| Message ID | 20170115170535.24463-1-marek.vasut@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
On 15/01/17 17:05, Marek Vasut wrote: > Add IIO driver for the Renesas RCar GyroADC block. This block is a > simple 4/8-channel ADC which samples 12/15/24 bits of data every > cycle from all channels. > > Signed-off-by: Marek Vasut <marek.vasut@gmail.com> > Cc: Geert Uytterhoeven <geert+renesas@glider.be> > Cc: Simon Horman <horms+renesas@verge.net.au> > Cc: Jonathan Cameron <jic23@kernel.org> > Cc: linux-renesas-soc@vger.kernel.org Hi Marek, One thing I hadn't picked up on earlier. This hasn't been going to the devicetree list or maintainers. I'd like an ack from them on the bindings as they are a little 'unusual' given the odd nature of the part. Cc'd Rob, Mark and the list. Jonathan > --- > V2: - Spelling fixes > - Rename the driver source file to rcar-gyroadc > - Rework the channel sample width handling > - Use iio_device_claim_mode_direct() > - Rename "renesas,rcar-gyroadc" to "renesas,r8a7791-gyroadc" and > rename "renesas,rcar-gyroadc-r8a7792" to "renesas,r8a7792-gyroadc" > to match the new naming scheme (WARNING: scif uses the old one!) > - Switch to using regulators for channel voltage reference, add new > properties renesas,gyroadc-vref-chN-supply for N in 0..7 > - Handle vref regulators as optional to, make channels without > vref regulator return EINVAL on read. > - Fix module license to GPL > - Drop interrupt.h include > - Rename clk to iclk > - Rename RCar to R-Car > - Rework the invalid mode handling > - Don't print error message on EPROBE_DEFER > - Drop fclk handling, use runtime PM for that instead > V3: - More R-Car spelling fixes > - Flip checks for V2H, since that's the only one that has > interrupt registers > - Replace if-else statement with switch statement in init_mode > - Use unsigned types where applicable > - Rework timing calculation slightly to drop if-else block > - Use DIV_ROUND_CLOSEST > V4: - Add renesas,rcar-gyroadc fallback compatible string into the bindings > - Rework the ADC bindings to use per-channel subdevs > - Support more compatible ADC chips > V5: - Reword the DT bindings, improve the description of the modes > - Improve the description in Kconfig > - Implement special DT bindings for the MB88101A 4-channel ADC and > add special handling for this chip into the driver. > - Add missing ADC stop on failure, wrap it into a function > - Fail hard in case the DT properties are incorrect or missing > - Fix reporting of scale, so that channel * scale value is in mV > - Use fractional scale instead of int plus nano > - Use pm_runtime to disable the sampling 2 seconds after last used > V6: - Replace the indio_dev->name with "rcar-gyroadc" instead of OF node name > --- > .../bindings/iio/adc/renesas,gyroadc.txt | 93 +++ > MAINTAINERS | 6 + > drivers/iio/adc/Kconfig | 13 + > drivers/iio/adc/Makefile | 1 + > drivers/iio/adc/rcar-gyroadc.c | 631 +++++++++++++++++++++ > 5 files changed, 744 insertions(+) > create mode 100644 Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt > create mode 100644 drivers/iio/adc/rcar-gyroadc.c > > diff --git a/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt b/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt > new file mode 100644 > index 000000000000..081947367135 > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt > @@ -0,0 +1,93 @@ > +* Renesas RCar GyroADC device driver > + > +Required properties: > +- compatible: Should be "renesas,<chip>-gyroadc", "renesas,rcar-gyroadc". > + Use "renesas,r8a7792-gyroadc" for a GyroADC with interrupt > + block found in R8A7792. > +- reg: Address and length of the register set for the device > +- clocks: References to all the clocks specified in the clock-names > + property as specified in > + Documentation/devicetree/bindings/clock/clock-bindings.txt. > +- clock-names: Shall contain "fck" and "if". The "fck" is the GyroADC block > + clock, the "if" is the interface clock. > +- power-domains: Must contain a reference to the PM domain, if available. > +- #address-cells: Should be <1> (setting for the subnodes) for all ADCs > + except for "fujitsu,mb88101a". Should be <0> (setting for > + only subnode) for "fujitsu,mb88101a". > +- #size-cells: Should be <0> (setting for the subnodes) > + > +Sub-nodes: > +Optionally you can define subnodes which select the connected ADC type and > +reference voltage for the GyroADC channels. > + > +Required properties for subnodes: > +- compatible: Should be either of: > + "fujitsu,mb88101a" > + - Fujitsu MB88101A compatible mode, > + 12bit sampling, up to 4 channels can be sampled in > + round-robin fashion. One Fujitsu chip supplies four > + GyroADC channels with data as it contains four ADCs > + on the chip and thus for 4-channel operation, single > + MB88101A is required. The Cx chipselect lines of the > + MB88101A connect directly to two CHS lines of the > + GyroADC, no demuxer is required. The data out line > + of each MB88101A connects to a shared input pin of > + the GyroADC. > + "ti,adcs7476" or "ti,adc121" or "adi,ad7476" > + - TI ADCS7476 / TI ADC121 / ADI AD7476 compatible mode, > + 15bit sampling, up to 8 channels can be sampled in > + round-robin fashion. One TI/ADI chip supplies single > + ADC channel with data, thus for 8-channel operation, > + 8 chips are required. A 3:8 chipselect demuxer is > + required to connect the nCS line of the TI/ADI chips > + to the GyroADC, while MISO line of each TI/ADI ADC > + connects to a shared input pin of the GyroADC. > + "maxim,max1162" or "maxim,max11100" > + - Maxim MAX1162 / Maxim MAX11100 compatible mode, > + 16bit sampling, up to 8 channels can be sampled in > + round-robin fashion. One Maxim chip supplies single > + ADC channel with data, thus for 8-channel operation, > + 8 chips are required. A 3:8 chipselect demuxer is > + required to connect the nCS line of the MAX chips > + to the GyroADC, while MISO line of each Maxim ADC > + connects to a shared input pin of the GyroADC. > +- reg: Should be the number of the analog input. Should be present > + for all ADCs except "fujitsu,mb88101a". > +- vref-supply: Reference to the channel reference voltage regulator. > + > +Example: > + vref_max1162: regulator-vref-max1162 { > + compatible = "regulator-fixed"; > + > + regulator-name = "MAX1162 Vref"; > + regulator-min-microvolt = <4096000>; > + regulator-max-microvolt = <4096000>; > + }; > + > + &adc { > + compatible = "renesas,r8a7791-gyroadc", "renesas,rcar-gyroadc"; > + reg = <0 0xe6e54000 0 64>; > + clocks = <&mstp9_clks R8A7791_CLK_GYROADC>, <&clk_65m>; > + clock-names = "fck", "if"; > + power-domains = <&sysc R8A7791_PD_ALWAYS_ON>; > + > + pinctrl-0 = <&adc_pins>; > + pinctrl-names = "default"; > + > + status = "okay"; > + > + #address-cells = <1>; > + #size-cells = <0>; > + > + adc@0 { > + reg = <0>; > + compatible = "maxim,max1162"; > + vref-supply = <&vref_max1162>; > + }; > + > + adc@1 { > + reg = <1>; > + compatible = "maxim,max1162"; > + vref-supply = <&vref_max1162>; > + }; > + }; > diff --git a/MAINTAINERS b/MAINTAINERS > index 890fc9e3c191..498e8a755eb6 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -10276,6 +10276,12 @@ L: linux-renesas-soc@vger.kernel.org > F: drivers/net/ethernet/renesas/ > F: include/linux/sh_eth.h > > +RENESAS R-CAR GYROADC DRIVER > +M: Marek Vasut <marek.vasut@gmail.com> > +L: linux-iio@vger.kernel.org > +S: Supported > +F: drivers/iio/adc/rcar_gyro_adc.c > + > RENESAS USB2 PHY DRIVER > M: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> > L: linux-renesas-soc@vger.kernel.org > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > index 99c051490eff..2fbc11f42740 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -408,6 +408,19 @@ config QCOM_SPMI_VADC > To compile this driver as a module, choose M here: the module will > be called qcom-spmi-vadc. > > +config RCAR_GYRO_ADC > + tristate "Renesas R-Car GyroADC driver" > + depends on ARCH_RCAR_GEN2 || (ARM && COMPILE_TEST) > + help > + Say yes here to build support for the GyroADC found in Renesas > + R-Car Gen2 SoCs. This block is a simple SPI offload engine for > + reading data out of attached compatible ADCs in a round-robin > + fashion. Up to 4 or 8 ADC channels are supported by this block, > + depending on which ADCs are attached. > + > + To compile this driver as a module, choose M here: the > + module will be called rcar-gyroadc. > + > config ROCKCHIP_SARADC > tristate "Rockchip SARADC driver" > depends on ARCH_ROCKCHIP || (ARM && COMPILE_TEST) > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > index 7a40c04c311f..13db7c2bffc8 100644 > --- a/drivers/iio/adc/Makefile > +++ b/drivers/iio/adc/Makefile > @@ -39,6 +39,7 @@ obj-$(CONFIG_NAU7802) += nau7802.o > obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o > obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o > obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o > +obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o > obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o > obj-$(CONFIG_STX104) += stx104.o > obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o > diff --git a/drivers/iio/adc/rcar-gyroadc.c b/drivers/iio/adc/rcar-gyroadc.c > new file mode 100644 > index 000000000000..0c44f72c32a8 > --- /dev/null > +++ b/drivers/iio/adc/rcar-gyroadc.c > @@ -0,0 +1,631 @@ > +/* > + * Renesas R-Car GyroADC driver > + * > + * Copyright 2016 Marek Vasut <marek.vasut@gmail.com> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/delay.h> > +#include <linux/kernel.h> > +#include <linux/slab.h> > +#include <linux/io.h> > +#include <linux/clk.h> > +#include <linux/of.h> > +#include <linux/of_irq.h> > +#include <linux/regulator/consumer.h> > +#include <linux/of_platform.h> > +#include <linux/err.h> > +#include <linux/pm_runtime.h> > + > +#include <linux/iio/iio.h> > +#include <linux/iio/sysfs.h> > +#include <linux/iio/trigger.h> > + > +#define DRIVER_NAME "rcar-gyroadc" > + > +/* GyroADC registers. */ > +#define RCAR_GYROADC_MODE_SELECT 0x00 > +#define RCAR_GYROADC_MODE_SELECT_1_MB88101A 0x0 > +#define RCAR_GYROADC_MODE_SELECT_2_ADCS7476 0x1 > +#define RCAR_GYROADC_MODE_SELECT_3_MAX1162 0x3 > + > +#define RCAR_GYROADC_START_STOP 0x04 > +#define RCAR_GYROADC_START_STOP_START BIT(0) > + > +#define RCAR_GYROADC_CLOCK_LENGTH 0x08 > +#define RCAR_GYROADC_1_25MS_LENGTH 0x0c > + > +#define RCAR_GYROADC_REALTIME_DATA(ch) (0x10 + ((ch) * 4)) > +#define RCAR_GYROADC_100MS_ADDED_DATA(ch) (0x30 + ((ch) * 4)) > +#define RCAR_GYROADC_10MS_AVG_DATA(ch) (0x50 + ((ch) * 4)) > + > +#define RCAR_GYROADC_FIFO_STATUS 0x70 > +#define RCAR_GYROADC_FIFO_STATUS_EMPTY(ch) BIT(0 + (4 * (ch))) > +#define RCAR_GYROADC_FIFO_STATUS_FULL(ch) BIT(1 + (4 * (ch))) > +#define RCAR_GYROADC_FIFO_STATUS_ERROR(ch) BIT(2 + (4 * (ch))) > + > +#define RCAR_GYROADC_INTR 0x74 > +#define RCAR_GYROADC_INTR_INT BIT(0) > + > +#define RCAR_GYROADC_INTENR 0x78 > +#define RCAR_GYROADC_INTENR_INTEN BIT(0) > + > +#define RCAR_GYROADC_SAMPLE_RATE 800 /* Hz */ > + > +#define RCAR_GYROADC_RUNTIME_PM_DELAY_MS 2000 > + > +enum rcar_gyroadc_model { > + RCAR_GYROADC_MODEL_DEFAULT, > + RCAR_GYROADC_MODEL_R8A7792, > +}; > + > +struct rcar_gyroadc { > + struct device *dev; > + void __iomem *regs; > + struct clk *iclk; > + struct regulator *vref[8]; > + unsigned int num_channels; > + enum rcar_gyroadc_model model; > + unsigned int mode; > + unsigned int sample_width; > +}; > + > +static void rcar_gyroadc_hw_init(struct rcar_gyroadc *priv) > +{ > + const unsigned long clk_mhz = clk_get_rate(priv->iclk) / 1000000; > + const unsigned long clk_mul = > + (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) ? 10 : 5; > + unsigned long clk_len = clk_mhz * clk_mul; > + > + /* > + * According to the R-Car Gen2 datasheet Rev. 1.01, Sept 08 2014, > + * page 77-7, clock length must be even number. If it's odd number, > + * add one. > + */ > + if (clk_len & 1) > + clk_len++; > + > + /* Stop the GyroADC. */ > + writel(0, priv->regs + RCAR_GYROADC_START_STOP); > + > + /* Disable IRQ on V2H. */ > + if (priv->model == RCAR_GYROADC_MODEL_R8A7792) > + writel(0, priv->regs + RCAR_GYROADC_INTENR); > + > + /* Set mode and timing. */ > + writel(priv->mode, priv->regs + RCAR_GYROADC_MODE_SELECT); > + writel(clk_len, priv->regs + RCAR_GYROADC_CLOCK_LENGTH); > + writel(clk_mhz * 1250, priv->regs + RCAR_GYROADC_1_25MS_LENGTH); > +} > + > +static void rcar_gyroadc_hw_start(struct rcar_gyroadc *priv) > +{ > + /* Start sampling. */ > + writel(RCAR_GYROADC_START_STOP_START, > + priv->regs + RCAR_GYROADC_START_STOP); > + > + /* > + * Wait for the first conversion to complete. This is longer than > + * the 1.25 mS in the datasheet because 1.25 mS is not enough for > + * the hardware to deliver the first sample and the hardware does > + * then return zeroes instead of valid data. > + */ > + mdelay(3); > +} > + > +static void rcar_gyroadc_hw_stop(struct rcar_gyroadc *priv) > +{ > + /* Stop the GyroADC. */ > + writel(0, priv->regs + RCAR_GYROADC_START_STOP); > +} > + > +#define RCAR_GYROADC_CHAN(_idx) { \ > + .type = IIO_VOLTAGE, \ > + .indexed = 1, \ > + .channel = (_idx), \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > + BIT(IIO_CHAN_INFO_SCALE), \ > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ > +} > + > +static const struct iio_chan_spec rcar_gyroadc_iio_channels_1[] = { > + RCAR_GYROADC_CHAN(0), > + RCAR_GYROADC_CHAN(1), > + RCAR_GYROADC_CHAN(2), > + RCAR_GYROADC_CHAN(3), > +}; > + > +static const struct iio_chan_spec rcar_gyroadc_iio_channels_2[] = { > + RCAR_GYROADC_CHAN(0), > + RCAR_GYROADC_CHAN(1), > + RCAR_GYROADC_CHAN(2), > + RCAR_GYROADC_CHAN(3), > + RCAR_GYROADC_CHAN(4), > + RCAR_GYROADC_CHAN(5), > + RCAR_GYROADC_CHAN(6), > + RCAR_GYROADC_CHAN(7), > +}; > + > +static const struct iio_chan_spec rcar_gyroadc_iio_channels_3[] = { > + RCAR_GYROADC_CHAN(0), > + RCAR_GYROADC_CHAN(1), > + RCAR_GYROADC_CHAN(2), > + RCAR_GYROADC_CHAN(3), > + RCAR_GYROADC_CHAN(4), > + RCAR_GYROADC_CHAN(5), > + RCAR_GYROADC_CHAN(6), > + RCAR_GYROADC_CHAN(7), > +}; > + > +static int rcar_gyroadc_set_power(struct rcar_gyroadc *priv, bool on) > +{ > + struct device *dev = priv->dev; > + int ret; > + > + if (on) { > + ret = pm_runtime_get_sync(dev); > + if (ret < 0) > + pm_runtime_put_noidle(dev); > + } else { > + pm_runtime_mark_last_busy(dev); > + ret = pm_runtime_put_autosuspend(dev); > + } > + > + return ret; > +} > + > +static int rcar_gyroadc_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct rcar_gyroadc *priv = iio_priv(indio_dev); > + struct regulator *consumer; > + unsigned int datareg = RCAR_GYROADC_REALTIME_DATA(chan->channel); > + unsigned int vref; > + int ret; > + > + /* > + * MB88101 is special in that it has only single regulator for > + * all four channels. > + */ > + if (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) > + consumer = priv->vref[0]; > + else > + consumer = priv->vref[chan->channel]; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + if (chan->type != IIO_VOLTAGE) > + return -EINVAL; > + > + /* Channel not connected. */ > + if (!consumer) > + return -EINVAL; > + > + ret = iio_device_claim_direct_mode(indio_dev); > + if (ret) > + return ret; > + > + ret = rcar_gyroadc_set_power(priv, true); > + if (ret < 0) { > + iio_device_release_direct_mode(indio_dev); > + return ret; > + } > + > + *val = readl(priv->regs + datareg); > + *val &= BIT(priv->sample_width) - 1; > + > + ret = rcar_gyroadc_set_power(priv, false); > + iio_device_release_direct_mode(indio_dev); > + if (ret < 0) > + return ret; > + > + return IIO_VAL_INT; > + case IIO_CHAN_INFO_SCALE: > + /* Channel not connected. */ > + if (!consumer) > + return -EINVAL; > + > + vref = regulator_get_voltage(consumer); > + *val = vref / 1000; > + *val2 = 1 << priv->sample_width; > + > + return IIO_VAL_FRACTIONAL; > + case IIO_CHAN_INFO_SAMP_FREQ: > + *val = RCAR_GYROADC_SAMPLE_RATE; > + > + return IIO_VAL_INT; > + default: > + return -EINVAL; > + } > +} > + > +static int rcar_gyroadc_reg_access(struct iio_dev *indio_dev, > + unsigned int reg, unsigned int writeval, > + unsigned int *readval) > +{ > + struct rcar_gyroadc *priv = iio_priv(indio_dev); > + unsigned int maxreg = RCAR_GYROADC_FIFO_STATUS; > + > + if (readval == NULL) > + return -EINVAL; > + > + if (reg % 4) > + return -EINVAL; > + > + /* Handle the V2H case with extra interrupt block. */ > + if (priv->model == RCAR_GYROADC_MODEL_R8A7792) > + maxreg = RCAR_GYROADC_INTENR; > + > + if (reg > maxreg) > + return -EINVAL; > + > + *readval = readl(priv->regs + reg); > + > + return 0; > +} > + > +static const struct iio_info rcar_gyroadc_iio_info = { > + .driver_module = THIS_MODULE, > + .read_raw = rcar_gyroadc_read_raw, > + .debugfs_reg_access = rcar_gyroadc_reg_access, > +}; > + > +static const struct of_device_id rcar_gyroadc_match[] = { > + { > + /* R-Car compatible GyroADC */ > + .compatible = "renesas,rcar-gyroadc", > + .data = (void *)RCAR_GYROADC_MODEL_DEFAULT, > + }, { > + /* R-Car V2H specialty with interrupt registers. */ > + .compatible = "renesas,r8a7792-gyroadc", > + .data = (void *)RCAR_GYROADC_MODEL_R8A7792, > + }, { > + /* sentinel */ > + } > +}; > + > +MODULE_DEVICE_TABLE(of, rcar_gyroadc_match); > + > +static const struct of_device_id rcar_gyroadc_child_match[] = { > + /* Mode 1 ADCs */ > + { > + .compatible = "fujitsu,mb88101a", > + .data = (void *)RCAR_GYROADC_MODE_SELECT_1_MB88101A, > + }, > + /* Mode 2 ADCs */ > + { > + .compatible = "ti,adcs7476", > + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, > + }, { > + .compatible = "ti,adc121", > + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, > + }, { > + .compatible = "adi,ad7476", > + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, > + }, > + /* Mode 3 ADCs */ > + { > + .compatible = "maxim,max1162", > + .data = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162, > + }, { > + .compatible = "maxim,max11100", > + .data = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162, > + }, > + { /* sentinel */ } > +}; > + > +static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) > +{ > + const struct of_device_id *of_id; > + const struct iio_chan_spec *channels; > + struct rcar_gyroadc *priv = iio_priv(indio_dev); > + struct device *dev = priv->dev; > + struct device_node *np = dev->of_node; > + struct device_node *child; > + struct regulator *vref; > + unsigned int reg; > + unsigned int adcmode, childmode; > + unsigned int sample_width; > + unsigned int num_channels; > + int ret, first = 1; > + > + for_each_child_of_node(np, child) { > + of_id = of_match_node(rcar_gyroadc_child_match, child); > + if (!of_id) { > + dev_err(dev, "Ignoring unsupported ADC \"%s\".", > + child->name); > + continue; > + } > + > + childmode = (unsigned int)of_id->data; > + switch (childmode) { > + case RCAR_GYROADC_MODE_SELECT_1_MB88101A: > + sample_width = 12; > + channels = rcar_gyroadc_iio_channels_1; > + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_1); > + break; > + case RCAR_GYROADC_MODE_SELECT_2_ADCS7476: > + sample_width = 15; > + channels = rcar_gyroadc_iio_channels_2; > + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_2); > + break; > + case RCAR_GYROADC_MODE_SELECT_3_MAX1162: > + sample_width = 16; > + channels = rcar_gyroadc_iio_channels_3; > + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3); > + break; > + } > + > + /* > + * MB88101 is special in that it's only a single chip taking > + * up all the CHS lines. Thus, the DT binding is also special > + * and has no reg property. If we run into such ADC, handle > + * it here. > + */ > + if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) { > + reg = 0; > + } else { > + ret = of_property_read_u32(child, "reg", ®); > + if (ret) { > + dev_err(dev, > + "Failed to get child reg property of ADC \"%s\".\n", > + child->name); > + return ret; > + } > + > + /* Channel number is too high. */ > + if (reg >= num_channels) { > + dev_err(dev, > + "Only %i channels supported with %s, but reg = <%i>.\n", > + num_channels, child->name, reg); > + return ret; > + } > + } > + > + /* Child node selected different mode than the rest. */ > + if (!first && (adcmode != childmode)) { > + dev_err(dev, > + "Channel %i uses different ADC mode than the rest.\n", > + reg); > + return ret; > + } > + > + /* Channel is valid, grab the regulator. */ > + dev->of_node = child; > + vref = devm_regulator_get(dev, "vref"); > + dev->of_node = np; > + if (IS_ERR(vref)) { > + dev_dbg(dev, "Channel %i 'vref' supply not connected.\n", > + reg); > + return PTR_ERR(vref); > + } > + > + priv->vref[reg] = vref; > + > + if (!first) > + continue; > + > + /* First child node which passed sanity tests. */ > + adcmode = childmode; > + first = 0; > + > + priv->num_channels = num_channels; > + priv->mode = childmode; > + priv->sample_width = sample_width; > + > + indio_dev->channels = channels; > + indio_dev->num_channels = num_channels; > + > + /* > + * MB88101 is special and we only have one such device > + * attached to the GyroADC at a time, so if we found it, > + * we can stop parsing here. > + */ > + if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) > + break; > + } > + > + if (first) { > + dev_err(dev, "No valid ADC channels found, aborting.\n"); > + return -EINVAL; > + } > + > + return 0; > +} > + > +static void rcar_gyroadc_deinit_supplies(struct iio_dev *indio_dev) > +{ > + struct rcar_gyroadc *priv = iio_priv(indio_dev); > + unsigned int i; > + > + for (i = 0; i < priv->num_channels; i++) { > + if (!priv->vref[i]) > + continue; > + > + regulator_disable(priv->vref[i]); > + } > +} > + > +static int rcar_gyroadc_init_supplies(struct iio_dev *indio_dev) > +{ > + struct rcar_gyroadc *priv = iio_priv(indio_dev); > + struct device *dev = priv->dev; > + unsigned int i; > + int ret; > + > + for (i = 0; i < priv->num_channels; i++) { > + if (!priv->vref[i]) > + continue; > + > + ret = regulator_enable(priv->vref[i]); > + if (ret) { > + dev_err(dev, "Failed to enable regulator %i (ret=%i)\n", > + i, ret); > + goto err; > + } > + } > + > + return 0; > + > +err: > + rcar_gyroadc_deinit_supplies(indio_dev); > + return ret; > +} > + > +static int rcar_gyroadc_probe(struct platform_device *pdev) > +{ > + const struct of_device_id *of_id = > + of_match_device(rcar_gyroadc_match, &pdev->dev); > + struct device *dev = &pdev->dev; > + struct rcar_gyroadc *priv; > + struct iio_dev *indio_dev; > + struct resource *mem; > + int ret; > + > + indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); > + if (!indio_dev) { > + dev_err(dev, "Failed to allocate IIO device.\n"); > + return -ENOMEM; > + } > + > + priv = iio_priv(indio_dev); > + priv->dev = dev; > + > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + priv->regs = devm_ioremap_resource(dev, mem); > + if (IS_ERR(priv->regs)) > + return PTR_ERR(priv->regs); > + > + priv->iclk = devm_clk_get(dev, "if"); > + if (IS_ERR(priv->iclk)) { > + ret = PTR_ERR(priv->iclk); > + if (ret != -EPROBE_DEFER) > + dev_err(dev, "Failed to get IF clock (ret=%i)\n", ret); > + return ret; > + } > + > + ret = rcar_gyroadc_parse_subdevs(indio_dev); > + if (ret) > + return ret; > + > + ret = rcar_gyroadc_init_supplies(indio_dev); > + if (ret) > + return ret; > + > + priv->model = (enum rcar_gyroadc_model)of_id->data; > + > + platform_set_drvdata(pdev, indio_dev); > + > + indio_dev->name = DRIVER_NAME; > + indio_dev->dev.parent = dev; > + indio_dev->dev.of_node = pdev->dev.of_node; > + indio_dev->info = &rcar_gyroadc_iio_info; > + indio_dev->modes = INDIO_DIRECT_MODE; > + > + ret = clk_prepare_enable(priv->iclk); > + if (ret) { > + dev_err(dev, "Could not prepare or enable the IF clock.\n"); > + goto err_clk_if_enable; > + } > + > + pm_runtime_set_autosuspend_delay(dev, RCAR_GYROADC_RUNTIME_PM_DELAY_MS); > + pm_runtime_use_autosuspend(dev); > + pm_runtime_enable(dev); > + > + pm_runtime_get_sync(dev); > + rcar_gyroadc_hw_init(priv); > + rcar_gyroadc_hw_start(priv); > + > + ret = iio_device_register(indio_dev); > + if (ret) { > + dev_err(dev, "Couldn't register IIO device.\n"); > + goto err_iio_device_register; > + } > + > + pm_runtime_put_sync(dev); > + > + return 0; > + > +err_iio_device_register: > + rcar_gyroadc_hw_stop(priv); > + pm_runtime_put_sync(dev); > + pm_runtime_disable(dev); > + pm_runtime_set_suspended(dev); > + clk_disable_unprepare(priv->iclk); > +err_clk_if_enable: > + rcar_gyroadc_deinit_supplies(indio_dev); > + > + return ret; > +} > + > +static int rcar_gyroadc_remove(struct platform_device *pdev) > +{ > + struct iio_dev *indio_dev = platform_get_drvdata(pdev); > + struct rcar_gyroadc *priv = iio_priv(indio_dev); > + struct device *dev = priv->dev; > + > + iio_device_unregister(indio_dev); > + pm_runtime_get_sync(dev); > + rcar_gyroadc_hw_stop(priv); > + pm_runtime_put_sync(dev); > + pm_runtime_disable(dev); > + pm_runtime_set_suspended(dev); > + clk_disable_unprepare(priv->iclk); > + rcar_gyroadc_deinit_supplies(indio_dev); > + > + return 0; > +} > + > +#if defined(CONFIG_PM) > +static int rcar_gyroadc_suspend(struct device *dev) > +{ > + struct iio_dev *indio_dev = dev_get_drvdata(dev); > + struct rcar_gyroadc *priv = iio_priv(indio_dev); > + > + rcar_gyroadc_hw_stop(priv); > + > + return 0; > +} > + > +static int rcar_gyroadc_resume(struct device *dev) > +{ > + struct iio_dev *indio_dev = dev_get_drvdata(dev); > + struct rcar_gyroadc *priv = iio_priv(indio_dev); > + > + rcar_gyroadc_hw_start(priv); > + > + return 0; > +} > +#endif > + > +static const struct dev_pm_ops rcar_gyroadc_pm_ops = { > + SET_RUNTIME_PM_OPS(rcar_gyroadc_suspend, rcar_gyroadc_resume, NULL) > +}; > + > +static struct platform_driver rcar_gyroadc_driver = { > + .probe = rcar_gyroadc_probe, > + .remove = rcar_gyroadc_remove, > + .driver = { > + .name = DRIVER_NAME, > + .of_match_table = rcar_gyroadc_match, > + .pm = &rcar_gyroadc_pm_ops, > + }, > +}; > + > +module_platform_driver(rcar_gyroadc_driver); > + > +MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); > +MODULE_DESCRIPTION("Renesas R-Car GyroADC driver"); > +MODULE_LICENSE("GPL"); >
On 01/21/2017 02:04 PM, Jonathan Cameron wrote: > On 15/01/17 17:05, Marek Vasut wrote: >> Add IIO driver for the Renesas RCar GyroADC block. This block is a >> simple 4/8-channel ADC which samples 12/15/24 bits of data every >> cycle from all channels. >> >> Signed-off-by: Marek Vasut <marek.vasut@gmail.com> >> Cc: Geert Uytterhoeven <geert+renesas@glider.be> >> Cc: Simon Horman <horms+renesas@verge.net.au> >> Cc: Jonathan Cameron <jic23@kernel.org> >> Cc: linux-renesas-soc@vger.kernel.org > Hi Marek, > > One thing I hadn't picked up on earlier. This hasn't been going to the devicetree > list or maintainers. I'd like an ack from them on the bindings as they are a little > 'unusual' given the odd nature of the part. > > Cc'd Rob, Mark and the list. I sent V7 where I split out the bindings into a separate patch and sent that to the DT list just not. > Jonathan >> --- >> V2: - Spelling fixes >> - Rename the driver source file to rcar-gyroadc >> - Rework the channel sample width handling >> - Use iio_device_claim_mode_direct() >> - Rename "renesas,rcar-gyroadc" to "renesas,r8a7791-gyroadc" and >> rename "renesas,rcar-gyroadc-r8a7792" to "renesas,r8a7792-gyroadc" >> to match the new naming scheme (WARNING: scif uses the old one!) >> - Switch to using regulators for channel voltage reference, add new >> properties renesas,gyroadc-vref-chN-supply for N in 0..7 >> - Handle vref regulators as optional to, make channels without >> vref regulator return EINVAL on read. >> - Fix module license to GPL >> - Drop interrupt.h include >> - Rename clk to iclk >> - Rename RCar to R-Car >> - Rework the invalid mode handling >> - Don't print error message on EPROBE_DEFER >> - Drop fclk handling, use runtime PM for that instead >> V3: - More R-Car spelling fixes >> - Flip checks for V2H, since that's the only one that has >> interrupt registers >> - Replace if-else statement with switch statement in init_mode >> - Use unsigned types where applicable >> - Rework timing calculation slightly to drop if-else block >> - Use DIV_ROUND_CLOSEST >> V4: - Add renesas,rcar-gyroadc fallback compatible string into the bindings >> - Rework the ADC bindings to use per-channel subdevs >> - Support more compatible ADC chips >> V5: - Reword the DT bindings, improve the description of the modes >> - Improve the description in Kconfig >> - Implement special DT bindings for the MB88101A 4-channel ADC and >> add special handling for this chip into the driver. >> - Add missing ADC stop on failure, wrap it into a function >> - Fail hard in case the DT properties are incorrect or missing >> - Fix reporting of scale, so that channel * scale value is in mV >> - Use fractional scale instead of int plus nano >> - Use pm_runtime to disable the sampling 2 seconds after last used >> V6: - Replace the indio_dev->name with "rcar-gyroadc" instead of OF node name >> --- >> .../bindings/iio/adc/renesas,gyroadc.txt | 93 +++ >> MAINTAINERS | 6 + >> drivers/iio/adc/Kconfig | 13 + >> drivers/iio/adc/Makefile | 1 + >> drivers/iio/adc/rcar-gyroadc.c | 631 +++++++++++++++++++++ >> 5 files changed, 744 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt >> create mode 100644 drivers/iio/adc/rcar-gyroadc.c >> >> diff --git a/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt b/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt >> new file mode 100644 >> index 000000000000..081947367135 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt >> @@ -0,0 +1,93 @@ >> +* Renesas RCar GyroADC device driver >> + >> +Required properties: >> +- compatible: Should be "renesas,<chip>-gyroadc", "renesas,rcar-gyroadc". >> + Use "renesas,r8a7792-gyroadc" for a GyroADC with interrupt >> + block found in R8A7792. >> +- reg: Address and length of the register set for the device >> +- clocks: References to all the clocks specified in the clock-names >> + property as specified in >> + Documentation/devicetree/bindings/clock/clock-bindings.txt. >> +- clock-names: Shall contain "fck" and "if". The "fck" is the GyroADC block >> + clock, the "if" is the interface clock. >> +- power-domains: Must contain a reference to the PM domain, if available. >> +- #address-cells: Should be <1> (setting for the subnodes) for all ADCs >> + except for "fujitsu,mb88101a". Should be <0> (setting for >> + only subnode) for "fujitsu,mb88101a". >> +- #size-cells: Should be <0> (setting for the subnodes) >> + >> +Sub-nodes: >> +Optionally you can define subnodes which select the connected ADC type and >> +reference voltage for the GyroADC channels. >> + >> +Required properties for subnodes: >> +- compatible: Should be either of: >> + "fujitsu,mb88101a" >> + - Fujitsu MB88101A compatible mode, >> + 12bit sampling, up to 4 channels can be sampled in >> + round-robin fashion. One Fujitsu chip supplies four >> + GyroADC channels with data as it contains four ADCs >> + on the chip and thus for 4-channel operation, single >> + MB88101A is required. The Cx chipselect lines of the >> + MB88101A connect directly to two CHS lines of the >> + GyroADC, no demuxer is required. The data out line >> + of each MB88101A connects to a shared input pin of >> + the GyroADC. >> + "ti,adcs7476" or "ti,adc121" or "adi,ad7476" >> + - TI ADCS7476 / TI ADC121 / ADI AD7476 compatible mode, >> + 15bit sampling, up to 8 channels can be sampled in >> + round-robin fashion. One TI/ADI chip supplies single >> + ADC channel with data, thus for 8-channel operation, >> + 8 chips are required. A 3:8 chipselect demuxer is >> + required to connect the nCS line of the TI/ADI chips >> + to the GyroADC, while MISO line of each TI/ADI ADC >> + connects to a shared input pin of the GyroADC. >> + "maxim,max1162" or "maxim,max11100" >> + - Maxim MAX1162 / Maxim MAX11100 compatible mode, >> + 16bit sampling, up to 8 channels can be sampled in >> + round-robin fashion. One Maxim chip supplies single >> + ADC channel with data, thus for 8-channel operation, >> + 8 chips are required. A 3:8 chipselect demuxer is >> + required to connect the nCS line of the MAX chips >> + to the GyroADC, while MISO line of each Maxim ADC >> + connects to a shared input pin of the GyroADC. >> +- reg: Should be the number of the analog input. Should be present >> + for all ADCs except "fujitsu,mb88101a". >> +- vref-supply: Reference to the channel reference voltage regulator. >> + >> +Example: >> + vref_max1162: regulator-vref-max1162 { >> + compatible = "regulator-fixed"; >> + >> + regulator-name = "MAX1162 Vref"; >> + regulator-min-microvolt = <4096000>; >> + regulator-max-microvolt = <4096000>; >> + }; >> + >> + &adc { >> + compatible = "renesas,r8a7791-gyroadc", "renesas,rcar-gyroadc"; >> + reg = <0 0xe6e54000 0 64>; >> + clocks = <&mstp9_clks R8A7791_CLK_GYROADC>, <&clk_65m>; >> + clock-names = "fck", "if"; >> + power-domains = <&sysc R8A7791_PD_ALWAYS_ON>; >> + >> + pinctrl-0 = <&adc_pins>; >> + pinctrl-names = "default"; >> + >> + status = "okay"; >> + >> + #address-cells = <1>; >> + #size-cells = <0>; >> + >> + adc@0 { >> + reg = <0>; >> + compatible = "maxim,max1162"; >> + vref-supply = <&vref_max1162>; >> + }; >> + >> + adc@1 { >> + reg = <1>; >> + compatible = "maxim,max1162"; >> + vref-supply = <&vref_max1162>; >> + }; >> + }; >> diff --git a/MAINTAINERS b/MAINTAINERS >> index 890fc9e3c191..498e8a755eb6 100644 >> --- a/MAINTAINERS >> +++ b/MAINTAINERS >> @@ -10276,6 +10276,12 @@ L: linux-renesas-soc@vger.kernel.org >> F: drivers/net/ethernet/renesas/ >> F: include/linux/sh_eth.h >> >> +RENESAS R-CAR GYROADC DRIVER >> +M: Marek Vasut <marek.vasut@gmail.com> >> +L: linux-iio@vger.kernel.org >> +S: Supported >> +F: drivers/iio/adc/rcar_gyro_adc.c >> + >> RENESAS USB2 PHY DRIVER >> M: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> >> L: linux-renesas-soc@vger.kernel.org >> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig >> index 99c051490eff..2fbc11f42740 100644 >> --- a/drivers/iio/adc/Kconfig >> +++ b/drivers/iio/adc/Kconfig >> @@ -408,6 +408,19 @@ config QCOM_SPMI_VADC >> To compile this driver as a module, choose M here: the module will >> be called qcom-spmi-vadc. >> >> +config RCAR_GYRO_ADC >> + tristate "Renesas R-Car GyroADC driver" >> + depends on ARCH_RCAR_GEN2 || (ARM && COMPILE_TEST) >> + help >> + Say yes here to build support for the GyroADC found in Renesas >> + R-Car Gen2 SoCs. This block is a simple SPI offload engine for >> + reading data out of attached compatible ADCs in a round-robin >> + fashion. Up to 4 or 8 ADC channels are supported by this block, >> + depending on which ADCs are attached. >> + >> + To compile this driver as a module, choose M here: the >> + module will be called rcar-gyroadc. >> + >> config ROCKCHIP_SARADC >> tristate "Rockchip SARADC driver" >> depends on ARCH_ROCKCHIP || (ARM && COMPILE_TEST) >> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile >> index 7a40c04c311f..13db7c2bffc8 100644 >> --- a/drivers/iio/adc/Makefile >> +++ b/drivers/iio/adc/Makefile >> @@ -39,6 +39,7 @@ obj-$(CONFIG_NAU7802) += nau7802.o >> obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o >> obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o >> obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o >> +obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o >> obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o >> obj-$(CONFIG_STX104) += stx104.o >> obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o >> diff --git a/drivers/iio/adc/rcar-gyroadc.c b/drivers/iio/adc/rcar-gyroadc.c >> new file mode 100644 >> index 000000000000..0c44f72c32a8 >> --- /dev/null >> +++ b/drivers/iio/adc/rcar-gyroadc.c >> @@ -0,0 +1,631 @@ >> +/* >> + * Renesas R-Car GyroADC driver >> + * >> + * Copyright 2016 Marek Vasut <marek.vasut@gmail.com> >> + * >> + * This program is free software; you can redistribute it and/or modify >> + * it under the terms of the GNU General Public License as published by >> + * the Free Software Foundation; either version 2 of the License, or >> + * (at your option) any later version. >> + * >> + * This program is distributed in the hope that it will be useful, >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> + * GNU General Public License for more details. >> + */ >> + >> +#include <linux/module.h> >> +#include <linux/platform_device.h> >> +#include <linux/delay.h> >> +#include <linux/kernel.h> >> +#include <linux/slab.h> >> +#include <linux/io.h> >> +#include <linux/clk.h> >> +#include <linux/of.h> >> +#include <linux/of_irq.h> >> +#include <linux/regulator/consumer.h> >> +#include <linux/of_platform.h> >> +#include <linux/err.h> >> +#include <linux/pm_runtime.h> >> + >> +#include <linux/iio/iio.h> >> +#include <linux/iio/sysfs.h> >> +#include <linux/iio/trigger.h> >> + >> +#define DRIVER_NAME "rcar-gyroadc" >> + >> +/* GyroADC registers. */ >> +#define RCAR_GYROADC_MODE_SELECT 0x00 >> +#define RCAR_GYROADC_MODE_SELECT_1_MB88101A 0x0 >> +#define RCAR_GYROADC_MODE_SELECT_2_ADCS7476 0x1 >> +#define RCAR_GYROADC_MODE_SELECT_3_MAX1162 0x3 >> + >> +#define RCAR_GYROADC_START_STOP 0x04 >> +#define RCAR_GYROADC_START_STOP_START BIT(0) >> + >> +#define RCAR_GYROADC_CLOCK_LENGTH 0x08 >> +#define RCAR_GYROADC_1_25MS_LENGTH 0x0c >> + >> +#define RCAR_GYROADC_REALTIME_DATA(ch) (0x10 + ((ch) * 4)) >> +#define RCAR_GYROADC_100MS_ADDED_DATA(ch) (0x30 + ((ch) * 4)) >> +#define RCAR_GYROADC_10MS_AVG_DATA(ch) (0x50 + ((ch) * 4)) >> + >> +#define RCAR_GYROADC_FIFO_STATUS 0x70 >> +#define RCAR_GYROADC_FIFO_STATUS_EMPTY(ch) BIT(0 + (4 * (ch))) >> +#define RCAR_GYROADC_FIFO_STATUS_FULL(ch) BIT(1 + (4 * (ch))) >> +#define RCAR_GYROADC_FIFO_STATUS_ERROR(ch) BIT(2 + (4 * (ch))) >> + >> +#define RCAR_GYROADC_INTR 0x74 >> +#define RCAR_GYROADC_INTR_INT BIT(0) >> + >> +#define RCAR_GYROADC_INTENR 0x78 >> +#define RCAR_GYROADC_INTENR_INTEN BIT(0) >> + >> +#define RCAR_GYROADC_SAMPLE_RATE 800 /* Hz */ >> + >> +#define RCAR_GYROADC_RUNTIME_PM_DELAY_MS 2000 >> + >> +enum rcar_gyroadc_model { >> + RCAR_GYROADC_MODEL_DEFAULT, >> + RCAR_GYROADC_MODEL_R8A7792, >> +}; >> + >> +struct rcar_gyroadc { >> + struct device *dev; >> + void __iomem *regs; >> + struct clk *iclk; >> + struct regulator *vref[8]; >> + unsigned int num_channels; >> + enum rcar_gyroadc_model model; >> + unsigned int mode; >> + unsigned int sample_width; >> +}; >> + >> +static void rcar_gyroadc_hw_init(struct rcar_gyroadc *priv) >> +{ >> + const unsigned long clk_mhz = clk_get_rate(priv->iclk) / 1000000; >> + const unsigned long clk_mul = >> + (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) ? 10 : 5; >> + unsigned long clk_len = clk_mhz * clk_mul; >> + >> + /* >> + * According to the R-Car Gen2 datasheet Rev. 1.01, Sept 08 2014, >> + * page 77-7, clock length must be even number. If it's odd number, >> + * add one. >> + */ >> + if (clk_len & 1) >> + clk_len++; >> + >> + /* Stop the GyroADC. */ >> + writel(0, priv->regs + RCAR_GYROADC_START_STOP); >> + >> + /* Disable IRQ on V2H. */ >> + if (priv->model == RCAR_GYROADC_MODEL_R8A7792) >> + writel(0, priv->regs + RCAR_GYROADC_INTENR); >> + >> + /* Set mode and timing. */ >> + writel(priv->mode, priv->regs + RCAR_GYROADC_MODE_SELECT); >> + writel(clk_len, priv->regs + RCAR_GYROADC_CLOCK_LENGTH); >> + writel(clk_mhz * 1250, priv->regs + RCAR_GYROADC_1_25MS_LENGTH); >> +} >> + >> +static void rcar_gyroadc_hw_start(struct rcar_gyroadc *priv) >> +{ >> + /* Start sampling. */ >> + writel(RCAR_GYROADC_START_STOP_START, >> + priv->regs + RCAR_GYROADC_START_STOP); >> + >> + /* >> + * Wait for the first conversion to complete. This is longer than >> + * the 1.25 mS in the datasheet because 1.25 mS is not enough for >> + * the hardware to deliver the first sample and the hardware does >> + * then return zeroes instead of valid data. >> + */ >> + mdelay(3); >> +} >> + >> +static void rcar_gyroadc_hw_stop(struct rcar_gyroadc *priv) >> +{ >> + /* Stop the GyroADC. */ >> + writel(0, priv->regs + RCAR_GYROADC_START_STOP); >> +} >> + >> +#define RCAR_GYROADC_CHAN(_idx) { \ >> + .type = IIO_VOLTAGE, \ >> + .indexed = 1, \ >> + .channel = (_idx), \ >> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ >> + BIT(IIO_CHAN_INFO_SCALE), \ >> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ >> +} >> + >> +static const struct iio_chan_spec rcar_gyroadc_iio_channels_1[] = { >> + RCAR_GYROADC_CHAN(0), >> + RCAR_GYROADC_CHAN(1), >> + RCAR_GYROADC_CHAN(2), >> + RCAR_GYROADC_CHAN(3), >> +}; >> + >> +static const struct iio_chan_spec rcar_gyroadc_iio_channels_2[] = { >> + RCAR_GYROADC_CHAN(0), >> + RCAR_GYROADC_CHAN(1), >> + RCAR_GYROADC_CHAN(2), >> + RCAR_GYROADC_CHAN(3), >> + RCAR_GYROADC_CHAN(4), >> + RCAR_GYROADC_CHAN(5), >> + RCAR_GYROADC_CHAN(6), >> + RCAR_GYROADC_CHAN(7), >> +}; >> + >> +static const struct iio_chan_spec rcar_gyroadc_iio_channels_3[] = { >> + RCAR_GYROADC_CHAN(0), >> + RCAR_GYROADC_CHAN(1), >> + RCAR_GYROADC_CHAN(2), >> + RCAR_GYROADC_CHAN(3), >> + RCAR_GYROADC_CHAN(4), >> + RCAR_GYROADC_CHAN(5), >> + RCAR_GYROADC_CHAN(6), >> + RCAR_GYROADC_CHAN(7), >> +}; >> + >> +static int rcar_gyroadc_set_power(struct rcar_gyroadc *priv, bool on) >> +{ >> + struct device *dev = priv->dev; >> + int ret; >> + >> + if (on) { >> + ret = pm_runtime_get_sync(dev); >> + if (ret < 0) >> + pm_runtime_put_noidle(dev); >> + } else { >> + pm_runtime_mark_last_busy(dev); >> + ret = pm_runtime_put_autosuspend(dev); >> + } >> + >> + return ret; >> +} >> + >> +static int rcar_gyroadc_read_raw(struct iio_dev *indio_dev, >> + struct iio_chan_spec const *chan, >> + int *val, int *val2, long mask) >> +{ >> + struct rcar_gyroadc *priv = iio_priv(indio_dev); >> + struct regulator *consumer; >> + unsigned int datareg = RCAR_GYROADC_REALTIME_DATA(chan->channel); >> + unsigned int vref; >> + int ret; >> + >> + /* >> + * MB88101 is special in that it has only single regulator for >> + * all four channels. >> + */ >> + if (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) >> + consumer = priv->vref[0]; >> + else >> + consumer = priv->vref[chan->channel]; >> + >> + switch (mask) { >> + case IIO_CHAN_INFO_RAW: >> + if (chan->type != IIO_VOLTAGE) >> + return -EINVAL; >> + >> + /* Channel not connected. */ >> + if (!consumer) >> + return -EINVAL; >> + >> + ret = iio_device_claim_direct_mode(indio_dev); >> + if (ret) >> + return ret; >> + >> + ret = rcar_gyroadc_set_power(priv, true); >> + if (ret < 0) { >> + iio_device_release_direct_mode(indio_dev); >> + return ret; >> + } >> + >> + *val = readl(priv->regs + datareg); >> + *val &= BIT(priv->sample_width) - 1; >> + >> + ret = rcar_gyroadc_set_power(priv, false); >> + iio_device_release_direct_mode(indio_dev); >> + if (ret < 0) >> + return ret; >> + >> + return IIO_VAL_INT; >> + case IIO_CHAN_INFO_SCALE: >> + /* Channel not connected. */ >> + if (!consumer) >> + return -EINVAL; >> + >> + vref = regulator_get_voltage(consumer); >> + *val = vref / 1000; >> + *val2 = 1 << priv->sample_width; >> + >> + return IIO_VAL_FRACTIONAL; >> + case IIO_CHAN_INFO_SAMP_FREQ: >> + *val = RCAR_GYROADC_SAMPLE_RATE; >> + >> + return IIO_VAL_INT; >> + default: >> + return -EINVAL; >> + } >> +} >> + >> +static int rcar_gyroadc_reg_access(struct iio_dev *indio_dev, >> + unsigned int reg, unsigned int writeval, >> + unsigned int *readval) >> +{ >> + struct rcar_gyroadc *priv = iio_priv(indio_dev); >> + unsigned int maxreg = RCAR_GYROADC_FIFO_STATUS; >> + >> + if (readval == NULL) >> + return -EINVAL; >> + >> + if (reg % 4) >> + return -EINVAL; >> + >> + /* Handle the V2H case with extra interrupt block. */ >> + if (priv->model == RCAR_GYROADC_MODEL_R8A7792) >> + maxreg = RCAR_GYROADC_INTENR; >> + >> + if (reg > maxreg) >> + return -EINVAL; >> + >> + *readval = readl(priv->regs + reg); >> + >> + return 0; >> +} >> + >> +static const struct iio_info rcar_gyroadc_iio_info = { >> + .driver_module = THIS_MODULE, >> + .read_raw = rcar_gyroadc_read_raw, >> + .debugfs_reg_access = rcar_gyroadc_reg_access, >> +}; >> + >> +static const struct of_device_id rcar_gyroadc_match[] = { >> + { >> + /* R-Car compatible GyroADC */ >> + .compatible = "renesas,rcar-gyroadc", >> + .data = (void *)RCAR_GYROADC_MODEL_DEFAULT, >> + }, { >> + /* R-Car V2H specialty with interrupt registers. */ >> + .compatible = "renesas,r8a7792-gyroadc", >> + .data = (void *)RCAR_GYROADC_MODEL_R8A7792, >> + }, { >> + /* sentinel */ >> + } >> +}; >> + >> +MODULE_DEVICE_TABLE(of, rcar_gyroadc_match); >> + >> +static const struct of_device_id rcar_gyroadc_child_match[] = { >> + /* Mode 1 ADCs */ >> + { >> + .compatible = "fujitsu,mb88101a", >> + .data = (void *)RCAR_GYROADC_MODE_SELECT_1_MB88101A, >> + }, >> + /* Mode 2 ADCs */ >> + { >> + .compatible = "ti,adcs7476", >> + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, >> + }, { >> + .compatible = "ti,adc121", >> + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, >> + }, { >> + .compatible = "adi,ad7476", >> + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, >> + }, >> + /* Mode 3 ADCs */ >> + { >> + .compatible = "maxim,max1162", >> + .data = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162, >> + }, { >> + .compatible = "maxim,max11100", >> + .data = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162, >> + }, >> + { /* sentinel */ } >> +}; >> + >> +static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) >> +{ >> + const struct of_device_id *of_id; >> + const struct iio_chan_spec *channels; >> + struct rcar_gyroadc *priv = iio_priv(indio_dev); >> + struct device *dev = priv->dev; >> + struct device_node *np = dev->of_node; >> + struct device_node *child; >> + struct regulator *vref; >> + unsigned int reg; >> + unsigned int adcmode, childmode; >> + unsigned int sample_width; >> + unsigned int num_channels; >> + int ret, first = 1; >> + >> + for_each_child_of_node(np, child) { >> + of_id = of_match_node(rcar_gyroadc_child_match, child); >> + if (!of_id) { >> + dev_err(dev, "Ignoring unsupported ADC \"%s\".", >> + child->name); >> + continue; >> + } >> + >> + childmode = (unsigned int)of_id->data; >> + switch (childmode) { >> + case RCAR_GYROADC_MODE_SELECT_1_MB88101A: >> + sample_width = 12; >> + channels = rcar_gyroadc_iio_channels_1; >> + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_1); >> + break; >> + case RCAR_GYROADC_MODE_SELECT_2_ADCS7476: >> + sample_width = 15; >> + channels = rcar_gyroadc_iio_channels_2; >> + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_2); >> + break; >> + case RCAR_GYROADC_MODE_SELECT_3_MAX1162: >> + sample_width = 16; >> + channels = rcar_gyroadc_iio_channels_3; >> + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3); >> + break; >> + } >> + >> + /* >> + * MB88101 is special in that it's only a single chip taking >> + * up all the CHS lines. Thus, the DT binding is also special >> + * and has no reg property. If we run into such ADC, handle >> + * it here. >> + */ >> + if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) { >> + reg = 0; >> + } else { >> + ret = of_property_read_u32(child, "reg", ®); >> + if (ret) { >> + dev_err(dev, >> + "Failed to get child reg property of ADC \"%s\".\n", >> + child->name); >> + return ret; >> + } >> + >> + /* Channel number is too high. */ >> + if (reg >= num_channels) { >> + dev_err(dev, >> + "Only %i channels supported with %s, but reg = <%i>.\n", >> + num_channels, child->name, reg); >> + return ret; >> + } >> + } >> + >> + /* Child node selected different mode than the rest. */ >> + if (!first && (adcmode != childmode)) { >> + dev_err(dev, >> + "Channel %i uses different ADC mode than the rest.\n", >> + reg); >> + return ret; >> + } >> + >> + /* Channel is valid, grab the regulator. */ >> + dev->of_node = child; >> + vref = devm_regulator_get(dev, "vref"); >> + dev->of_node = np; >> + if (IS_ERR(vref)) { >> + dev_dbg(dev, "Channel %i 'vref' supply not connected.\n", >> + reg); >> + return PTR_ERR(vref); >> + } >> + >> + priv->vref[reg] = vref; >> + >> + if (!first) >> + continue; >> + >> + /* First child node which passed sanity tests. */ >> + adcmode = childmode; >> + first = 0; >> + >> + priv->num_channels = num_channels; >> + priv->mode = childmode; >> + priv->sample_width = sample_width; >> + >> + indio_dev->channels = channels; >> + indio_dev->num_channels = num_channels; >> + >> + /* >> + * MB88101 is special and we only have one such device >> + * attached to the GyroADC at a time, so if we found it, >> + * we can stop parsing here. >> + */ >> + if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) >> + break; >> + } >> + >> + if (first) { >> + dev_err(dev, "No valid ADC channels found, aborting.\n"); >> + return -EINVAL; >> + } >> + >> + return 0; >> +} >> + >> +static void rcar_gyroadc_deinit_supplies(struct iio_dev *indio_dev) >> +{ >> + struct rcar_gyroadc *priv = iio_priv(indio_dev); >> + unsigned int i; >> + >> + for (i = 0; i < priv->num_channels; i++) { >> + if (!priv->vref[i]) >> + continue; >> + >> + regulator_disable(priv->vref[i]); >> + } >> +} >> + >> +static int rcar_gyroadc_init_supplies(struct iio_dev *indio_dev) >> +{ >> + struct rcar_gyroadc *priv = iio_priv(indio_dev); >> + struct device *dev = priv->dev; >> + unsigned int i; >> + int ret; >> + >> + for (i = 0; i < priv->num_channels; i++) { >> + if (!priv->vref[i]) >> + continue; >> + >> + ret = regulator_enable(priv->vref[i]); >> + if (ret) { >> + dev_err(dev, "Failed to enable regulator %i (ret=%i)\n", >> + i, ret); >> + goto err; >> + } >> + } >> + >> + return 0; >> + >> +err: >> + rcar_gyroadc_deinit_supplies(indio_dev); >> + return ret; >> +} >> + >> +static int rcar_gyroadc_probe(struct platform_device *pdev) >> +{ >> + const struct of_device_id *of_id = >> + of_match_device(rcar_gyroadc_match, &pdev->dev); >> + struct device *dev = &pdev->dev; >> + struct rcar_gyroadc *priv; >> + struct iio_dev *indio_dev; >> + struct resource *mem; >> + int ret; >> + >> + indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); >> + if (!indio_dev) { >> + dev_err(dev, "Failed to allocate IIO device.\n"); >> + return -ENOMEM; >> + } >> + >> + priv = iio_priv(indio_dev); >> + priv->dev = dev; >> + >> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); >> + priv->regs = devm_ioremap_resource(dev, mem); >> + if (IS_ERR(priv->regs)) >> + return PTR_ERR(priv->regs); >> + >> + priv->iclk = devm_clk_get(dev, "if"); >> + if (IS_ERR(priv->iclk)) { >> + ret = PTR_ERR(priv->iclk); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to get IF clock (ret=%i)\n", ret); >> + return ret; >> + } >> + >> + ret = rcar_gyroadc_parse_subdevs(indio_dev); >> + if (ret) >> + return ret; >> + >> + ret = rcar_gyroadc_init_supplies(indio_dev); >> + if (ret) >> + return ret; >> + >> + priv->model = (enum rcar_gyroadc_model)of_id->data; >> + >> + platform_set_drvdata(pdev, indio_dev); >> + >> + indio_dev->name = DRIVER_NAME; >> + indio_dev->dev.parent = dev; >> + indio_dev->dev.of_node = pdev->dev.of_node; >> + indio_dev->info = &rcar_gyroadc_iio_info; >> + indio_dev->modes = INDIO_DIRECT_MODE; >> + >> + ret = clk_prepare_enable(priv->iclk); >> + if (ret) { >> + dev_err(dev, "Could not prepare or enable the IF clock.\n"); >> + goto err_clk_if_enable; >> + } >> + >> + pm_runtime_set_autosuspend_delay(dev, RCAR_GYROADC_RUNTIME_PM_DELAY_MS); >> + pm_runtime_use_autosuspend(dev); >> + pm_runtime_enable(dev); >> + >> + pm_runtime_get_sync(dev); >> + rcar_gyroadc_hw_init(priv); >> + rcar_gyroadc_hw_start(priv); >> + >> + ret = iio_device_register(indio_dev); >> + if (ret) { >> + dev_err(dev, "Couldn't register IIO device.\n"); >> + goto err_iio_device_register; >> + } >> + >> + pm_runtime_put_sync(dev); >> + >> + return 0; >> + >> +err_iio_device_register: >> + rcar_gyroadc_hw_stop(priv); >> + pm_runtime_put_sync(dev); >> + pm_runtime_disable(dev); >> + pm_runtime_set_suspended(dev); >> + clk_disable_unprepare(priv->iclk); >> +err_clk_if_enable: >> + rcar_gyroadc_deinit_supplies(indio_dev); >> + >> + return ret; >> +} >> + >> +static int rcar_gyroadc_remove(struct platform_device *pdev) >> +{ >> + struct iio_dev *indio_dev = platform_get_drvdata(pdev); >> + struct rcar_gyroadc *priv = iio_priv(indio_dev); >> + struct device *dev = priv->dev; >> + >> + iio_device_unregister(indio_dev); >> + pm_runtime_get_sync(dev); >> + rcar_gyroadc_hw_stop(priv); >> + pm_runtime_put_sync(dev); >> + pm_runtime_disable(dev); >> + pm_runtime_set_suspended(dev); >> + clk_disable_unprepare(priv->iclk); >> + rcar_gyroadc_deinit_supplies(indio_dev); >> + >> + return 0; >> +} >> + >> +#if defined(CONFIG_PM) >> +static int rcar_gyroadc_suspend(struct device *dev) >> +{ >> + struct iio_dev *indio_dev = dev_get_drvdata(dev); >> + struct rcar_gyroadc *priv = iio_priv(indio_dev); >> + >> + rcar_gyroadc_hw_stop(priv); >> + >> + return 0; >> +} >> + >> +static int rcar_gyroadc_resume(struct device *dev) >> +{ >> + struct iio_dev *indio_dev = dev_get_drvdata(dev); >> + struct rcar_gyroadc *priv = iio_priv(indio_dev); >> + >> + rcar_gyroadc_hw_start(priv); >> + >> + return 0; >> +} >> +#endif >> + >> +static const struct dev_pm_ops rcar_gyroadc_pm_ops = { >> + SET_RUNTIME_PM_OPS(rcar_gyroadc_suspend, rcar_gyroadc_resume, NULL) >> +}; >> + >> +static struct platform_driver rcar_gyroadc_driver = { >> + .probe = rcar_gyroadc_probe, >> + .remove = rcar_gyroadc_remove, >> + .driver = { >> + .name = DRIVER_NAME, >> + .of_match_table = rcar_gyroadc_match, >> + .pm = &rcar_gyroadc_pm_ops, >> + }, >> +}; >> + >> +module_platform_driver(rcar_gyroadc_driver); >> + >> +MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); >> +MODULE_DESCRIPTION("Renesas R-Car GyroADC driver"); >> +MODULE_LICENSE("GPL"); >> >
diff --git a/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt b/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt new file mode 100644 index 000000000000..081947367135 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt @@ -0,0 +1,93 @@ +* Renesas RCar GyroADC device driver + +Required properties: +- compatible: Should be "renesas,<chip>-gyroadc", "renesas,rcar-gyroadc". + Use "renesas,r8a7792-gyroadc" for a GyroADC with interrupt + block found in R8A7792. +- reg: Address and length of the register set for the device +- clocks: References to all the clocks specified in the clock-names + property as specified in + Documentation/devicetree/bindings/clock/clock-bindings.txt. +- clock-names: Shall contain "fck" and "if". The "fck" is the GyroADC block + clock, the "if" is the interface clock. +- power-domains: Must contain a reference to the PM domain, if available. +- #address-cells: Should be <1> (setting for the subnodes) for all ADCs + except for "fujitsu,mb88101a". Should be <0> (setting for + only subnode) for "fujitsu,mb88101a". +- #size-cells: Should be <0> (setting for the subnodes) + +Sub-nodes: +Optionally you can define subnodes which select the connected ADC type and +reference voltage for the GyroADC channels. + +Required properties for subnodes: +- compatible: Should be either of: + "fujitsu,mb88101a" + - Fujitsu MB88101A compatible mode, + 12bit sampling, up to 4 channels can be sampled in + round-robin fashion. One Fujitsu chip supplies four + GyroADC channels with data as it contains four ADCs + on the chip and thus for 4-channel operation, single + MB88101A is required. The Cx chipselect lines of the + MB88101A connect directly to two CHS lines of the + GyroADC, no demuxer is required. The data out line + of each MB88101A connects to a shared input pin of + the GyroADC. + "ti,adcs7476" or "ti,adc121" or "adi,ad7476" + - TI ADCS7476 / TI ADC121 / ADI AD7476 compatible mode, + 15bit sampling, up to 8 channels can be sampled in + round-robin fashion. One TI/ADI chip supplies single + ADC channel with data, thus for 8-channel operation, + 8 chips are required. A 3:8 chipselect demuxer is + required to connect the nCS line of the TI/ADI chips + to the GyroADC, while MISO line of each TI/ADI ADC + connects to a shared input pin of the GyroADC. + "maxim,max1162" or "maxim,max11100" + - Maxim MAX1162 / Maxim MAX11100 compatible mode, + 16bit sampling, up to 8 channels can be sampled in + round-robin fashion. One Maxim chip supplies single + ADC channel with data, thus for 8-channel operation, + 8 chips are required. A 3:8 chipselect demuxer is + required to connect the nCS line of the MAX chips + to the GyroADC, while MISO line of each Maxim ADC + connects to a shared input pin of the GyroADC. +- reg: Should be the number of the analog input. Should be present + for all ADCs except "fujitsu,mb88101a". +- vref-supply: Reference to the channel reference voltage regulator. + +Example: + vref_max1162: regulator-vref-max1162 { + compatible = "regulator-fixed"; + + regulator-name = "MAX1162 Vref"; + regulator-min-microvolt = <4096000>; + regulator-max-microvolt = <4096000>; + }; + + &adc { + compatible = "renesas,r8a7791-gyroadc", "renesas,rcar-gyroadc"; + reg = <0 0xe6e54000 0 64>; + clocks = <&mstp9_clks R8A7791_CLK_GYROADC>, <&clk_65m>; + clock-names = "fck", "if"; + power-domains = <&sysc R8A7791_PD_ALWAYS_ON>; + + pinctrl-0 = <&adc_pins>; + pinctrl-names = "default"; + + status = "okay"; + + #address-cells = <1>; + #size-cells = <0>; + + adc@0 { + reg = <0>; + compatible = "maxim,max1162"; + vref-supply = <&vref_max1162>; + }; + + adc@1 { + reg = <1>; + compatible = "maxim,max1162"; + vref-supply = <&vref_max1162>; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 890fc9e3c191..498e8a755eb6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10276,6 +10276,12 @@ L: linux-renesas-soc@vger.kernel.org F: drivers/net/ethernet/renesas/ F: include/linux/sh_eth.h +RENESAS R-CAR GYROADC DRIVER +M: Marek Vasut <marek.vasut@gmail.com> +L: linux-iio@vger.kernel.org +S: Supported +F: drivers/iio/adc/rcar_gyro_adc.c + RENESAS USB2 PHY DRIVER M: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> L: linux-renesas-soc@vger.kernel.org diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 99c051490eff..2fbc11f42740 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -408,6 +408,19 @@ config QCOM_SPMI_VADC To compile this driver as a module, choose M here: the module will be called qcom-spmi-vadc. +config RCAR_GYRO_ADC + tristate "Renesas R-Car GyroADC driver" + depends on ARCH_RCAR_GEN2 || (ARM && COMPILE_TEST) + help + Say yes here to build support for the GyroADC found in Renesas + R-Car Gen2 SoCs. This block is a simple SPI offload engine for + reading data out of attached compatible ADCs in a round-robin + fashion. Up to 4 or 8 ADC channels are supported by this block, + depending on which ADCs are attached. + + To compile this driver as a module, choose M here: the + module will be called rcar-gyroadc. + config ROCKCHIP_SARADC tristate "Rockchip SARADC driver" depends on ARCH_ROCKCHIP || (ARM && COMPILE_TEST) diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 7a40c04c311f..13db7c2bffc8 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_NAU7802) += nau7802.o obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o +obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o obj-$(CONFIG_STX104) += stx104.o obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o diff --git a/drivers/iio/adc/rcar-gyroadc.c b/drivers/iio/adc/rcar-gyroadc.c new file mode 100644 index 000000000000..0c44f72c32a8 --- /dev/null +++ b/drivers/iio/adc/rcar-gyroadc.c @@ -0,0 +1,631 @@ +/* + * Renesas R-Car GyroADC driver + * + * Copyright 2016 Marek Vasut <marek.vasut@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/regulator/consumer.h> +#include <linux/of_platform.h> +#include <linux/err.h> +#include <linux/pm_runtime.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/trigger.h> + +#define DRIVER_NAME "rcar-gyroadc" + +/* GyroADC registers. */ +#define RCAR_GYROADC_MODE_SELECT 0x00 +#define RCAR_GYROADC_MODE_SELECT_1_MB88101A 0x0 +#define RCAR_GYROADC_MODE_SELECT_2_ADCS7476 0x1 +#define RCAR_GYROADC_MODE_SELECT_3_MAX1162 0x3 + +#define RCAR_GYROADC_START_STOP 0x04 +#define RCAR_GYROADC_START_STOP_START BIT(0) + +#define RCAR_GYROADC_CLOCK_LENGTH 0x08 +#define RCAR_GYROADC_1_25MS_LENGTH 0x0c + +#define RCAR_GYROADC_REALTIME_DATA(ch) (0x10 + ((ch) * 4)) +#define RCAR_GYROADC_100MS_ADDED_DATA(ch) (0x30 + ((ch) * 4)) +#define RCAR_GYROADC_10MS_AVG_DATA(ch) (0x50 + ((ch) * 4)) + +#define RCAR_GYROADC_FIFO_STATUS 0x70 +#define RCAR_GYROADC_FIFO_STATUS_EMPTY(ch) BIT(0 + (4 * (ch))) +#define RCAR_GYROADC_FIFO_STATUS_FULL(ch) BIT(1 + (4 * (ch))) +#define RCAR_GYROADC_FIFO_STATUS_ERROR(ch) BIT(2 + (4 * (ch))) + +#define RCAR_GYROADC_INTR 0x74 +#define RCAR_GYROADC_INTR_INT BIT(0) + +#define RCAR_GYROADC_INTENR 0x78 +#define RCAR_GYROADC_INTENR_INTEN BIT(0) + +#define RCAR_GYROADC_SAMPLE_RATE 800 /* Hz */ + +#define RCAR_GYROADC_RUNTIME_PM_DELAY_MS 2000 + +enum rcar_gyroadc_model { + RCAR_GYROADC_MODEL_DEFAULT, + RCAR_GYROADC_MODEL_R8A7792, +}; + +struct rcar_gyroadc { + struct device *dev; + void __iomem *regs; + struct clk *iclk; + struct regulator *vref[8]; + unsigned int num_channels; + enum rcar_gyroadc_model model; + unsigned int mode; + unsigned int sample_width; +}; + +static void rcar_gyroadc_hw_init(struct rcar_gyroadc *priv) +{ + const unsigned long clk_mhz = clk_get_rate(priv->iclk) / 1000000; + const unsigned long clk_mul = + (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) ? 10 : 5; + unsigned long clk_len = clk_mhz * clk_mul; + + /* + * According to the R-Car Gen2 datasheet Rev. 1.01, Sept 08 2014, + * page 77-7, clock length must be even number. If it's odd number, + * add one. + */ + if (clk_len & 1) + clk_len++; + + /* Stop the GyroADC. */ + writel(0, priv->regs + RCAR_GYROADC_START_STOP); + + /* Disable IRQ on V2H. */ + if (priv->model == RCAR_GYROADC_MODEL_R8A7792) + writel(0, priv->regs + RCAR_GYROADC_INTENR); + + /* Set mode and timing. */ + writel(priv->mode, priv->regs + RCAR_GYROADC_MODE_SELECT); + writel(clk_len, priv->regs + RCAR_GYROADC_CLOCK_LENGTH); + writel(clk_mhz * 1250, priv->regs + RCAR_GYROADC_1_25MS_LENGTH); +} + +static void rcar_gyroadc_hw_start(struct rcar_gyroadc *priv) +{ + /* Start sampling. */ + writel(RCAR_GYROADC_START_STOP_START, + priv->regs + RCAR_GYROADC_START_STOP); + + /* + * Wait for the first conversion to complete. This is longer than + * the 1.25 mS in the datasheet because 1.25 mS is not enough for + * the hardware to deliver the first sample and the hardware does + * then return zeroes instead of valid data. + */ + mdelay(3); +} + +static void rcar_gyroadc_hw_stop(struct rcar_gyroadc *priv) +{ + /* Stop the GyroADC. */ + writel(0, priv->regs + RCAR_GYROADC_START_STOP); +} + +#define RCAR_GYROADC_CHAN(_idx) { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = (_idx), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ +} + +static const struct iio_chan_spec rcar_gyroadc_iio_channels_1[] = { + RCAR_GYROADC_CHAN(0), + RCAR_GYROADC_CHAN(1), + RCAR_GYROADC_CHAN(2), + RCAR_GYROADC_CHAN(3), +}; + +static const struct iio_chan_spec rcar_gyroadc_iio_channels_2[] = { + RCAR_GYROADC_CHAN(0), + RCAR_GYROADC_CHAN(1), + RCAR_GYROADC_CHAN(2), + RCAR_GYROADC_CHAN(3), + RCAR_GYROADC_CHAN(4), + RCAR_GYROADC_CHAN(5), + RCAR_GYROADC_CHAN(6), + RCAR_GYROADC_CHAN(7), +}; + +static const struct iio_chan_spec rcar_gyroadc_iio_channels_3[] = { + RCAR_GYROADC_CHAN(0), + RCAR_GYROADC_CHAN(1), + RCAR_GYROADC_CHAN(2), + RCAR_GYROADC_CHAN(3), + RCAR_GYROADC_CHAN(4), + RCAR_GYROADC_CHAN(5), + RCAR_GYROADC_CHAN(6), + RCAR_GYROADC_CHAN(7), +}; + +static int rcar_gyroadc_set_power(struct rcar_gyroadc *priv, bool on) +{ + struct device *dev = priv->dev; + int ret; + + if (on) { + ret = pm_runtime_get_sync(dev); + if (ret < 0) + pm_runtime_put_noidle(dev); + } else { + pm_runtime_mark_last_busy(dev); + ret = pm_runtime_put_autosuspend(dev); + } + + return ret; +} + +static int rcar_gyroadc_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct rcar_gyroadc *priv = iio_priv(indio_dev); + struct regulator *consumer; + unsigned int datareg = RCAR_GYROADC_REALTIME_DATA(chan->channel); + unsigned int vref; + int ret; + + /* + * MB88101 is special in that it has only single regulator for + * all four channels. + */ + if (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) + consumer = priv->vref[0]; + else + consumer = priv->vref[chan->channel]; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (chan->type != IIO_VOLTAGE) + return -EINVAL; + + /* Channel not connected. */ + if (!consumer) + return -EINVAL; + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + ret = rcar_gyroadc_set_power(priv, true); + if (ret < 0) { + iio_device_release_direct_mode(indio_dev); + return ret; + } + + *val = readl(priv->regs + datareg); + *val &= BIT(priv->sample_width) - 1; + + ret = rcar_gyroadc_set_power(priv, false); + iio_device_release_direct_mode(indio_dev); + if (ret < 0) + return ret; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + /* Channel not connected. */ + if (!consumer) + return -EINVAL; + + vref = regulator_get_voltage(consumer); + *val = vref / 1000; + *val2 = 1 << priv->sample_width; + + return IIO_VAL_FRACTIONAL; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = RCAR_GYROADC_SAMPLE_RATE; + + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int rcar_gyroadc_reg_access(struct iio_dev *indio_dev, + unsigned int reg, unsigned int writeval, + unsigned int *readval) +{ + struct rcar_gyroadc *priv = iio_priv(indio_dev); + unsigned int maxreg = RCAR_GYROADC_FIFO_STATUS; + + if (readval == NULL) + return -EINVAL; + + if (reg % 4) + return -EINVAL; + + /* Handle the V2H case with extra interrupt block. */ + if (priv->model == RCAR_GYROADC_MODEL_R8A7792) + maxreg = RCAR_GYROADC_INTENR; + + if (reg > maxreg) + return -EINVAL; + + *readval = readl(priv->regs + reg); + + return 0; +} + +static const struct iio_info rcar_gyroadc_iio_info = { + .driver_module = THIS_MODULE, + .read_raw = rcar_gyroadc_read_raw, + .debugfs_reg_access = rcar_gyroadc_reg_access, +}; + +static const struct of_device_id rcar_gyroadc_match[] = { + { + /* R-Car compatible GyroADC */ + .compatible = "renesas,rcar-gyroadc", + .data = (void *)RCAR_GYROADC_MODEL_DEFAULT, + }, { + /* R-Car V2H specialty with interrupt registers. */ + .compatible = "renesas,r8a7792-gyroadc", + .data = (void *)RCAR_GYROADC_MODEL_R8A7792, + }, { + /* sentinel */ + } +}; + +MODULE_DEVICE_TABLE(of, rcar_gyroadc_match); + +static const struct of_device_id rcar_gyroadc_child_match[] = { + /* Mode 1 ADCs */ + { + .compatible = "fujitsu,mb88101a", + .data = (void *)RCAR_GYROADC_MODE_SELECT_1_MB88101A, + }, + /* Mode 2 ADCs */ + { + .compatible = "ti,adcs7476", + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, + }, { + .compatible = "ti,adc121", + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, + }, { + .compatible = "adi,ad7476", + .data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, + }, + /* Mode 3 ADCs */ + { + .compatible = "maxim,max1162", + .data = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162, + }, { + .compatible = "maxim,max11100", + .data = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162, + }, + { /* sentinel */ } +}; + +static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) +{ + const struct of_device_id *of_id; + const struct iio_chan_spec *channels; + struct rcar_gyroadc *priv = iio_priv(indio_dev); + struct device *dev = priv->dev; + struct device_node *np = dev->of_node; + struct device_node *child; + struct regulator *vref; + unsigned int reg; + unsigned int adcmode, childmode; + unsigned int sample_width; + unsigned int num_channels; + int ret, first = 1; + + for_each_child_of_node(np, child) { + of_id = of_match_node(rcar_gyroadc_child_match, child); + if (!of_id) { + dev_err(dev, "Ignoring unsupported ADC \"%s\".", + child->name); + continue; + } + + childmode = (unsigned int)of_id->data; + switch (childmode) { + case RCAR_GYROADC_MODE_SELECT_1_MB88101A: + sample_width = 12; + channels = rcar_gyroadc_iio_channels_1; + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_1); + break; + case RCAR_GYROADC_MODE_SELECT_2_ADCS7476: + sample_width = 15; + channels = rcar_gyroadc_iio_channels_2; + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_2); + break; + case RCAR_GYROADC_MODE_SELECT_3_MAX1162: + sample_width = 16; + channels = rcar_gyroadc_iio_channels_3; + num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3); + break; + } + + /* + * MB88101 is special in that it's only a single chip taking + * up all the CHS lines. Thus, the DT binding is also special + * and has no reg property. If we run into such ADC, handle + * it here. + */ + if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) { + reg = 0; + } else { + ret = of_property_read_u32(child, "reg", ®); + if (ret) { + dev_err(dev, + "Failed to get child reg property of ADC \"%s\".\n", + child->name); + return ret; + } + + /* Channel number is too high. */ + if (reg >= num_channels) { + dev_err(dev, + "Only %i channels supported with %s, but reg = <%i>.\n", + num_channels, child->name, reg); + return ret; + } + } + + /* Child node selected different mode than the rest. */ + if (!first && (adcmode != childmode)) { + dev_err(dev, + "Channel %i uses different ADC mode than the rest.\n", + reg); + return ret; + } + + /* Channel is valid, grab the regulator. */ + dev->of_node = child; + vref = devm_regulator_get(dev, "vref"); + dev->of_node = np; + if (IS_ERR(vref)) { + dev_dbg(dev, "Channel %i 'vref' supply not connected.\n", + reg); + return PTR_ERR(vref); + } + + priv->vref[reg] = vref; + + if (!first) + continue; + + /* First child node which passed sanity tests. */ + adcmode = childmode; + first = 0; + + priv->num_channels = num_channels; + priv->mode = childmode; + priv->sample_width = sample_width; + + indio_dev->channels = channels; + indio_dev->num_channels = num_channels; + + /* + * MB88101 is special and we only have one such device + * attached to the GyroADC at a time, so if we found it, + * we can stop parsing here. + */ + if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) + break; + } + + if (first) { + dev_err(dev, "No valid ADC channels found, aborting.\n"); + return -EINVAL; + } + + return 0; +} + +static void rcar_gyroadc_deinit_supplies(struct iio_dev *indio_dev) +{ + struct rcar_gyroadc *priv = iio_priv(indio_dev); + unsigned int i; + + for (i = 0; i < priv->num_channels; i++) { + if (!priv->vref[i]) + continue; + + regulator_disable(priv->vref[i]); + } +} + +static int rcar_gyroadc_init_supplies(struct iio_dev *indio_dev) +{ + struct rcar_gyroadc *priv = iio_priv(indio_dev); + struct device *dev = priv->dev; + unsigned int i; + int ret; + + for (i = 0; i < priv->num_channels; i++) { + if (!priv->vref[i]) + continue; + + ret = regulator_enable(priv->vref[i]); + if (ret) { + dev_err(dev, "Failed to enable regulator %i (ret=%i)\n", + i, ret); + goto err; + } + } + + return 0; + +err: + rcar_gyroadc_deinit_supplies(indio_dev); + return ret; +} + +static int rcar_gyroadc_probe(struct platform_device *pdev) +{ + const struct of_device_id *of_id = + of_match_device(rcar_gyroadc_match, &pdev->dev); + struct device *dev = &pdev->dev; + struct rcar_gyroadc *priv; + struct iio_dev *indio_dev; + struct resource *mem; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); + if (!indio_dev) { + dev_err(dev, "Failed to allocate IIO device.\n"); + return -ENOMEM; + } + + priv = iio_priv(indio_dev); + priv->dev = dev; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->regs = devm_ioremap_resource(dev, mem); + if (IS_ERR(priv->regs)) + return PTR_ERR(priv->regs); + + priv->iclk = devm_clk_get(dev, "if"); + if (IS_ERR(priv->iclk)) { + ret = PTR_ERR(priv->iclk); + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get IF clock (ret=%i)\n", ret); + return ret; + } + + ret = rcar_gyroadc_parse_subdevs(indio_dev); + if (ret) + return ret; + + ret = rcar_gyroadc_init_supplies(indio_dev); + if (ret) + return ret; + + priv->model = (enum rcar_gyroadc_model)of_id->data; + + platform_set_drvdata(pdev, indio_dev); + + indio_dev->name = DRIVER_NAME; + indio_dev->dev.parent = dev; + indio_dev->dev.of_node = pdev->dev.of_node; + indio_dev->info = &rcar_gyroadc_iio_info; + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = clk_prepare_enable(priv->iclk); + if (ret) { + dev_err(dev, "Could not prepare or enable the IF clock.\n"); + goto err_clk_if_enable; + } + + pm_runtime_set_autosuspend_delay(dev, RCAR_GYROADC_RUNTIME_PM_DELAY_MS); + pm_runtime_use_autosuspend(dev); + pm_runtime_enable(dev); + + pm_runtime_get_sync(dev); + rcar_gyroadc_hw_init(priv); + rcar_gyroadc_hw_start(priv); + + ret = iio_device_register(indio_dev); + if (ret) { + dev_err(dev, "Couldn't register IIO device.\n"); + goto err_iio_device_register; + } + + pm_runtime_put_sync(dev); + + return 0; + +err_iio_device_register: + rcar_gyroadc_hw_stop(priv); + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); + clk_disable_unprepare(priv->iclk); +err_clk_if_enable: + rcar_gyroadc_deinit_supplies(indio_dev); + + return ret; +} + +static int rcar_gyroadc_remove(struct platform_device *pdev) +{ + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + struct rcar_gyroadc *priv = iio_priv(indio_dev); + struct device *dev = priv->dev; + + iio_device_unregister(indio_dev); + pm_runtime_get_sync(dev); + rcar_gyroadc_hw_stop(priv); + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); + clk_disable_unprepare(priv->iclk); + rcar_gyroadc_deinit_supplies(indio_dev); + + return 0; +} + +#if defined(CONFIG_PM) +static int rcar_gyroadc_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct rcar_gyroadc *priv = iio_priv(indio_dev); + + rcar_gyroadc_hw_stop(priv); + + return 0; +} + +static int rcar_gyroadc_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct rcar_gyroadc *priv = iio_priv(indio_dev); + + rcar_gyroadc_hw_start(priv); + + return 0; +} +#endif + +static const struct dev_pm_ops rcar_gyroadc_pm_ops = { + SET_RUNTIME_PM_OPS(rcar_gyroadc_suspend, rcar_gyroadc_resume, NULL) +}; + +static struct platform_driver rcar_gyroadc_driver = { + .probe = rcar_gyroadc_probe, + .remove = rcar_gyroadc_remove, + .driver = { + .name = DRIVER_NAME, + .of_match_table = rcar_gyroadc_match, + .pm = &rcar_gyroadc_pm_ops, + }, +}; + +module_platform_driver(rcar_gyroadc_driver); + +MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); +MODULE_DESCRIPTION("Renesas R-Car GyroADC driver"); +MODULE_LICENSE("GPL");
Add IIO driver for the Renesas RCar GyroADC block. This block is a simple 4/8-channel ADC which samples 12/15/24 bits of data every cycle from all channels. Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Cc: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Simon Horman <horms+renesas@verge.net.au> Cc: Jonathan Cameron <jic23@kernel.org> Cc: linux-renesas-soc@vger.kernel.org --- V2: - Spelling fixes - Rename the driver source file to rcar-gyroadc - Rework the channel sample width handling - Use iio_device_claim_mode_direct() - Rename "renesas,rcar-gyroadc" to "renesas,r8a7791-gyroadc" and rename "renesas,rcar-gyroadc-r8a7792" to "renesas,r8a7792-gyroadc" to match the new naming scheme (WARNING: scif uses the old one!) - Switch to using regulators for channel voltage reference, add new properties renesas,gyroadc-vref-chN-supply for N in 0..7 - Handle vref regulators as optional to, make channels without vref regulator return EINVAL on read. - Fix module license to GPL - Drop interrupt.h include - Rename clk to iclk - Rename RCar to R-Car - Rework the invalid mode handling - Don't print error message on EPROBE_DEFER - Drop fclk handling, use runtime PM for that instead V3: - More R-Car spelling fixes - Flip checks for V2H, since that's the only one that has interrupt registers - Replace if-else statement with switch statement in init_mode - Use unsigned types where applicable - Rework timing calculation slightly to drop if-else block - Use DIV_ROUND_CLOSEST V4: - Add renesas,rcar-gyroadc fallback compatible string into the bindings - Rework the ADC bindings to use per-channel subdevs - Support more compatible ADC chips V5: - Reword the DT bindings, improve the description of the modes - Improve the description in Kconfig - Implement special DT bindings for the MB88101A 4-channel ADC and add special handling for this chip into the driver. - Add missing ADC stop on failure, wrap it into a function - Fail hard in case the DT properties are incorrect or missing - Fix reporting of scale, so that channel * scale value is in mV - Use fractional scale instead of int plus nano - Use pm_runtime to disable the sampling 2 seconds after last used V6: - Replace the indio_dev->name with "rcar-gyroadc" instead of OF node name --- .../bindings/iio/adc/renesas,gyroadc.txt | 93 +++ MAINTAINERS | 6 + drivers/iio/adc/Kconfig | 13 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/rcar-gyroadc.c | 631 +++++++++++++++++++++ 5 files changed, 744 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/renesas,gyroadc.txt create mode 100644 drivers/iio/adc/rcar-gyroadc.c