l2_register(struct max9286_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct fwnode_handle *ep; + int ret; + int i; + + /* Register v4l2 async notifiers for connected Camera subdevices */ + ret = max9286_v4l2_notifier_register(priv); + if (ret) { + dev_err(dev, "Unable to register V4L2 async notifiers\n"); + return ret; + } + + /* Configure V4L2 for the MAX9286 itself */ + + for (i = 0; i < MAX9286_N_SINKS; i++) + max9286_init_format(&priv->fmt[i]); + + v4l2_i2c_subdev_init(&priv->sd, priv->client, &max9286_subdev_ops); + priv->sd.internal_ops = &max9286_subdev_internal_ops; + priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + + v4l2_ctrl_handler_init(&priv->ctrls, 1); + priv->pixelrate = v4l2_ctrl_new_std(&priv->ctrls, + &max9286_ctrl_ops, + V4L2_CID_PIXEL_RATE, + 1, INT_MAX, 1, 50000000); + + priv->sd.ctrl_handler = &priv->ctrls; + ret = priv->ctrls.error; + if (ret) + goto err_async; + + priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; + + priv->pads[MAX9286_SRC_PAD].flags = MEDIA_PAD_FL_SOURCE; + for (i = 0; i < MAX9286_SRC_PAD; i++) + priv->pads[i].flags = MEDIA_PAD_FL_SINK; + ret = media_entity_pads_init(&priv->sd.entity, MAX9286_N_PADS, + priv->pads); + if (ret) + goto err_async; + + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), MAX9286_SRC_PAD, + 0, 0); + if (!ep) { + dev_err(dev, "Unable to retrieve endpoint on \"port@4\"\n"); + ret = -ENOENT; + goto err_async; + } + priv->sd.fwnode = ep; + + ret = v4l2_async_register_subdev(&priv->sd); + if (ret < 0) { + dev_err(dev, "Unable to register subdevice\n"); + goto err_put_node; + } + + return 0; + +err_put_node: + fwnode_handle_put(ep); +err_async: + max9286_v4l2_notifier_unregister(priv); + + return ret; +} + +static void max9286_v4l2_unregister(struct max9286_priv *priv) +{ + fwnode_handle_put(priv->sd.fwnode); + v4l2_async_unregister_subdev(&priv->sd); + max9286_v4l2_notifier_unregister(priv); +} + +/* ----------------------------------------------------------------------------- + * Probe/Remove + */ + +static int max9286_setup(struct max9286_priv *priv) +{ + /* + * Link ordering values for all enabled links combinations. Orders must + * be assigned sequentially from 0 to the number of enabled links + * without leaving any hole for disabled links. We thus assign orders to + * enabled links first, and use the remaining order values for disabled + * links are all links must have a different order value; + */ + static const u8 link_order[] = { + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxxx */ + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xxx0 */ + (3 << 6) | (2 << 4) | (0 << 2) | (1 << 0), /* xx0x */ + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* xx10 */ + (3 << 6) | (0 << 4) | (2 << 2) | (1 << 0), /* x0xx */ + (3 << 6) | (1 << 4) | (2 << 2) | (0 << 0), /* x1x0 */ + (3 << 6) | (1 << 4) | (0 << 2) | (2 << 0), /* x10x */ + (3 << 6) | (1 << 4) | (1 << 2) | (0 << 0), /* x210 */ + (0 << 6) | (3 << 4) | (2 << 2) | (1 << 0), /* 0xxx */ + (1 << 6) | (3 << 4) | (2 << 2) | (0 << 0), /* 1xx0 */ + (1 << 6) | (3 << 4) | (0 << 2) | (2 << 0), /* 1x0x */ + (2 << 6) | (3 << 4) | (1 << 2) | (0 << 0), /* 2x10 */ + (1 << 6) | (0 << 4) | (3 << 2) | (2 << 0), /* 10xx */ + (2 << 6) | (1 << 4) | (3 << 2) | (0 << 0), /* 21x0 */ + (2 << 6) | (1 << 4) | (0 << 2) | (3 << 0), /* 210x */ + (3 << 6) | (2 << 4) | (1 << 2) | (0 << 0), /* 3210 */ + }; + + /* + * Set the I2C bus speed. + * + * Enable I2C Local Acknowledge during the probe sequences of the camera + * only. This should be disabled after the mux is initialised. + */ + max9286_configure_i2c(priv, true); + + /* + * Reverse channel setup. + * + * - Enable custom reverse channel configuration (through register 0x3f) + * and set the first pulse length to 35 clock cycles. + * - Increase the reverse channel amplitude to 170mV to accommodate the + * high threshold enabled by the serializer driver. + */ + max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35)); + max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) | + MAX9286_REV_AMP_X); + usleep_range(2000, 2500); + + /* + * Enable GMSL links, mask unused ones and autodetect link + * used as CSI clock source. + */ + max9286_write(priv, 0x00, MAX9286_MSTLINKSEL_AUTO | priv->route_mask); + max9286_write(priv, 0x0b, link_order[priv->route_mask]); + max9286_write(priv, 0x69, (0xf & ~priv->route_mask)); + + /* + * Video format setup: + * Disable CSI output, VC is set according to Link number. + */ + max9286_write(priv, 0x15, MAX9286_VCTYPE | MAX9286_0X15_RESV); + + /* Enable CSI-2 Lane D0-D3 only, DBL mode, YUV422 8-bit. */ + max9286_write(priv, 0x12, MAX9286_CSIDBL | MAX9286_DBL | + MAX9286_CSILANECNT(priv->csi2_data_lanes) | + MAX9286_DATATYPE_YUV422_8BIT); + + /* Automatic: FRAMESYNC taken from the slowest Link. */ + max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ | + MAX9286_FSYNCMETH_AUTO); + + /* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */ + max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS | + MAX9286_HVSRC_D14); + + /* + * The overlap window seems to provide additional validation by tracking + * the delay between vsync and frame sync, generating an error if the + * delay is bigger than the programmed window, though it's not yet clear + * what value should be set. + * + * As it's an optional value and can be disabled, we do so by setting + * a 0 overlap value. + */ + max9286_write(priv, 0x63, 0); + max9286_write(priv, 0x64, 0); + + /* + * Wait for 2ms to allow the link to resynchronize after the + * configuration change. + */ + usleep_range(2000, 5000); + + return 0; +} + +static void max9286_gpio_set(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct max9286_priv *priv = gpiochip_get_data(chip); + + if (value) + priv->gpio_state |= BIT(offset); + else + priv->gpio_state &= ~BIT(offset); + + max9286_write(priv, 0x0f, MAX9286_0X0F_RESERVED | priv->gpio_state); +} + +static int max9286_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct max9286_priv *priv = gpiochip_get_data(chip); + + return priv->gpio_state & BIT(offset); +} + +static int max9286_register_gpio(struct max9286_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct gpio_chip *gpio = &priv->gpio; + int ret; + + static const char * const names[] = { + "GPIO0OUT", + "GPIO1OUT", + }; + + /* Configure the GPIO */ + gpio->label = dev_name(dev); + gpio->parent = dev; + gpio->owner = THIS_MODULE; + gpio->of_node = dev->of_node; + gpio->ngpio = 2; + gpio->base = -1; + gpio->set = max9286_gpio_set; + gpio->get = max9286_gpio_get; + gpio->can_sleep = true; + gpio->names = names; + + /* GPIO values default to high */ + priv->gpio_state = BIT(0) | BIT(1); + + ret = devm_gpiochip_add_data(dev, gpio, priv); + if (ret) + dev_err(dev, "Unable to create gpio_chip\n"); + + return ret; +} + +static int max9286_init(struct device *dev) +{ + struct max9286_priv *priv; + struct i2c_client *client; + int ret; + + client = to_i2c_client(dev); + priv = i2c_get_clientdata(client); + + /* Enable the bus power. */ + ret = regulator_enable(priv->regulator); + if (ret < 0) { + dev_err(&client->dev, "Unable to turn PoC on\n"); + return ret; + } + + ret = max9286_setup(priv); + if (ret) { + dev_err(dev, "Unable to setup max9286\n"); + goto err_regulator; + } + + /* + * Register all V4L2 interactions for the MAX9286 and notifiers for + * any subdevices connected. + */ + ret = max9286_v4l2_register(priv); + if (ret) { + dev_err(dev, "Failed to register with V4L2\n"); + goto err_regulator; + } + + ret = max9286_i2c_mux_init(priv); + if (ret) { + dev_err(dev, "Unable to initialize I2C multiplexer\n"); + goto err_v4l2_register; + } + + /* Leave the mux channels disabled until they are selected. */ + max9286_i2c_mux_close(priv); + + return 0; + +err_v4l2_register: + max9286_v4l2_unregister(priv); +err_regulator: + regulator_disable(priv->regulator); + + return ret; +} + +static void max9286_cleanup_dt(struct max9286_priv *priv) +{ + struct max9286_source *source; + + for_each_source(priv, source) { + fwnode_handle_put(source->fwnode); + source->fwnode = NULL; + } +} + +static int max9286_parse_dt(struct max9286_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct device_node *i2c_mux; + struct device_node *node = NULL; + unsigned int i2c_mux_mask = 0; + + of_node_get(dev->of_node); + i2c_mux = of_find_node_by_name(dev->of_node, "i2c-mux"); + if (!i2c_mux) { + dev_err(dev, "Failed to find i2c-mux node\n"); + of_node_put(dev->of_node); + return -EINVAL; + } + + /* Identify which i2c-mux channels are enabled */ + for_each_child_of_node(i2c_mux, node) { + u32 id = 0; + + of_property_read_u32(node, "reg", &id); + if (id >= MAX9286_NUM_GMSL) + continue; + + if (!of_device_is_available(node)) { + dev_dbg(dev, "Skipping disabled I2C bus port %u\n", id); + continue; + } + + i2c_mux_mask |= BIT(id); + } + of_node_put(node); + of_node_put(i2c_mux); + + /* Parse the endpoints */ + for_each_endpoint_of_node(dev->of_node, node) { + struct max9286_source *source; + struct of_endpoint ep; + + of_graph_parse_endpoint(node, &ep); + dev_dbg(dev, "Endpoint %pOF on port %d", + ep.local_node, ep.port); + + if (ep.port > MAX9286_NUM_GMSL) { + dev_err(dev, "Invalid endpoint %s on port %d", + of_node_full_name(ep.local_node), ep.port); + continue; + } + + /* For the source endpoint just parse the bus configuration. */ + if (ep.port == MAX9286_SRC_PAD) { + struct v4l2_fwnode_endpoint vep = { + .bus_type = V4L2_MBUS_CSI2_DPHY + }; + int ret; + + ret = v4l2_fwnode_endpoint_parse( + of_fwnode_handle(node), &vep); + if (ret) { + of_node_put(node); + of_node_put(dev->of_node); + return ret; + } + + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) { + dev_err(dev, + "Media bus %u type not supported\n", + vep.bus_type); + v4l2_fwnode_endpoint_free(&vep); + of_node_put(node); + of_node_put(dev->of_node); + return -EINVAL; + } + + priv->csi2_data_lanes = + vep.bus.mipi_csi2.num_data_lanes; + v4l2_fwnode_endpoint_free(&vep); + + continue; + } + + /* Skip if the corresponding GMSL link is unavailable. */ + if (!(i2c_mux_mask & BIT(ep.port))) + continue; + + if (priv->sources[ep.port].fwnode) { + dev_err(dev, + "Multiple port endpoints are not supported: %d", + ep.port); + + continue; + } + + source = &priv->sources[ep.port]; + source->fwnode = fwnode_graph_get_remote_endpoint( + of_fwnode_handle(node)); + if (!source->fwnode) { + dev_err(dev, + "Endpoint %pOF has no remote endpoint connection\n", + ep.local_node); + + continue; + } + + priv->source_mask |= BIT(ep.port); + priv->nsources++; + } + of_node_put(node); + of_node_put(dev->of_node); + + priv->route_mask = priv->source_mask; + + return 0; +} + +static int max9286_probe(struct i2c_client *client) +{ + struct max9286_priv *priv; + int ret; + + priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + mutex_init(&priv->mutex); + + priv->client = client; + i2c_set_clientdata(client, priv); + + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", + GPIOD_OUT_HIGH); + if (IS_ERR(priv->gpiod_pwdn)) + return PTR_ERR(priv->gpiod_pwdn); + + gpiod_set_consumer_name(priv->gpiod_pwdn, "max9286-pwdn"); + gpiod_set_value_cansleep(priv->gpiod_pwdn, 1); + + /* Wait at least 4ms before the I2C lines latch to the address */ + if (priv->gpiod_pwdn) + usleep_range(4000, 5000); + + /* + * The MAX9286 starts by default with all ports enabled, we disable all + * ports early to ensure that all channels are disabled if we error out + * and keep the bus consistent. + */ + max9286_i2c_mux_close(priv); + + /* + * The MAX9286 initialises with auto-acknowledge enabled by default. + * This can be invasive to other transactions on the same bus, so + * disable it early. It will be enabled only as and when needed. + */ + max9286_configure_i2c(priv, false); + + ret = max9286_register_gpio(priv); + if (ret) + goto err_powerdown; + + priv->regulator = devm_regulator_get(&client->dev, "poc"); + if (IS_ERR(priv->regulator)) { + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) + dev_err(&client->dev, + "Unable to get PoC regulator (%ld)\n", + PTR_ERR(priv->regulator)); + ret = PTR_ERR(priv->regulator); + goto err_powerdown; + } + + ret = max9286_parse_dt(priv); + if (ret) + goto err_powerdown; + + ret = max9286_init(&client->dev); + if (ret < 0) + goto err_cleanup_dt; + + return 0; + +err_cleanup_dt: + max9286_cleanup_dt(priv); +err_powerdown: + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); + + return ret; +} + +static int max9286_remove(struct i2c_client *client) +{ + struct max9286_priv *priv = i2c_get_clientdata(client); + + i2c_mux_del_adapters(priv->mux); + + max9286_v4l2_unregister(priv); + + regulator_disable(priv->regulator); + + gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); + + max9286_cleanup_dt(priv); + + return 0; +} + +static const struct of_device_id max9286_dt_ids[] = { + { .compatible = "maxim,max9286" }, + {}, +}; +MODULE_DEVICE_TABLE(of, max9286_dt_ids); + +static struct i2c_driver max9286_i2c_driver = { + .driver = { + .name = "max9286", + .of_match_table = of_match_ptr(max9286_dt_ids), + }, + .probe_new = max9286_probe, + .remove = max9286_remove, +}; + +module_i2c_driver(max9286_i2c_driver); + +MODULE_DESCRIPTION("Maxim MAX9286 GMSL Deserializer Driver"); +MODULE_AUTHOR("Jacopo Mondi, Kieran Bingham, Laurent Pinchart, Niklas Söderlund, Vladimir Barinov"); +MODULE_LICENSE("GPL");