[v2,2/2] phy: rockchip-inno-usb2: add a new driver for Rockchip usb2phy

Commit Message

Frank Wang June 2, 2016, 6:48 a.m. UTC

The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
than rk3288 and before, and most of phy-related registers are also
different from the past, so a new phy driver is required necessarily.

Signed-off-by: Frank Wang <[e-mail]>
---

Changes in v2:
 - Changed vbus_host operation from gpio to regulator in *_probe.
 - Improved the fault treatment relate to 480m clock register.
 - Cleaned up some meaningless codes in *_clk480m_disable.
 - made more clear the comment of *_sm_work.

 drivers/phy/Kconfig                  |    7 +
 drivers/phy/Makefile                 |    1 +
 drivers/phy/phy-rockchip-inno-usb2.c |  604 ++++++++++++++++++++++++++++++++++
 3 files changed, 612 insertions(+)
 create mode 100644 drivers/phy/phy-rockchip-inno-usb2.c

Comments

Guenter Roeck June 3, 2016, 7:57 p.m. UTC | #1

On Thu, Jun 02, 2016 at 02:48:10PM +0800, Frank Wang wrote:
> The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
> than rk3288 and before, and most of phy-related registers are also
> different from the past, so a new phy driver is required necessarily.
> 
> Signed-off-by: Frank Wang <[e-mail]>
> ---
> 
> Changes in v2:
>  - Changed vbus_host operation from gpio to regulator in *_probe.
>  - Improved the fault treatment relate to 480m clock register.
>  - Cleaned up some meaningless codes in *_clk480m_disable.
>  - made more clear the comment of *_sm_work.
> 
>  drivers/phy/Kconfig                  |    7 +
>  drivers/phy/Makefile                 |    1 +
>  drivers/phy/phy-rockchip-inno-usb2.c |  604 ++++++++++++++++++++++++++++++++++
>  3 files changed, 612 insertions(+)
>  create mode 100644 drivers/phy/phy-rockchip-inno-usb2.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index b869b98..29ef15c 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -347,6 +347,13 @@ config PHY_ROCKCHIP_USB
>  	help
>  	  Enable this to support the Rockchip USB 2.0 PHY.
>  
> +config PHY_ROCKCHIP_INNO_USB2
> +	tristate "Rockchip INNO USB2PHY Driver"
> +	depends on ARCH_ROCKCHIP && OF
> +	select GENERIC_PHY
> +	help
> +	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.
> +
>  config PHY_ROCKCHIP_EMMC
>  	tristate "Rockchip EMMC PHY Driver"
>  	depends on ARCH_ROCKCHIP && OF
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 9c3e73c..4963fbc 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -38,6 +38,7 @@ phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+= phy-s5pv210-usb2.o
>  obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o
>  obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)	+= phy-qcom-apq8064-sata.o
>  obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
> +obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2)	+= phy-rockchip-inno-usb2.o
>  obj-$(CONFIG_PHY_ROCKCHIP_EMMC) += phy-rockchip-emmc.o
>  obj-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
>  obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
> diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
> new file mode 100644
> index 0000000..eca46ff
> --- /dev/null
> +++ b/drivers/phy/phy-rockchip-inno-usb2.c
> @@ -0,0 +1,604 @@
> +/*
> + * Rockchip USB2.0 PHY with Innosilicon IP block driver
> + *
> + * Copyright (C) 2016 Fuzhou Rockchip Electronics Co., Ltd
> + *
> + * 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.
> + *
> + * 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/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +#define BIT_WRITEABLE_SHIFT	16
> +#define SCHEDULE_DELAY	(60 * HZ)
> +
> +enum rockchip_usb2phy_port_id {
> +	USB2PHY_PORT_OTG,
> +	USB2PHY_PORT_HOST,
> +	USB2PHY_NUM_PORTS,
> +};
> +
> +enum rockchip_usb2phy_host_state {
> +	PHY_STATE_HS_ONLINE	= 0,
> +	PHY_STATE_DISCONNECT	= 1,
> +	PHY_STATE_HS_CONNECT	= 2,
> +	PHY_STATE_FS_CONNECT	= 4,
> +};
> +
> +struct usb2phy_reg {
> +	unsigned int	offset;
> +	unsigned int	bitend;
> +	unsigned int	bitstart;
> +	unsigned int	disable;
> +	unsigned int	enable;
> +};
> +
> +/**
> + * struct rockchip_usb2phy_port_cfg: usb-phy port configuration.
> + * @phy_sus: phy suspend register.
> + * @ls_det_en: linestate detection enable register.
> + * @ls_det_st: linestate detection state register.
> + * @ls_det_clr: linestate detection clear register.
> + * @utmi_ls: utmi linestate state register.
> + * @utmi_hstdet: utmi host disconnect register.
> + */
> +struct rockchip_usb2phy_port_cfg {
> +	struct usb2phy_reg	phy_sus;
> +	struct usb2phy_reg	ls_det_en;
> +	struct usb2phy_reg	ls_det_st;
> +	struct usb2phy_reg	ls_det_clr;
> +	struct usb2phy_reg	utmi_ls;
> +	struct usb2phy_reg	utmi_hstdet;
> +};
> +
> +/**
> + * struct rockchip_usb2phy_cfg: usb-phy configuration.
> + * @num_ports: specify how many ports that the phy has.
> + * @clkout_ctl: keep on/turn off output clk of phy.
> + */
> +struct rockchip_usb2phy_cfg {
> +	unsigned int	num_ports;
> +	struct usb2phy_reg	clkout_ctl;
> +	const struct rockchip_usb2phy_port_cfg	*port_cfgs;
> +};
> +
> +/**
> + * struct rockchip_usb2phy_port: usb-phy port data.
> + * @port_id: flag for otg port or host port.
> + * @suspended: phy suspended flag.
> + * @ls_irq: IRQ number assigned for linestate detection.
> + * @mutex: for register updating in sm_work.
> + * @sm_work: OTG state machine work.
> + * @phy_cfg: port register configuration, assigned by driver data.
> + */
> +struct rockchip_usb2phy_port {
> +	struct phy	*phy;
> +	unsigned int	port_id;
> +	bool		suspended;
> +	int		ls_irq;
> +	struct mutex	mutex;
> +	struct		delayed_work sm_work;
> +	const struct	rockchip_usb2phy_port_cfg *port_cfg;
> +};
> +
> +/**
> + * struct rockchip_usb2phy: usb2.0 phy driver data.
> + * @grf: General Register Files regmap.
> + * @clk480m: clock struct of phy output clk.
> + * @clk_hw: clock struct of phy output clk management.
> + * @vbus_host: the regulator for vbus_host supply.
> + * @phy_cfg: phy register configuration, assigned by driver data.
> + * @ports: phy port instance.
> + */
> +struct rockchip_usb2phy {
> +	struct device	*dev;
> +	struct regmap	*grf;
> +	struct clk	*clk480m;
> +	struct clk_hw	clk480m_hw;
> +	struct regulator	*vbus_host;
> +	const struct rockchip_usb2phy_cfg	*phy_cfg;
> +	struct rockchip_usb2phy_port	ports[USB2PHY_NUM_PORTS];
> +};
> +
> +static inline int property_enable(struct rockchip_usb2phy *rphy,
> +				  const struct usb2phy_reg *reg, bool en)
> +{
> +	unsigned int val, mask, tmp;
> +
> +	tmp = en ? reg->enable : reg->disable;
> +	mask = GENMASK(reg->bitend, reg->bitstart);
> +	val = (tmp << reg->bitstart) | (mask << BIT_WRITEABLE_SHIFT);
> +
> +	return regmap_write(rphy->grf, reg->offset, val);
> +}
> +
> +static inline bool property_enabled(struct rockchip_usb2phy *rphy,
> +				    const struct usb2phy_reg *reg)
> +{
> +	int ret;
> +	unsigned int tmp, orig;
> +	unsigned int mask = GENMASK(reg->bitend, reg->bitstart);
> +
> +	ret = regmap_read(rphy->grf, reg->offset, &orig);
> +	if (ret)
> +		return false;
> +
> +	tmp = (orig & mask) >> reg->bitstart;
> +	return tmp == reg->enable;
> +}
> +
> +static int rockchip_usb2phy_clk480m_enable(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +	int ret = 0;
> +
> +	/* turn on 480m clk output if it is off */
> +	if (!property_enabled(rphy, &rphy->phy_cfg->clkout_ctl)) {
> +		ret = property_enable(rphy, &rphy->phy_cfg->clkout_ctl, true);
> +		if (ret)
> +			return ret;
> +
> +		/* waitting for the clk become stable */
> +		mdelay(1);
> +	}
> +
> +	return ret;
> +}
> +
> +static void rockchip_usb2phy_clk480m_disable(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +
> +	/* turn off 480m clk output */
> +	property_enable(rphy, &rphy->phy_cfg->clkout_ctl, false);
> +}
> +
> +static int rockchip_usb2phy_clk480m_enabled(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +
> +	return property_enabled(rphy, &rphy->phy_cfg->clkout_ctl);
> +}
> +
> +static unsigned long
> +rockchip_usb2phy_clk480m_recalc_rate(struct clk_hw *hw,
> +				     unsigned long parent_rate)
> +{
> +	return 480000000;
> +}
> +
> +static const struct clk_ops rockchip_usb2phy_clkout_ops = {
> +	.enable = rockchip_usb2phy_clk480m_enable,
> +	.disable = rockchip_usb2phy_clk480m_disable,
> +	.is_enabled = rockchip_usb2phy_clk480m_enabled,
> +	.recalc_rate = rockchip_usb2phy_clk480m_recalc_rate,
> +};
> +
> +static void rockchip_usb2phy_clk480m_unregister(void *data)
> +{
> +	struct rockchip_usb2phy *rphy = data;
> +
> +	of_clk_del_provider(rphy->dev->of_node);
> +	clk_unregister(rphy->clk480m);
> +}
> +
> +static struct clk *
> +rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
> +{
> +	struct device_node *node = rphy->dev->of_node;
> +	struct clk *clk;
> +	struct clk_init_data init;
> +	int ret;
> +
> +	init.name = "clk_usbphy_480m";
> +	init.ops = &rockchip_usb2phy_clkout_ops;
> +	init.flags = CLK_IS_ROOT;
> +	init.parent_names = NULL;
> +	init.num_parents = 0;
> +	rphy->clk480m_hw.init = &init;
> +
> +	/* optional override of the clockname */
> +	of_property_read_string(node, "clock-output-names", &init.name);
> +
> +	/* register the clock */
> +	clk = clk_register(rphy->dev, &rphy->clk480m_hw);
> +	if (IS_ERR(clk))
> +		return clk;
> +
> +	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
> +	if (ret < 0)
> +		goto err_clk_provider;
> +
> +	ret = devm_add_action(rphy->dev, rockchip_usb2phy_clk480m_unregister,
> +			      rphy);
> +	if (ret < 0)
> +		goto err_unreg_action;
> +
> +	return clk;
> +
> +err_unreg_action:
> +	of_clk_del_provider(node);
> +err_clk_provider:
> +	clk_unregister(clk);
> +	return ERR_PTR(ret);
> +}
> +
> +static int rockchip_usb2phy_init(struct phy *phy)
> +{
> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
> +	int ret = 0;
> +
> +	if (rport->port_id == USB2PHY_PORT_HOST) {
> +		/* clear linestate and enable linestate detect irq */
> +		mutex_lock(&rport->mutex);
> +
> +		ret = property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
> +		if (ret) {
> +			mutex_unlock(&rport->mutex);
> +			return ret;
> +		}
> +
> +		ret = property_enable(rphy, &rport->port_cfg->ls_det_en, true);
> +		if (ret) {
> +			mutex_unlock(&rport->mutex);
> +			return ret;
> +		}
> +
> +		mutex_unlock(&rport->mutex);
> +		schedule_delayed_work(&rport->sm_work, SCHEDULE_DELAY);
> +	}
> +
> +	return ret;
> +}
> +
> +static int rockchip_usb2phy_resume(struct phy *phy)
> +{
> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
> +	int ret;
> +
> +	dev_dbg(&rport->phy->dev, "port resume\n");
> +
> +	ret = clk_prepare_enable(rphy->clk480m);
> +	if (ret)
> +		return ret;
> +
> +	ret = property_enable(rphy, &rport->port_cfg->phy_sus, false);
> +	if (ret)
> +		return ret;
> +
> +	rport->suspended = false;
> +	return 0;
> +}
> +
> +static int rockchip_usb2phy_suspend(struct phy *phy)
> +{
> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
> +	int ret;
> +
> +	dev_dbg(&rport->phy->dev, "port suspend\n");
> +
> +	ret = property_enable(rphy, &rport->port_cfg->phy_sus, true);
> +	if (ret)
> +		return ret;
> +
> +	rport->suspended = true;
> +	clk_disable_unprepare(rphy->clk480m);
> +	return 0;
> +}
> +
> +static int rockchip_usb2phy_exit(struct phy *phy)
> +{
> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> +
> +	if (rport->port_id == USB2PHY_PORT_HOST)
> +		cancel_delayed_work_sync(&rport->sm_work);
> +
> +	return 0;
> +}
> +
> +static const struct phy_ops rockchip_usb2phy_ops = {
> +	.init		= rockchip_usb2phy_init,
> +	.exit		= rockchip_usb2phy_exit,
> +	.power_on	= rockchip_usb2phy_resume,
> +	.power_off	= rockchip_usb2phy_suspend,
> +	.owner		= THIS_MODULE,
> +};
> +
> +/*
> + * The function manage host-phy port state and suspend/resume phy port
> + * to save power.
> + *
> + * we rely on utmi_linestate and utmi_hostdisconnect to identify whether
> + * FS/HS is disconnect or not. Besides, we do not need care it is FS
> + * disconnected or HS disconnected, actually, we just only need get the
> + * device is disconnected at last through rearm the delayed work,
> + * to suspend the phy port in _PHY_STATE_DISCONNECT_ case.
> + *
> + * NOTE: It may invoke *phy_suspend or *phy_resume which will invoke some
> + * clk related APIs, so do not invoke it from interrupt context directly.
> + */
> +static void rockchip_usb2phy_sm_work(struct work_struct *work)
> +{
> +	struct rockchip_usb2phy_port *rport =
> +		container_of(work, struct rockchip_usb2phy_port, sm_work.work);
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
> +	unsigned int sh = rport->port_cfg->utmi_hstdet.bitend -
> +			  rport->port_cfg->utmi_hstdet.bitstart + 1;
> +	unsigned int ul, uhd, state;
> +	unsigned int ul_mask, uhd_mask;
> +	int ret;
> +
> +	mutex_lock(&rport->mutex);
> +
> +	ret = regmap_read(rphy->grf, rport->port_cfg->utmi_ls.offset, &ul);
> +	if (ret < 0)
> +		goto next_schedule;
> +
> +	ret = regmap_read(rphy->grf, rport->port_cfg->utmi_hstdet.offset,
> +			  &uhd);
> +	if (ret < 0)
> +		goto next_schedule;
> +
> +	uhd_mask = GENMASK(rport->port_cfg->utmi_hstdet.bitend,
> +			   rport->port_cfg->utmi_hstdet.bitstart);
> +	ul_mask = GENMASK(rport->port_cfg->utmi_ls.bitend,
> +			  rport->port_cfg->utmi_ls.bitstart);
> +
> +	/* stitch on utmi_ls and utmi_hstdet as phy state */
> +	state = ((uhd & uhd_mask) >> rport->port_cfg->utmi_hstdet.bitstart) |
> +		(((ul & ul_mask) >> rport->port_cfg->utmi_ls.bitstart) << sh);
> +
> +	switch (state) {
> +	case PHY_STATE_HS_ONLINE:
> +		dev_dbg(&rport->phy->dev, "HS online\n");
> +		break;
> +	case PHY_STATE_FS_CONNECT:
> +		/*
> +		 * For FS device, the online state share with connect state
> +		 * from utmi_ls and utmi_hstdet register, so we distinguish
> +		 * them via suspended flag.
> +		 */
> +		if (!rport->suspended) {
> +			dev_dbg(&rport->phy->dev, "FS online\n");
> +			break;
> +		}
> +		/* fall through */
> +	case PHY_STATE_HS_CONNECT:
> +		if (rport->suspended) {
> +			dev_dbg(&rport->phy->dev, "HS/FS connected\n");
> +			rockchip_usb2phy_resume(rport->phy);
> +			rport->suspended = false;
> +		}
> +		break;
> +	case PHY_STATE_DISCONNECT:
> +		if (!rport->suspended) {
> +			dev_dbg(&rport->phy->dev, "HS/FS disconnected\n");
> +			rockchip_usb2phy_suspend(rport->phy);
> +			rport->suspended = true;
> +		}
> +
> +		/*
> +		 * activate the linestate detection to get the next device
> +		 * plug-in irq.
> +		 */
> +		property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
> +		property_enable(rphy, &rport->port_cfg->ls_det_en, true);
> +
> +		/*
> +		 * we don't need to rearm the delayed work when the phy port
> +		 * is suspended.
> +		 */
> +		mutex_unlock(&rport->mutex);
> +		return;
> +	default:
> +		dev_dbg(&rport->phy->dev, "unknown phy state\n");
> +		break;
> +	}
> +
> +next_schedule:
> +	mutex_unlock(&rport->mutex);
> +	schedule_delayed_work(&rport->sm_work, SCHEDULE_DELAY);
> +}
> +
> +static irqreturn_t rockchip_usb2phy_linestate_irq(int irq, void *data)
> +{
> +	struct rockchip_usb2phy_port *rport = data;
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
> +
> +	if (!property_enabled(rphy, &rport->port_cfg->ls_det_st))
> +		return IRQ_NONE;
> +
> +	mutex_lock(&rport->mutex);
> +
> +	/* disable linestate detect irq and clear its status */
> +	property_enable(rphy, &rport->port_cfg->ls_det_en, false);
> +	property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
> +
> +	mutex_unlock(&rport->mutex);
> +
> +	/*
> +	 * In this case for host phy port, a new device is plugged in,
> +	 * meanwhile, if the phy port is suspended, we need rearm the work to
> +	 * resume it and mange its states; otherwise, we do nothing about that.
> +	 */
> +	if (rport->suspended && rport->port_id == USB2PHY_PORT_HOST)
> +		rockchip_usb2phy_sm_work(&rport->sm_work.work);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int rockchip_usb2phy_host_port_init(struct rockchip_usb2phy *rphy,
> +					   struct rockchip_usb2phy_port *rport,
> +					   struct device_node *child_np)
> +{
> +	int ret = 0;
> +
> +	rport->port_id = USB2PHY_PORT_HOST;
> +	mutex_init(&rport->mutex);
> +	INIT_DELAYED_WORK(&rport->sm_work, rockchip_usb2phy_sm_work);
> +
> +	rport->ls_irq = of_irq_get_byname(child_np, "linestate");
> +	if (rport->ls_irq < 0) {
> +		dev_err(rphy->dev, "no linestate irq provided\n");
> +		return rport->ls_irq;
> +	}
> +
> +	ret = devm_request_threaded_irq(rphy->dev, rport->ls_irq, NULL,
> +					rockchip_usb2phy_linestate_irq,
> +					IRQF_ONESHOT,
> +					"rockchip_usb2phy", rport);
> +	if (ret) {
> +		dev_err(rphy->dev, "failed to request irq handle\n");
> +		return ret;
> +	}
> +
> +	return ret;
> +}
> +
> +static int rockchip_usb2phy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct device_node *child_np;
> +	struct phy_provider *provider;
> +	struct rockchip_usb2phy *rphy;
> +	const struct of_device_id *match;
> +	int index, ret;
> +
> +	rphy = devm_kzalloc(dev, sizeof(*rphy), GFP_KERNEL);
> +	if (!rphy)
> +		return -ENOMEM;
> +
> +	match = of_match_device(dev->driver->of_match_table, dev);
> +	if (!match || !match->data) {
> +		dev_err(dev, "phy configs are not assigned!\n");
> +		return -EINVAL;
> +	}
> +
> +	if (!dev->parent || !dev->parent->of_node)
> +		return -ENOMEM;
> +
> +	rphy->grf = syscon_node_to_regmap(dev->parent->of_node);
> +	if (IS_ERR(rphy->grf))
> +		return PTR_ERR(rphy->grf);
> +
> +	rphy->dev = dev;
> +	rphy->phy_cfg = match->data;
> +	platform_set_drvdata(pdev, rphy);
> +
> +	rphy->clk480m = rockchip_usb2phy_clk480m_register(rphy);
> +	if (IS_ERR(rphy->clk480m))
> +		return PTR_ERR(rphy->clk480m);
> +
> +	rphy->vbus_host = devm_regulator_get_optional(dev, "vbus_host");
> +	if (IS_ERR(rphy->vbus_host)) {
> +		ret = PTR_ERR(rphy->vbus_host);
> +		if (ret == -EPROBE_DEFER)
> +			return ret;
> +
> +		dev_info(dev, "vbus_host regulator is not assigned!\n");
> +		rphy->vbus_host = NULL;
> +	} else {
> +		ret = regulator_enable(rphy->vbus_host);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	index = 0;
> +	for_each_child_of_node(np, child_np) {
> +		struct rockchip_usb2phy_port *rport = &rphy->ports[index];
> +		struct phy *phy;
> +
> +		phy = devm_phy_create(dev, child_np, &rockchip_usb2phy_ops);
> +		if (IS_ERR(phy)) {
> +			dev_err(dev, "failed to create phy\n");
> +			ret = PTR_ERR(phy);
> +			goto put_child;
> +		}
> +
> +		rport->phy = phy;
> +		rport->port_cfg = &rphy->phy_cfg->port_cfgs[index];
> +
> +		/* initialize otg/host port separately */
> +		if (!of_node_cmp(child_np->name, "host-port")) {
> +			ret = rockchip_usb2phy_host_port_init(rphy, rport,
> +							      child_np);
> +			if (ret)
> +				goto put_child;
> +		}
> +
> +		phy_set_drvdata(rport->phy, rport);
> +		index++;

I am concerned about the use of 'index', and how it maps to port_cfgs[]
and ports[]. If I take the example from the devicetree documentations,
the host port would get index==1 amd map to rphy->phy_cfg->port_cfgs[1],
which is empty in rk3366_phy_cfgs. If someone specifies dummy devicetree
sub-nodes, it would be easy to create references to port_cfgs[2] as well
as ports[2] or even higher, and the results would be unpredictable.

How about something like the following ?

		if !of_node_cmp(child_np->name, "host-port")) {
			rport->port_cfg =
				&rphy->phy_cfg->port_cfgs[USB2PHY_PORT_HOST];
			ret = rockchip_usb2phy_host_port_init(...);
			...
		}

		phy_set_drvdata(rport->phy, rport);
		if (++index >= rphy->phy_cfg->num_ports)
			break;

> +	}
> +
> +	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +	return PTR_ERR_OR_ZERO(provider);
> +
> +put_child:
> +	of_node_put(child_np);
> +	return ret;
> +}
> +
> +static const struct rockchip_usb2phy_cfg rk3366_phy_cfgs = {
> +	.num_ports	= 1,
> +	.clkout_ctl	= { 0x0724, 15, 15, 1, 0 },
> +	.port_cfgs	= (struct rockchip_usb2phy_port_cfg[]) {
> +		{
> +			.phy_sus	= { 0x0728, 15, 0, 0, 0x1d1 },
> +			.ls_det_en	= { 0x0680, 4, 4, 0, 1 },
> +			.ls_det_st	= { 0x0690, 4, 4, 0, 1 },
> +			.ls_det_clr	= { 0x06a0, 4, 4, 0, 1 },
> +			.utmi_ls	= { 0x049c, 14, 13, 0, 1 },
> +			.utmi_hstdet	= { 0x049c, 12, 12, 0, 1 }

Assuming this is the host port entry, I am wondering if it would be better
to explicitly specify the index.

struct rockchip_usb2phy_cfg {
        unsigned int num_ports;
	struct usb2phy_reg clkout_ctl;
	struct rockchip_usb2phy_port_cfg port_cfgs[USB2PHY_NUM_PORTS];
};

...

static const struct rockchip_usb2phy_cfg rk3366_phy_cfgs = {
	.num_ports      = 1,
	.clkout_ctl     = { 0x0724, 15, 15, 1, 0 },
	.port_cfgs      = {
		[USB2PHY_PORT_HOST] = {
			.phy_sus        = { 0x0728, 15, 0, 0, 0x1d1 },
			.ls_det_en      = { 0x0680, 4, 4, 0, 1 },
			.ls_det_st      = { 0x0690, 4, 4, 0, 1 },
			.ls_det_clr     = { 0x06a0, 4, 4, 0, 1 },
			.utmi_ls        = { 0x049c, 14, 13, 0, 1 },
			.utmi_hstdet    = { 0x049c, 12, 12, 0, 1 }
		}

> +	},
> +};
> +
> +static const struct of_device_id rockchip_usb2phy_dt_match[] = {
> +	{ .compatible = "rockchip,rk3366-usb2phy", .data = &rk3366_phy_cfgs },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, rockchip_usb2phy_dt_match);
> +
> +static struct platform_driver rockchip_usb2phy_driver = {
> +	.probe		= rockchip_usb2phy_probe,
> +	.driver		= {
> +		.name	= "rockchip-usb2phy",
> +		.of_match_table = rockchip_usb2phy_dt_match,
> +	},
> +};
> +module_platform_driver(rockchip_usb2phy_driver);
> +
> +MODULE_AUTHOR("Frank Wang <[e-mail]>");
> +MODULE_DESCRIPTION("Rockchip USB2.0 PHY driver");
> +MODULE_LICENSE("GPL v2");

Guenter Roeck June 3, 2016, 7:59 p.m. UTC | #2

On Thu, Jun 02, 2016 at 02:48:10PM +0800, Frank Wang wrote:
> The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
> than rk3288 and before, and most of phy-related registers are also
> different from the past, so a new phy driver is required necessarily.
> 
> Signed-off-by: Frank Wang <[e-mail]>
> ---
> 
> Changes in v2:
>  - Changed vbus_host operation from gpio to regulator in *_probe.
>  - Improved the fault treatment relate to 480m clock register.
>  - Cleaned up some meaningless codes in *_clk480m_disable.
>  - made more clear the comment of *_sm_work.
> 
>  drivers/phy/Kconfig                  |    7 +
>  drivers/phy/Makefile                 |    1 +
>  drivers/phy/phy-rockchip-inno-usb2.c |  604 ++++++++++++++++++++++++++++++++++
>  3 files changed, 612 insertions(+)
>  create mode 100644 drivers/phy/phy-rockchip-inno-usb2.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index b869b98..29ef15c 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -347,6 +347,13 @@ config PHY_ROCKCHIP_USB
>  	help
>  	  Enable this to support the Rockchip USB 2.0 PHY.
>  
> +config PHY_ROCKCHIP_INNO_USB2
> +	tristate "Rockchip INNO USB2PHY Driver"
> +	depends on ARCH_ROCKCHIP && OF
> +	select GENERIC_PHY
> +	help
> +	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.
> +
>  config PHY_ROCKCHIP_EMMC
>  	tristate "Rockchip EMMC PHY Driver"
>  	depends on ARCH_ROCKCHIP && OF
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 9c3e73c..4963fbc 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -38,6 +38,7 @@ phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+= phy-s5pv210-usb2.o
>  obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o
>  obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)	+= phy-qcom-apq8064-sata.o
>  obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
> +obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2)	+= phy-rockchip-inno-usb2.o
>  obj-$(CONFIG_PHY_ROCKCHIP_EMMC) += phy-rockchip-emmc.o
>  obj-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
>  obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
> diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
> new file mode 100644
> index 0000000..eca46ff
> --- /dev/null
> +++ b/drivers/phy/phy-rockchip-inno-usb2.c
> @@ -0,0 +1,604 @@
> +/*
> + * Rockchip USB2.0 PHY with Innosilicon IP block driver
> + *
> + * Copyright (C) 2016 Fuzhou Rockchip Electronics Co., Ltd
> + *
> + * 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.
> + *
> + * 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/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +#define BIT_WRITEABLE_SHIFT	16
> +#define SCHEDULE_DELAY	(60 * HZ)
> +
> +enum rockchip_usb2phy_port_id {
> +	USB2PHY_PORT_OTG,
> +	USB2PHY_PORT_HOST,
> +	USB2PHY_NUM_PORTS,
> +};
> +
> +enum rockchip_usb2phy_host_state {
> +	PHY_STATE_HS_ONLINE	= 0,
> +	PHY_STATE_DISCONNECT	= 1,
> +	PHY_STATE_HS_CONNECT	= 2,
> +	PHY_STATE_FS_CONNECT	= 4,
> +};
> +
> +struct usb2phy_reg {
> +	unsigned int	offset;
> +	unsigned int	bitend;
> +	unsigned int	bitstart;
> +	unsigned int	disable;
> +	unsigned int	enable;
> +};
> +
> +/**
> + * struct rockchip_usb2phy_port_cfg: usb-phy port configuration.
> + * @phy_sus: phy suspend register.
> + * @ls_det_en: linestate detection enable register.
> + * @ls_det_st: linestate detection state register.
> + * @ls_det_clr: linestate detection clear register.
> + * @utmi_ls: utmi linestate state register.
> + * @utmi_hstdet: utmi host disconnect register.
> + */
> +struct rockchip_usb2phy_port_cfg {
> +	struct usb2phy_reg	phy_sus;
> +	struct usb2phy_reg	ls_det_en;
> +	struct usb2phy_reg	ls_det_st;
> +	struct usb2phy_reg	ls_det_clr;
> +	struct usb2phy_reg	utmi_ls;
> +	struct usb2phy_reg	utmi_hstdet;
> +};
> +
> +/**
> + * struct rockchip_usb2phy_cfg: usb-phy configuration.
> + * @num_ports: specify how many ports that the phy has.
> + * @clkout_ctl: keep on/turn off output clk of phy.
> + */
> +struct rockchip_usb2phy_cfg {
> +	unsigned int	num_ports;
> +	struct usb2phy_reg	clkout_ctl;
> +	const struct rockchip_usb2phy_port_cfg	*port_cfgs;
> +};
> +
> +/**
> + * struct rockchip_usb2phy_port: usb-phy port data.
> + * @port_id: flag for otg port or host port.
> + * @suspended: phy suspended flag.
> + * @ls_irq: IRQ number assigned for linestate detection.
> + * @mutex: for register updating in sm_work.
> + * @sm_work: OTG state machine work.
> + * @phy_cfg: port register configuration, assigned by driver data.
> + */
> +struct rockchip_usb2phy_port {
> +	struct phy	*phy;
> +	unsigned int	port_id;
> +	bool		suspended;
> +	int		ls_irq;
> +	struct mutex	mutex;
> +	struct		delayed_work sm_work;
> +	const struct	rockchip_usb2phy_port_cfg *port_cfg;
> +};
> +
> +/**
> + * struct rockchip_usb2phy: usb2.0 phy driver data.
> + * @grf: General Register Files regmap.
> + * @clk480m: clock struct of phy output clk.
> + * @clk_hw: clock struct of phy output clk management.
> + * @vbus_host: the regulator for vbus_host supply.
> + * @phy_cfg: phy register configuration, assigned by driver data.
> + * @ports: phy port instance.
> + */
> +struct rockchip_usb2phy {
> +	struct device	*dev;
> +	struct regmap	*grf;
> +	struct clk	*clk480m;
> +	struct clk_hw	clk480m_hw;
> +	struct regulator	*vbus_host;
> +	const struct rockchip_usb2phy_cfg	*phy_cfg;
> +	struct rockchip_usb2phy_port	ports[USB2PHY_NUM_PORTS];
> +};
> +
> +static inline int property_enable(struct rockchip_usb2phy *rphy,
> +				  const struct usb2phy_reg *reg, bool en)
> +{
> +	unsigned int val, mask, tmp;
> +
> +	tmp = en ? reg->enable : reg->disable;
> +	mask = GENMASK(reg->bitend, reg->bitstart);
> +	val = (tmp << reg->bitstart) | (mask << BIT_WRITEABLE_SHIFT);
> +
> +	return regmap_write(rphy->grf, reg->offset, val);
> +}
> +
> +static inline bool property_enabled(struct rockchip_usb2phy *rphy,
> +				    const struct usb2phy_reg *reg)
> +{
> +	int ret;
> +	unsigned int tmp, orig;
> +	unsigned int mask = GENMASK(reg->bitend, reg->bitstart);
> +
> +	ret = regmap_read(rphy->grf, reg->offset, &orig);
> +	if (ret)
> +		return false;
> +
> +	tmp = (orig & mask) >> reg->bitstart;
> +	return tmp == reg->enable;
> +}
> +
> +static int rockchip_usb2phy_clk480m_enable(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +	int ret = 0;
> +
> +	/* turn on 480m clk output if it is off */
> +	if (!property_enabled(rphy, &rphy->phy_cfg->clkout_ctl)) {
> +		ret = property_enable(rphy, &rphy->phy_cfg->clkout_ctl, true);
> +		if (ret)
> +			return ret;
> +
> +		/* waitting for the clk become stable */
> +		mdelay(1);
> +	}
> +
> +	return ret;
> +}
> +
> +static void rockchip_usb2phy_clk480m_disable(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +
> +	/* turn off 480m clk output */
> +	property_enable(rphy, &rphy->phy_cfg->clkout_ctl, false);
> +}
> +
> +static int rockchip_usb2phy_clk480m_enabled(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +
> +	return property_enabled(rphy, &rphy->phy_cfg->clkout_ctl);
> +}
> +
> +static unsigned long
> +rockchip_usb2phy_clk480m_recalc_rate(struct clk_hw *hw,
> +				     unsigned long parent_rate)
> +{
> +	return 480000000;
> +}
> +
> +static const struct clk_ops rockchip_usb2phy_clkout_ops = {
> +	.enable = rockchip_usb2phy_clk480m_enable,
> +	.disable = rockchip_usb2phy_clk480m_disable,
> +	.is_enabled = rockchip_usb2phy_clk480m_enabled,
> +	.recalc_rate = rockchip_usb2phy_clk480m_recalc_rate,
> +};
> +
> +static void rockchip_usb2phy_clk480m_unregister(void *data)
> +{
> +	struct rockchip_usb2phy *rphy = data;
> +
> +	of_clk_del_provider(rphy->dev->of_node);
> +	clk_unregister(rphy->clk480m);
> +}
> +
> +static struct clk *
> +rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
> +{
> +	struct device_node *node = rphy->dev->of_node;
> +	struct clk *clk;
> +	struct clk_init_data init;
> +	int ret;
> +
> +	init.name = "clk_usbphy_480m";
> +	init.ops = &rockchip_usb2phy_clkout_ops;
> +	init.flags = CLK_IS_ROOT;

One more comment:

include/linux/clk-provider.h:#define CLK_IS_ROOT                BIT(4) /* Deprecated: Don't use */

... and the definition has been removed in linux-next.

Guenter

Heiko Stübner June 3, 2016, 9:24 p.m. UTC | #3

Am Freitag, 3. Juni 2016, 12:59:22 schrieb Guenter Roeck:
> On Thu, Jun 02, 2016 at 02:48:10PM +0800, Frank Wang wrote:
> > The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
> > than rk3288 and before, and most of phy-related registers are also
> > different from the past, so a new phy driver is required necessarily.
> > 
> > Signed-off-by: Frank Wang <[e-mail]>
> > ---
> > 
> > Changes in v2:
> >  - Changed vbus_host operation from gpio to regulator in *_probe.
> >  - Improved the fault treatment relate to 480m clock register.
> >  - Cleaned up some meaningless codes in *_clk480m_disable.
> >  - made more clear the comment of *_sm_work.
> >  
> >  drivers/phy/Kconfig                  |    7 +
> >  drivers/phy/Makefile                 |    1 +
> >  drivers/phy/phy-rockchip-inno-usb2.c |  604
> >  ++++++++++++++++++++++++++++++++++ 3 files changed, 612 insertions(+)
> >  create mode 100644 drivers/phy/phy-rockchip-inno-usb2.c
> > 
> > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> > index b869b98..29ef15c 100644
> > --- a/drivers/phy/Kconfig
> > +++ b/drivers/phy/Kconfig
> > @@ -347,6 +347,13 @@ config PHY_ROCKCHIP_USB
> > 
> >  	help
> >  	
> >  	  Enable this to support the Rockchip USB 2.0 PHY.
> > 
> > +config PHY_ROCKCHIP_INNO_USB2
> > +	tristate "Rockchip INNO USB2PHY Driver"
> > +	depends on ARCH_ROCKCHIP && OF
> > +	select GENERIC_PHY
> > +	help
> > +	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.
> > +
> > 
> >  config PHY_ROCKCHIP_EMMC
> >  
> >  	tristate "Rockchip EMMC PHY Driver"
> >  	depends on ARCH_ROCKCHIP && OF
> > 
> > diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> > index 9c3e73c..4963fbc 100644
> > --- a/drivers/phy/Makefile
> > +++ b/drivers/phy/Makefile
> > @@ -38,6 +38,7 @@ phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+=
> > phy-s5pv210-usb2.o> 
> >  obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o
> >  obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)	+= phy-qcom-apq8064-sata.o
> >  obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
> > 
> > +obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2)	+= phy-rockchip-inno-usb2.o
> > 
> >  obj-$(CONFIG_PHY_ROCKCHIP_EMMC) += phy-rockchip-emmc.o
> >  obj-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
> >  obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
> > 
> > diff --git a/drivers/phy/phy-rockchip-inno-usb2.c
> > b/drivers/phy/phy-rockchip-inno-usb2.c new file mode 100644
> > index 0000000..eca46ff
> > --- /dev/null
> > +++ b/drivers/phy/phy-rockchip-inno-usb2.c
> > @@ -0,0 +1,604 @@
> > +/*
> > + * Rockchip USB2.0 PHY with Innosilicon IP block driver
> > + *
> > + * Copyright (C) 2016 Fuzhou Rockchip Electronics Co., Ltd
> > + *
> > + * 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.
> > + *
> > + * 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/clk.h>
> > +#include <linux/clk-provider.h>
> > +#include <linux/delay.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/io.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/jiffies.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/of.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_irq.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/mfd/syscon.h>
> > +
> > +#define BIT_WRITEABLE_SHIFT	16
> > +#define SCHEDULE_DELAY	(60 * HZ)
> > +
> > +enum rockchip_usb2phy_port_id {
> > +	USB2PHY_PORT_OTG,
> > +	USB2PHY_PORT_HOST,
> > +	USB2PHY_NUM_PORTS,
> > +};
> > +
> > +enum rockchip_usb2phy_host_state {
> > +	PHY_STATE_HS_ONLINE	= 0,
> > +	PHY_STATE_DISCONNECT	= 1,
> > +	PHY_STATE_HS_CONNECT	= 2,
> > +	PHY_STATE_FS_CONNECT	= 4,
> > +};
> > +
> > +struct usb2phy_reg {
> > +	unsigned int	offset;
> > +	unsigned int	bitend;
> > +	unsigned int	bitstart;
> > +	unsigned int	disable;
> > +	unsigned int	enable;
> > +};
> > +
> > +/**
> > + * struct rockchip_usb2phy_port_cfg: usb-phy port configuration.
> > + * @phy_sus: phy suspend register.
> > + * @ls_det_en: linestate detection enable register.
> > + * @ls_det_st: linestate detection state register.
> > + * @ls_det_clr: linestate detection clear register.
> > + * @utmi_ls: utmi linestate state register.
> > + * @utmi_hstdet: utmi host disconnect register.
> > + */
> > +struct rockchip_usb2phy_port_cfg {
> > +	struct usb2phy_reg	phy_sus;
> > +	struct usb2phy_reg	ls_det_en;
> > +	struct usb2phy_reg	ls_det_st;
> > +	struct usb2phy_reg	ls_det_clr;
> > +	struct usb2phy_reg	utmi_ls;
> > +	struct usb2phy_reg	utmi_hstdet;
> > +};
> > +
> > +/**
> > + * struct rockchip_usb2phy_cfg: usb-phy configuration.
> > + * @num_ports: specify how many ports that the phy has.
> > + * @clkout_ctl: keep on/turn off output clk of phy.
> > + */
> > +struct rockchip_usb2phy_cfg {
> > +	unsigned int	num_ports;
> > +	struct usb2phy_reg	clkout_ctl;
> > +	const struct rockchip_usb2phy_port_cfg	*port_cfgs;
> > +};
> > +
> > +/**
> > + * struct rockchip_usb2phy_port: usb-phy port data.
> > + * @port_id: flag for otg port or host port.
> > + * @suspended: phy suspended flag.
> > + * @ls_irq: IRQ number assigned for linestate detection.
> > + * @mutex: for register updating in sm_work.
> > + * @sm_work: OTG state machine work.
> > + * @phy_cfg: port register configuration, assigned by driver data.
> > + */
> > +struct rockchip_usb2phy_port {
> > +	struct phy	*phy;
> > +	unsigned int	port_id;
> > +	bool		suspended;
> > +	int		ls_irq;
> > +	struct mutex	mutex;
> > +	struct		delayed_work sm_work;
> > +	const struct	rockchip_usb2phy_port_cfg *port_cfg;
> > +};
> > +
> > +/**
> > + * struct rockchip_usb2phy: usb2.0 phy driver data.
> > + * @grf: General Register Files regmap.
> > + * @clk480m: clock struct of phy output clk.
> > + * @clk_hw: clock struct of phy output clk management.
> > + * @vbus_host: the regulator for vbus_host supply.
> > + * @phy_cfg: phy register configuration, assigned by driver data.
> > + * @ports: phy port instance.
> > + */
> > +struct rockchip_usb2phy {
> > +	struct device	*dev;
> > +	struct regmap	*grf;
> > +	struct clk	*clk480m;
> > +	struct clk_hw	clk480m_hw;
> > +	struct regulator	*vbus_host;
> > +	const struct rockchip_usb2phy_cfg	*phy_cfg;
> > +	struct rockchip_usb2phy_port	ports[USB2PHY_NUM_PORTS];
> > +};
> > +
> > +static inline int property_enable(struct rockchip_usb2phy *rphy,
> > +				  const struct usb2phy_reg *reg, bool en)
> > +{
> > +	unsigned int val, mask, tmp;
> > +
> > +	tmp = en ? reg->enable : reg->disable;
> > +	mask = GENMASK(reg->bitend, reg->bitstart);
> > +	val = (tmp << reg->bitstart) | (mask << BIT_WRITEABLE_SHIFT);
> > +
> > +	return regmap_write(rphy->grf, reg->offset, val);
> > +}
> > +
> > +static inline bool property_enabled(struct rockchip_usb2phy *rphy,
> > +				    const struct usb2phy_reg *reg)
> > +{
> > +	int ret;
> > +	unsigned int tmp, orig;
> > +	unsigned int mask = GENMASK(reg->bitend, reg->bitstart);
> > +
> > +	ret = regmap_read(rphy->grf, reg->offset, &orig);
> > +	if (ret)
> > +		return false;
> > +
> > +	tmp = (orig & mask) >> reg->bitstart;
> > +	return tmp == reg->enable;
> > +}
> > +
> > +static int rockchip_usb2phy_clk480m_enable(struct clk_hw *hw)
> > +{
> > +	struct rockchip_usb2phy *rphy =
> > +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> > +	int ret = 0;
> > +
> > +	/* turn on 480m clk output if it is off */
> > +	if (!property_enabled(rphy, &rphy->phy_cfg->clkout_ctl)) {
> > +		ret = property_enable(rphy, &rphy->phy_cfg->clkout_ctl, true);
> > +		if (ret)
> > +			return ret;
> > +
> > +		/* waitting for the clk become stable */
> > +		mdelay(1);
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static void rockchip_usb2phy_clk480m_disable(struct clk_hw *hw)
> > +{
> > +	struct rockchip_usb2phy *rphy =
> > +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> > +
> > +	/* turn off 480m clk output */
> > +	property_enable(rphy, &rphy->phy_cfg->clkout_ctl, false);
> > +}
> > +
> > +static int rockchip_usb2phy_clk480m_enabled(struct clk_hw *hw)
> > +{
> > +	struct rockchip_usb2phy *rphy =
> > +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> > +
> > +	return property_enabled(rphy, &rphy->phy_cfg->clkout_ctl);
> > +}
> > +
> > +static unsigned long
> > +rockchip_usb2phy_clk480m_recalc_rate(struct clk_hw *hw,
> > +				     unsigned long parent_rate)
> > +{
> > +	return 480000000;
> > +}
> > +
> > +static const struct clk_ops rockchip_usb2phy_clkout_ops = {
> > +	.enable = rockchip_usb2phy_clk480m_enable,
> > +	.disable = rockchip_usb2phy_clk480m_disable,
> > +	.is_enabled = rockchip_usb2phy_clk480m_enabled,
> > +	.recalc_rate = rockchip_usb2phy_clk480m_recalc_rate,
> > +};
> > +
> > +static void rockchip_usb2phy_clk480m_unregister(void *data)
> > +{
> > +	struct rockchip_usb2phy *rphy = data;
> > +
> > +	of_clk_del_provider(rphy->dev->of_node);
> > +	clk_unregister(rphy->clk480m);
> > +}
> > +
> > +static struct clk *
> > +rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
> > +{
> > +	struct device_node *node = rphy->dev->of_node;
> > +	struct clk *clk;
> > +	struct clk_init_data init;
> > +	int ret;
> > +
> > +	init.name = "clk_usbphy_480m";
> > +	init.ops = &rockchip_usb2phy_clkout_ops;
> > +	init.flags = CLK_IS_ROOT;
> 
> One more comment:
> 
> include/linux/clk-provider.h:#define CLK_IS_ROOT                BIT(4) /*
> Deprecated: Don't use */
> 
> ... and the definition has been removed in linux-next.

also, the created clock should be a child of the phy-supply clock. Please take 
a look at the picophy-variant (phy-rockchip-usb) that already handles that 
parent assignment.


Heiko

Frank Wang June 6, 2016, 4:45 a.m. UTC | #4

Hi Guenter,

On 2016/6/4 3:57, Guenter Roeck wrote:
> On Thu, Jun 02, 2016 at 02:48:10PM +0800, Frank Wang wrote:
>> The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
>> than rk3288 and before, and most of phy-related registers are also
>> different from the past, so a new phy driver is required necessarily.
>>
>> Signed-off-by: Frank Wang <[e-mail]>
>> ---
>>
>> Changes in v2:
>>   - Changed vbus_host operation from gpio to regulator in *_probe.
>>   - Improved the fault treatment relate to 480m clock register.
>>   - Cleaned up some meaningless codes in *_clk480m_disable.
>>   - made more clear the comment of *_sm_work.
>>
>>   drivers/phy/Kconfig                  |    7 +
>>   drivers/phy/Makefile                 |    1 +
>>   drivers/phy/phy-rockchip-inno-usb2.c |  604 ++++++++++++++++++++++++++++++++++
>>   3 files changed, 612 insertions(+)
>>   create mode 100644 drivers/phy/phy-rockchip-inno-usb2.c
>>
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index b869b98..29ef15c 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -347,6 +347,13 @@ config PHY_ROCKCHIP_USB
>>   	help
>>   	  Enable this to support the Rockchip USB 2.0 PHY.
>>
>> +config PHY_ROCKCHIP_INNO_USB2
>> +	tristate "Rockchip INNO USB2PHY Driver"
>> +	depends on ARCH_ROCKCHIP && OF
>> +	select GENERIC_PHY
>> +	help
>> +	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.
>> +
>>   config PHY_ROCKCHIP_EMMC
>>   	tristate "Rockchip EMMC PHY Driver"
>>   	depends on ARCH_ROCKCHIP && OF
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index 9c3e73c..4963fbc 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -38,6 +38,7 @@ phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+= phy-s5pv210-usb2.o
>>   obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o
>>   obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)	+= phy-qcom-apq8064-sata.o
>>   obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
>> +obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2)	+= phy-rockchip-inno-usb2.o
>>   obj-$(CONFIG_PHY_ROCKCHIP_EMMC) += phy-rockchip-emmc.o
>>   obj-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
>>   obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
>> diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
>> new file mode 100644
>> index 0000000..eca46ff
>> --- /dev/null
>> +++ b/drivers/phy/phy-rockchip-inno-usb2.c
>> @@ -0,0 +1,604 @@
>> +/*
>> + * Rockchip USB2.0 PHY with Innosilicon IP block driver
>> + *
>> + * Copyright (C) 2016 Fuzhou Rockchip Electronics Co., Ltd
>> + *
>> + * 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.
>> + *
>> + * 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/clk.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/delay.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/jiffies.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/mutex.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +#include <linux/mfd/syscon.h>
>> +
>> +#define BIT_WRITEABLE_SHIFT	16
>> +#define SCHEDULE_DELAY	(60 * HZ)
>> +
>> +enum rockchip_usb2phy_port_id {
>> +	USB2PHY_PORT_OTG,
>> +	USB2PHY_PORT_HOST,
>> +	USB2PHY_NUM_PORTS,
>> +};
>> +
>> +enum rockchip_usb2phy_host_state {
>> +	PHY_STATE_HS_ONLINE	= 0,
>> +	PHY_STATE_DISCONNECT	= 1,
>> +	PHY_STATE_HS_CONNECT	= 2,
>> +	PHY_STATE_FS_CONNECT	= 4,
>> +};
>> +
>> +struct usb2phy_reg {
>> +	unsigned int	offset;
>> +	unsigned int	bitend;
>> +	unsigned int	bitstart;
>> +	unsigned int	disable;
>> +	unsigned int	enable;
>> +};
>> +
>> +/**
>> + * struct rockchip_usb2phy_port_cfg: usb-phy port configuration.
>> + * @phy_sus: phy suspend register.
>> + * @ls_det_en: linestate detection enable register.
>> + * @ls_det_st: linestate detection state register.
>> + * @ls_det_clr: linestate detection clear register.
>> + * @utmi_ls: utmi linestate state register.
>> + * @utmi_hstdet: utmi host disconnect register.
>> + */
>> +struct rockchip_usb2phy_port_cfg {
>> +	struct usb2phy_reg	phy_sus;
>> +	struct usb2phy_reg	ls_det_en;
>> +	struct usb2phy_reg	ls_det_st;
>> +	struct usb2phy_reg	ls_det_clr;
>> +	struct usb2phy_reg	utmi_ls;
>> +	struct usb2phy_reg	utmi_hstdet;
>> +};
>> +
>> +/**
>> + * struct rockchip_usb2phy_cfg: usb-phy configuration.
>> + * @num_ports: specify how many ports that the phy has.
>> + * @clkout_ctl: keep on/turn off output clk of phy.
>> + */
>> +struct rockchip_usb2phy_cfg {
>> +	unsigned int	num_ports;
>> +	struct usb2phy_reg	clkout_ctl;
>> +	const struct rockchip_usb2phy_port_cfg	*port_cfgs;
>> +};
>> +
>> +/**
>> + * struct rockchip_usb2phy_port: usb-phy port data.
>> + * @port_id: flag for otg port or host port.
>> + * @suspended: phy suspended flag.
>> + * @ls_irq: IRQ number assigned for linestate detection.
>> + * @mutex: for register updating in sm_work.
>> + * @sm_work: OTG state machine work.
>> + * @phy_cfg: port register configuration, assigned by driver data.
>> + */
>> +struct rockchip_usb2phy_port {
>> +	struct phy	*phy;
>> +	unsigned int	port_id;
>> +	bool		suspended;
>> +	int		ls_irq;
>> +	struct mutex	mutex;
>> +	struct		delayed_work sm_work;
>> +	const struct	rockchip_usb2phy_port_cfg *port_cfg;
>> +};
>> +
>> +/**
>> + * struct rockchip_usb2phy: usb2.0 phy driver data.
>> + * @grf: General Register Files regmap.
>> + * @clk480m: clock struct of phy output clk.
>> + * @clk_hw: clock struct of phy output clk management.
>> + * @vbus_host: the regulator for vbus_host supply.
>> + * @phy_cfg: phy register configuration, assigned by driver data.
>> + * @ports: phy port instance.
>> + */
>> +struct rockchip_usb2phy {
>> +	struct device	*dev;
>> +	struct regmap	*grf;
>> +	struct clk	*clk480m;
>> +	struct clk_hw	clk480m_hw;
>> +	struct regulator	*vbus_host;
>> +	const struct rockchip_usb2phy_cfg	*phy_cfg;
>> +	struct rockchip_usb2phy_port	ports[USB2PHY_NUM_PORTS];
>> +};
>> +
>> +static inline int property_enable(struct rockchip_usb2phy *rphy,
>> +				  const struct usb2phy_reg *reg, bool en)
>> +{
>> +	unsigned int val, mask, tmp;
>> +
>> +	tmp = en ? reg->enable : reg->disable;
>> +	mask = GENMASK(reg->bitend, reg->bitstart);
>> +	val = (tmp << reg->bitstart) | (mask << BIT_WRITEABLE_SHIFT);
>> +
>> +	return regmap_write(rphy->grf, reg->offset, val);
>> +}
>> +
>> +static inline bool property_enabled(struct rockchip_usb2phy *rphy,
>> +				    const struct usb2phy_reg *reg)
>> +{
>> +	int ret;
>> +	unsigned int tmp, orig;
>> +	unsigned int mask = GENMASK(reg->bitend, reg->bitstart);
>> +
>> +	ret = regmap_read(rphy->grf, reg->offset, &orig);
>> +	if (ret)
>> +		return false;
>> +
>> +	tmp = (orig & mask) >> reg->bitstart;
>> +	return tmp == reg->enable;
>> +}
>> +
>> +static int rockchip_usb2phy_clk480m_enable(struct clk_hw *hw)
>> +{
>> +	struct rockchip_usb2phy *rphy =
>> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
>> +	int ret = 0;
>> +
>> +	/* turn on 480m clk output if it is off */
>> +	if (!property_enabled(rphy, &rphy->phy_cfg->clkout_ctl)) {
>> +		ret = property_enable(rphy, &rphy->phy_cfg->clkout_ctl, true);
>> +		if (ret)
>> +			return ret;
>> +
>> +		/* waitting for the clk become stable */
>> +		mdelay(1);
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static void rockchip_usb2phy_clk480m_disable(struct clk_hw *hw)
>> +{
>> +	struct rockchip_usb2phy *rphy =
>> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
>> +
>> +	/* turn off 480m clk output */
>> +	property_enable(rphy, &rphy->phy_cfg->clkout_ctl, false);
>> +}
>> +
>> +static int rockchip_usb2phy_clk480m_enabled(struct clk_hw *hw)
>> +{
>> +	struct rockchip_usb2phy *rphy =
>> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
>> +
>> +	return property_enabled(rphy, &rphy->phy_cfg->clkout_ctl);
>> +}
>> +
>> +static unsigned long
>> +rockchip_usb2phy_clk480m_recalc_rate(struct clk_hw *hw,
>> +				     unsigned long parent_rate)
>> +{
>> +	return 480000000;
>> +}
>> +
>> +static const struct clk_ops rockchip_usb2phy_clkout_ops = {
>> +	.enable = rockchip_usb2phy_clk480m_enable,
>> +	.disable = rockchip_usb2phy_clk480m_disable,
>> +	.is_enabled = rockchip_usb2phy_clk480m_enabled,
>> +	.recalc_rate = rockchip_usb2phy_clk480m_recalc_rate,
>> +};
>> +
>> +static void rockchip_usb2phy_clk480m_unregister(void *data)
>> +{
>> +	struct rockchip_usb2phy *rphy = data;
>> +
>> +	of_clk_del_provider(rphy->dev->of_node);
>> +	clk_unregister(rphy->clk480m);
>> +}
>> +
>> +static struct clk *
>> +rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
>> +{
>> +	struct device_node *node = rphy->dev->of_node;
>> +	struct clk *clk;
>> +	struct clk_init_data init;
>> +	int ret;
>> +
>> +	init.name = "clk_usbphy_480m";
>> +	init.ops = &rockchip_usb2phy_clkout_ops;
>> +	init.flags = CLK_IS_ROOT;
>> +	init.parent_names = NULL;
>> +	init.num_parents = 0;
>> +	rphy->clk480m_hw.init = &init;
>> +
>> +	/* optional override of the clockname */
>> +	of_property_read_string(node, "clock-output-names", &init.name);
>> +
>> +	/* register the clock */
>> +	clk = clk_register(rphy->dev, &rphy->clk480m_hw);
>> +	if (IS_ERR(clk))
>> +		return clk;
>> +
>> +	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
>> +	if (ret < 0)
>> +		goto err_clk_provider;
>> +
>> +	ret = devm_add_action(rphy->dev, rockchip_usb2phy_clk480m_unregister,
>> +			      rphy);
>> +	if (ret < 0)
>> +		goto err_unreg_action;
>> +
>> +	return clk;
>> +
>> +err_unreg_action:
>> +	of_clk_del_provider(node);
>> +err_clk_provider:
>> +	clk_unregister(clk);
>> +	return ERR_PTR(ret);
>> +}
>> +
>> +static int rockchip_usb2phy_init(struct phy *phy)
>> +{
>> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
>> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
>> +	int ret = 0;
>> +
>> +	if (rport->port_id == USB2PHY_PORT_HOST) {
>> +		/* clear linestate and enable linestate detect irq */
>> +		mutex_lock(&rport->mutex);
>> +
>> +		ret = property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
>> +		if (ret) {
>> +			mutex_unlock(&rport->mutex);
>> +			return ret;
>> +		}
>> +
>> +		ret = property_enable(rphy, &rport->port_cfg->ls_det_en, true);
>> +		if (ret) {
>> +			mutex_unlock(&rport->mutex);
>> +			return ret;
>> +		}
>> +
>> +		mutex_unlock(&rport->mutex);
>> +		schedule_delayed_work(&rport->sm_work, SCHEDULE_DELAY);
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static int rockchip_usb2phy_resume(struct phy *phy)
>> +{
>> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
>> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
>> +	int ret;
>> +
>> +	dev_dbg(&rport->phy->dev, "port resume\n");
>> +
>> +	ret = clk_prepare_enable(rphy->clk480m);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = property_enable(rphy, &rport->port_cfg->phy_sus, false);
>> +	if (ret)
>> +		return ret;
>> +
>> +	rport->suspended = false;
>> +	return 0;
>> +}
>> +
>> +static int rockchip_usb2phy_suspend(struct phy *phy)
>> +{
>> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
>> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
>> +	int ret;
>> +
>> +	dev_dbg(&rport->phy->dev, "port suspend\n");
>> +
>> +	ret = property_enable(rphy, &rport->port_cfg->phy_sus, true);
>> +	if (ret)
>> +		return ret;
>> +
>> +	rport->suspended = true;
>> +	clk_disable_unprepare(rphy->clk480m);
>> +	return 0;
>> +}
>> +
>> +static int rockchip_usb2phy_exit(struct phy *phy)
>> +{
>> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
>> +
>> +	if (rport->port_id == USB2PHY_PORT_HOST)
>> +		cancel_delayed_work_sync(&rport->sm_work);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct phy_ops rockchip_usb2phy_ops = {
>> +	.init		= rockchip_usb2phy_init,
>> +	.exit		= rockchip_usb2phy_exit,
>> +	.power_on	= rockchip_usb2phy_resume,
>> +	.power_off	= rockchip_usb2phy_suspend,
>> +	.owner		= THIS_MODULE,
>> +};
>> +
>> +/*
>> + * The function manage host-phy port state and suspend/resume phy port
>> + * to save power.
>> + *
>> + * we rely on utmi_linestate and utmi_hostdisconnect to identify whether
>> + * FS/HS is disconnect or not. Besides, we do not need care it is FS
>> + * disconnected or HS disconnected, actually, we just only need get the
>> + * device is disconnected at last through rearm the delayed work,
>> + * to suspend the phy port in _PHY_STATE_DISCONNECT_ case.
>> + *
>> + * NOTE: It may invoke *phy_suspend or *phy_resume which will invoke some
>> + * clk related APIs, so do not invoke it from interrupt context directly.
>> + */
>> +static void rockchip_usb2phy_sm_work(struct work_struct *work)
>> +{
>> +	struct rockchip_usb2phy_port *rport =
>> +		container_of(work, struct rockchip_usb2phy_port, sm_work.work);
>> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
>> +	unsigned int sh = rport->port_cfg->utmi_hstdet.bitend -
>> +			  rport->port_cfg->utmi_hstdet.bitstart + 1;
>> +	unsigned int ul, uhd, state;
>> +	unsigned int ul_mask, uhd_mask;
>> +	int ret;
>> +
>> +	mutex_lock(&rport->mutex);
>> +
>> +	ret = regmap_read(rphy->grf, rport->port_cfg->utmi_ls.offset, &ul);
>> +	if (ret < 0)
>> +		goto next_schedule;
>> +
>> +	ret = regmap_read(rphy->grf, rport->port_cfg->utmi_hstdet.offset,
>> +			  &uhd);
>> +	if (ret < 0)
>> +		goto next_schedule;
>> +
>> +	uhd_mask = GENMASK(rport->port_cfg->utmi_hstdet.bitend,
>> +			   rport->port_cfg->utmi_hstdet.bitstart);
>> +	ul_mask = GENMASK(rport->port_cfg->utmi_ls.bitend,
>> +			  rport->port_cfg->utmi_ls.bitstart);
>> +
>> +	/* stitch on utmi_ls and utmi_hstdet as phy state */
>> +	state = ((uhd & uhd_mask) >> rport->port_cfg->utmi_hstdet.bitstart) |
>> +		(((ul & ul_mask) >> rport->port_cfg->utmi_ls.bitstart) << sh);
>> +
>> +	switch (state) {
>> +	case PHY_STATE_HS_ONLINE:
>> +		dev_dbg(&rport->phy->dev, "HS online\n");
>> +		break;
>> +	case PHY_STATE_FS_CONNECT:
>> +		/*
>> +		 * For FS device, the online state share with connect state
>> +		 * from utmi_ls and utmi_hstdet register, so we distinguish
>> +		 * them via suspended flag.
>> +		 */
>> +		if (!rport->suspended) {
>> +			dev_dbg(&rport->phy->dev, "FS online\n");
>> +			break;
>> +		}
>> +		/* fall through */
>> +	case PHY_STATE_HS_CONNECT:
>> +		if (rport->suspended) {
>> +			dev_dbg(&rport->phy->dev, "HS/FS connected\n");
>> +			rockchip_usb2phy_resume(rport->phy);
>> +			rport->suspended = false;
>> +		}
>> +		break;
>> +	case PHY_STATE_DISCONNECT:
>> +		if (!rport->suspended) {
>> +			dev_dbg(&rport->phy->dev, "HS/FS disconnected\n");
>> +			rockchip_usb2phy_suspend(rport->phy);
>> +			rport->suspended = true;
>> +		}
>> +
>> +		/*
>> +		 * activate the linestate detection to get the next device
>> +		 * plug-in irq.
>> +		 */
>> +		property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
>> +		property_enable(rphy, &rport->port_cfg->ls_det_en, true);
>> +
>> +		/*
>> +		 * we don't need to rearm the delayed work when the phy port
>> +		 * is suspended.
>> +		 */
>> +		mutex_unlock(&rport->mutex);
>> +		return;
>> +	default:
>> +		dev_dbg(&rport->phy->dev, "unknown phy state\n");
>> +		break;
>> +	}
>> +
>> +next_schedule:
>> +	mutex_unlock(&rport->mutex);
>> +	schedule_delayed_work(&rport->sm_work, SCHEDULE_DELAY);
>> +}
>> +
>> +static irqreturn_t rockchip_usb2phy_linestate_irq(int irq, void *data)
>> +{
>> +	struct rockchip_usb2phy_port *rport = data;
>> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
>> +
>> +	if (!property_enabled(rphy, &rport->port_cfg->ls_det_st))
>> +		return IRQ_NONE;
>> +
>> +	mutex_lock(&rport->mutex);
>> +
>> +	/* disable linestate detect irq and clear its status */
>> +	property_enable(rphy, &rport->port_cfg->ls_det_en, false);
>> +	property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
>> +
>> +	mutex_unlock(&rport->mutex);
>> +
>> +	/*
>> +	 * In this case for host phy port, a new device is plugged in,
>> +	 * meanwhile, if the phy port is suspended, we need rearm the work to
>> +	 * resume it and mange its states; otherwise, we do nothing about that.
>> +	 */
>> +	if (rport->suspended && rport->port_id == USB2PHY_PORT_HOST)
>> +		rockchip_usb2phy_sm_work(&rport->sm_work.work);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int rockchip_usb2phy_host_port_init(struct rockchip_usb2phy *rphy,
>> +					   struct rockchip_usb2phy_port *rport,
>> +					   struct device_node *child_np)
>> +{
>> +	int ret = 0;
>> +
>> +	rport->port_id = USB2PHY_PORT_HOST;
>> +	mutex_init(&rport->mutex);
>> +	INIT_DELAYED_WORK(&rport->sm_work, rockchip_usb2phy_sm_work);
>> +
>> +	rport->ls_irq = of_irq_get_byname(child_np, "linestate");
>> +	if (rport->ls_irq < 0) {
>> +		dev_err(rphy->dev, "no linestate irq provided\n");
>> +		return rport->ls_irq;
>> +	}
>> +
>> +	ret = devm_request_threaded_irq(rphy->dev, rport->ls_irq, NULL,
>> +					rockchip_usb2phy_linestate_irq,
>> +					IRQF_ONESHOT,
>> +					"rockchip_usb2phy", rport);
>> +	if (ret) {
>> +		dev_err(rphy->dev, "failed to request irq handle\n");
>> +		return ret;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static int rockchip_usb2phy_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct device_node *np = dev->of_node;
>> +	struct device_node *child_np;
>> +	struct phy_provider *provider;
>> +	struct rockchip_usb2phy *rphy;
>> +	const struct of_device_id *match;
>> +	int index, ret;
>> +
>> +	rphy = devm_kzalloc(dev, sizeof(*rphy), GFP_KERNEL);
>> +	if (!rphy)
>> +		return -ENOMEM;
>> +
>> +	match = of_match_device(dev->driver->of_match_table, dev);
>> +	if (!match || !match->data) {
>> +		dev_err(dev, "phy configs are not assigned!\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	if (!dev->parent || !dev->parent->of_node)
>> +		return -ENOMEM;
>> +
>> +	rphy->grf = syscon_node_to_regmap(dev->parent->of_node);
>> +	if (IS_ERR(rphy->grf))
>> +		return PTR_ERR(rphy->grf);
>> +
>> +	rphy->dev = dev;
>> +	rphy->phy_cfg = match->data;
>> +	platform_set_drvdata(pdev, rphy);
>> +
>> +	rphy->clk480m = rockchip_usb2phy_clk480m_register(rphy);
>> +	if (IS_ERR(rphy->clk480m))
>> +		return PTR_ERR(rphy->clk480m);
>> +
>> +	rphy->vbus_host = devm_regulator_get_optional(dev, "vbus_host");
>> +	if (IS_ERR(rphy->vbus_host)) {
>> +		ret = PTR_ERR(rphy->vbus_host);
>> +		if (ret == -EPROBE_DEFER)
>> +			return ret;
>> +
>> +		dev_info(dev, "vbus_host regulator is not assigned!\n");
>> +		rphy->vbus_host = NULL;
>> +	} else {
>> +		ret = regulator_enable(rphy->vbus_host);
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	index = 0;
>> +	for_each_child_of_node(np, child_np) {
>> +		struct rockchip_usb2phy_port *rport = &rphy->ports[index];
>> +		struct phy *phy;
>> +
>> +		phy = devm_phy_create(dev, child_np, &rockchip_usb2phy_ops);
>> +		if (IS_ERR(phy)) {
>> +			dev_err(dev, "failed to create phy\n");
>> +			ret = PTR_ERR(phy);
>> +			goto put_child;
>> +		}
>> +
>> +		rport->phy = phy;
>> +		rport->port_cfg = &rphy->phy_cfg->port_cfgs[index];
>> +
>> +		/* initialize otg/host port separately */
>> +		if (!of_node_cmp(child_np->name, "host-port")) {
>> +			ret = rockchip_usb2phy_host_port_init(rphy, rport,
>> +							      child_np);
>> +			if (ret)
>> +				goto put_child;
>> +		}
>> +
>> +		phy_set_drvdata(rport->phy, rport);
>> +		index++;
> I am concerned about the use of 'index', and how it maps to port_cfgs[]
> and ports[]. If I take the example from the devicetree documentations,
> the host port would get index==1 amd map to rphy->phy_cfg->port_cfgs[1],
> which is empty in rk3366_phy_cfgs. If someone specifies dummy devicetree
> sub-nodes, it would be easy to create references to port_cfgs[2] as well
> as ports[2] or even higher, and the results would be unpredictable.
>
> How about something like the following ?
>
> 		if !of_node_cmp(child_np->name, "host-port")) {
> 			rport->port_cfg =
> 				&rphy->phy_cfg->port_cfgs[USB2PHY_PORT_HOST];
> 			ret = rockchip_usb2phy_host_port_init(...);
> 			...
> 		}
>
> 		phy_set_drvdata(rport->phy, rport);
> 		if (++index >= rphy->phy_cfg->num_ports)
> 			break;

Well, good comments! I am going to correct and test, if it is 
practicable, I will add them in patch v3.

>> +	}
>> +
>> +	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
>> +	return PTR_ERR_OR_ZERO(provider);
>> +
>> +put_child:
>> +	of_node_put(child_np);
>> +	return ret;
>> +}
>> +
>> +static const struct rockchip_usb2phy_cfg rk3366_phy_cfgs = {
>> +	.num_ports	= 1,
>> +	.clkout_ctl	= { 0x0724, 15, 15, 1, 0 },
>> +	.port_cfgs	= (struct rockchip_usb2phy_port_cfg[]) {
>> +		{
>> +			.phy_sus	= { 0x0728, 15, 0, 0, 0x1d1 },
>> +			.ls_det_en	= { 0x0680, 4, 4, 0, 1 },
>> +			.ls_det_st	= { 0x0690, 4, 4, 0, 1 },
>> +			.ls_det_clr	= { 0x06a0, 4, 4, 0, 1 },
>> +			.utmi_ls	= { 0x049c, 14, 13, 0, 1 },
>> +			.utmi_hstdet	= { 0x049c, 12, 12, 0, 1 }
> Assuming this is the host port entry, I am wondering if it would be better
> to explicitly specify the index.
>
> struct rockchip_usb2phy_cfg {
>          unsigned int num_ports;
> 	struct usb2phy_reg clkout_ctl;
> 	struct rockchip_usb2phy_port_cfg port_cfgs[USB2PHY_NUM_PORTS];
> };
>
> ...
>
> static const struct rockchip_usb2phy_cfg rk3366_phy_cfgs = {
> 	.num_ports      = 1,
> 	.clkout_ctl     = { 0x0724, 15, 15, 1, 0 },
> 	.port_cfgs      = {
> 		[USB2PHY_PORT_HOST] = {
> 			.phy_sus        = { 0x0728, 15, 0, 0, 0x1d1 },
> 			.ls_det_en      = { 0x0680, 4, 4, 0, 1 },
> 			.ls_det_st      = { 0x0690, 4, 4, 0, 1 },
> 			.ls_det_clr     = { 0x06a0, 4, 4, 0, 1 },
> 			.utmi_ls        = { 0x049c, 14, 13, 0, 1 },
> 			.utmi_hstdet    = { 0x049c, 12, 12, 0, 1 }
> 		}

Yeah, as mentioned above, I will try together.

>> +	},
>> +};
>> +
>> +static const struct of_device_id rockchip_usb2phy_dt_match[] = {
>> +	{ .compatible = "rockchip,rk3366-usb2phy", .data = &rk3366_phy_cfgs },
>> +	{}
>> +};
>> +MODULE_DEVICE_TABLE(of, rockchip_usb2phy_dt_match);
>> +
>> +static struct platform_driver rockchip_usb2phy_driver = {
>> +	.probe		= rockchip_usb2phy_probe,
>> +	.driver		= {
>> +		.name	= "rockchip-usb2phy",
>> +		.of_match_table = rockchip_usb2phy_dt_match,
>> +	},
>> +};
>> +module_platform_driver(rockchip_usb2phy_driver);
>> +
>> +MODULE_AUTHOR("Frank Wang <[e-mail]>");
>> +MODULE_DESCRIPTION("Rockchip USB2.0 PHY driver");
>> +MODULE_LICENSE("GPL v2");
>

Frank Wang June 6, 2016, 4:51 a.m. UTC | #5

Hi Heiko & Guenter,

On 2016/6/4 5:24, Heiko Stübner wrote:
> Am Freitag, 3. Juni 2016, 12:59:22 schrieb Guenter Roeck:
>> On Thu, Jun 02, 2016 at 02:48:10PM +0800, Frank Wang wrote:
>>> The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
>>> than rk3288 and before, and most of phy-related registers are also
>>> different from the past, so a new phy driver is required necessarily.
>>>
>>> Signed-off-by: Frank Wang <[e-mail]>
>>> ---
>>>
>>> Changes in v2:
>>>   - Changed vbus_host operation from gpio to regulator in *_probe.
>>>   - Improved the fault treatment relate to 480m clock register.
>>>   - Cleaned up some meaningless codes in *_clk480m_disable.
>>>   - made more clear the comment of *_sm_work.
>>>   
>>> [...]
>>>
>>> +static struct clk *
>>> +rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
>>> +{
>>> +	struct device_node *node = rphy->dev->of_node;
>>> +	struct clk *clk;
>>> +	struct clk_init_data init;
>>> +	int ret;
>>> +
>>> +	init.name = "clk_usbphy_480m";
>>> +	init.ops = &rockchip_usb2phy_clkout_ops;
>>> +	init.flags = CLK_IS_ROOT;
>> One more comment:
>>
>> include/linux/clk-provider.h:#define CLK_IS_ROOT                BIT(4) /*
>> Deprecated: Don't use */
>>
>> ... and the definition has been removed in linux-next.
> also, the created clock should be a child of the phy-supply clock. Please take
> a look at the picophy-variant (phy-rockchip-usb) that already handles that
> parent assignment.
>

Okay, I will refer and correct them in the next patch (patch v3) .

BR.
Frank

Patch

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index b869b98..29ef15c 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -347,6 +347,13 @@  config PHY_ROCKCHIP_USB
 	help
 	  Enable this to support the Rockchip USB 2.0 PHY.
 
+config PHY_ROCKCHIP_INNO_USB2
+	tristate "Rockchip INNO USB2PHY Driver"
+	depends on ARCH_ROCKCHIP && OF
+	select GENERIC_PHY
+	help
+	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.
+
 config PHY_ROCKCHIP_EMMC
 	tristate "Rockchip EMMC PHY Driver"
 	depends on ARCH_ROCKCHIP && OF
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 9c3e73c..4963fbc 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -38,6 +38,7 @@  phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+= phy-s5pv210-usb2.o
 obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o
 obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)	+= phy-qcom-apq8064-sata.o
 obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
+obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2)	+= phy-rockchip-inno-usb2.o
 obj-$(CONFIG_PHY_ROCKCHIP_EMMC) += phy-rockchip-emmc.o
 obj-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
 obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
new file mode 100644
index 0000000..eca46ff
--- /dev/null
+++ b/drivers/phy/phy-rockchip-inno-usb2.c
@@ -0,0 +1,604 @@ 
+/*
+ * Rockchip USB2.0 PHY with Innosilicon IP block driver
+ *
+ * Copyright (C) 2016 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * 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.
+ *
+ * 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/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio/consumer.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#define BIT_WRITEABLE_SHIFT	16
+#define SCHEDULE_DELAY	(60 * HZ)
+
+enum rockchip_usb2phy_port_id {
+	USB2PHY_PORT_OTG,
+	USB2PHY_PORT_HOST,
+	USB2PHY_NUM_PORTS,
+};
+
+enum rockchip_usb2phy_host_state {
+	PHY_STATE_HS_ONLINE	= 0,
+	PHY_STATE_DISCONNECT	= 1,
+	PHY_STATE_HS_CONNECT	= 2,
+	PHY_STATE_FS_CONNECT	= 4,
+};
+
+struct usb2phy_reg {
+	unsigned int	offset;
+	unsigned int	bitend;
+	unsigned int	bitstart;
+	unsigned int	disable;
+	unsigned int	enable;
+};
+
+/**
+ * struct rockchip_usb2phy_port_cfg: usb-phy port configuration.
+ * @phy_sus: phy suspend register.
+ * @ls_det_en: linestate detection enable register.
+ * @ls_det_st: linestate detection state register.
+ * @ls_det_clr: linestate detection clear register.
+ * @utmi_ls: utmi linestate state register.
+ * @utmi_hstdet: utmi host disconnect register.
+ */
+struct rockchip_usb2phy_port_cfg {
+	struct usb2phy_reg	phy_sus;
+	struct usb2phy_reg	ls_det_en;
+	struct usb2phy_reg	ls_det_st;
+	struct usb2phy_reg	ls_det_clr;
+	struct usb2phy_reg	utmi_ls;
+	struct usb2phy_reg	utmi_hstdet;
+};
+
+/**
+ * struct rockchip_usb2phy_cfg: usb-phy configuration.
+ * @num_ports: specify how many ports that the phy has.
+ * @clkout_ctl: keep on/turn off output clk of phy.
+ */
+struct rockchip_usb2phy_cfg {
+	unsigned int	num_ports;
+	struct usb2phy_reg	clkout_ctl;
+	const struct rockchip_usb2phy_port_cfg	*port_cfgs;
+};
+
+/**
+ * struct rockchip_usb2phy_port: usb-phy port data.
+ * @port_id: flag for otg port or host port.
+ * @suspended: phy suspended flag.
+ * @ls_irq: IRQ number assigned for linestate detection.
+ * @mutex: for register updating in sm_work.
+ * @sm_work: OTG state machine work.
+ * @phy_cfg: port register configuration, assigned by driver data.
+ */
+struct rockchip_usb2phy_port {
+	struct phy	*phy;
+	unsigned int	port_id;
+	bool		suspended;
+	int		ls_irq;
+	struct mutex	mutex;
+	struct		delayed_work sm_work;
+	const struct	rockchip_usb2phy_port_cfg *port_cfg;
+};
+
+/**
+ * struct rockchip_usb2phy: usb2.0 phy driver data.
+ * @grf: General Register Files regmap.
+ * @clk480m: clock struct of phy output clk.
+ * @clk_hw: clock struct of phy output clk management.
+ * @vbus_host: the regulator for vbus_host supply.
+ * @phy_cfg: phy register configuration, assigned by driver data.
+ * @ports: phy port instance.
+ */
+struct rockchip_usb2phy {
+	struct device	*dev;
+	struct regmap	*grf;
+	struct clk	*clk480m;
+	struct clk_hw	clk480m_hw;
+	struct regulator	*vbus_host;
+	const struct rockchip_usb2phy_cfg	*phy_cfg;
+	struct rockchip_usb2phy_port	ports[USB2PHY_NUM_PORTS];
+};
+
+static inline int property_enable(struct rockchip_usb2phy *rphy,
+				  const struct usb2phy_reg *reg, bool en)
+{
+	unsigned int val, mask, tmp;
+
+	tmp = en ? reg->enable : reg->disable;
+	mask = GENMASK(reg->bitend, reg->bitstart);
+	val = (tmp << reg->bitstart) | (mask << BIT_WRITEABLE_SHIFT);
+
+	return regmap_write(rphy->grf, reg->offset, val);
+}
+
+static inline bool property_enabled(struct rockchip_usb2phy *rphy,
+				    const struct usb2phy_reg *reg)
+{
+	int ret;
+	unsigned int tmp, orig;
+	unsigned int mask = GENMASK(reg->bitend, reg->bitstart);
+
+	ret = regmap_read(rphy->grf, reg->offset, &orig);
+	if (ret)
+		return false;
+
+	tmp = (orig & mask) >> reg->bitstart;
+	return tmp == reg->enable;
+}
+
+static int rockchip_usb2phy_clk480m_enable(struct clk_hw *hw)
+{
+	struct rockchip_usb2phy *rphy =
+		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
+	int ret = 0;
+
+	/* turn on 480m clk output if it is off */
+	if (!property_enabled(rphy, &rphy->phy_cfg->clkout_ctl)) {
+		ret = property_enable(rphy, &rphy->phy_cfg->clkout_ctl, true);
+		if (ret)
+			return ret;
+
+		/* waitting for the clk become stable */
+		mdelay(1);
+	}
+
+	return ret;
+}
+
+static void rockchip_usb2phy_clk480m_disable(struct clk_hw *hw)
+{
+	struct rockchip_usb2phy *rphy =
+		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
+
+	/* turn off 480m clk output */
+	property_enable(rphy, &rphy->phy_cfg->clkout_ctl, false);
+}
+
+static int rockchip_usb2phy_clk480m_enabled(struct clk_hw *hw)
+{
+	struct rockchip_usb2phy *rphy =
+		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
+
+	return property_enabled(rphy, &rphy->phy_cfg->clkout_ctl);
+}
+
+static unsigned long
+rockchip_usb2phy_clk480m_recalc_rate(struct clk_hw *hw,
+				     unsigned long parent_rate)
+{
+	return 480000000;
+}
+
+static const struct clk_ops rockchip_usb2phy_clkout_ops = {
+	.enable = rockchip_usb2phy_clk480m_enable,
+	.disable = rockchip_usb2phy_clk480m_disable,
+	.is_enabled = rockchip_usb2phy_clk480m_enabled,
+	.recalc_rate = rockchip_usb2phy_clk480m_recalc_rate,
+};
+
+static void rockchip_usb2phy_clk480m_unregister(void *data)
+{
+	struct rockchip_usb2phy *rphy = data;
+
+	of_clk_del_provider(rphy->dev->of_node);
+	clk_unregister(rphy->clk480m);
+}
+
+static struct clk *
+rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
+{
+	struct device_node *node = rphy->dev->of_node;
+	struct clk *clk;
+	struct clk_init_data init;
+	int ret;
+
+	init.name = "clk_usbphy_480m";
+	init.ops = &rockchip_usb2phy_clkout_ops;
+	init.flags = CLK_IS_ROOT;
+	init.parent_names = NULL;
+	init.num_parents = 0;
+	rphy->clk480m_hw.init = &init;
+
+	/* optional override of the clockname */
+	of_property_read_string(node, "clock-output-names", &init.name);
+
+	/* register the clock */
+	clk = clk_register(rphy->dev, &rphy->clk480m_hw);
+	if (IS_ERR(clk))
+		return clk;
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (ret < 0)
+		goto err_clk_provider;
+
+	ret = devm_add_action(rphy->dev, rockchip_usb2phy_clk480m_unregister,
+			      rphy);
+	if (ret < 0)
+		goto err_unreg_action;
+
+	return clk;
+
+err_unreg_action:
+	of_clk_del_provider(node);
+err_clk_provider:
+	clk_unregister(clk);
+	return ERR_PTR(ret);
+}
+
+static int rockchip_usb2phy_init(struct phy *phy)
+{
+	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
+	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
+	int ret = 0;
+
+	if (rport->port_id == USB2PHY_PORT_HOST) {
+		/* clear linestate and enable linestate detect irq */
+		mutex_lock(&rport->mutex);
+
+		ret = property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
+		if (ret) {
+			mutex_unlock(&rport->mutex);
+			return ret;
+		}
+
+		ret = property_enable(rphy, &rport->port_cfg->ls_det_en, true);
+		if (ret) {
+			mutex_unlock(&rport->mutex);
+			return ret;
+		}
+
+		mutex_unlock(&rport->mutex);
+		schedule_delayed_work(&rport->sm_work, SCHEDULE_DELAY);
+	}
+
+	return ret;
+}
+
+static int rockchip_usb2phy_resume(struct phy *phy)
+{
+	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
+	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
+	int ret;
+
+	dev_dbg(&rport->phy->dev, "port resume\n");
+
+	ret = clk_prepare_enable(rphy->clk480m);
+	if (ret)
+		return ret;
+
+	ret = property_enable(rphy, &rport->port_cfg->phy_sus, false);
+	if (ret)
+		return ret;
+
+	rport->suspended = false;
+	return 0;
+}
+
+static int rockchip_usb2phy_suspend(struct phy *phy)
+{
+	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
+	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
+	int ret;
+
+	dev_dbg(&rport->phy->dev, "port suspend\n");
+
+	ret = property_enable(rphy, &rport->port_cfg->phy_sus, true);
+	if (ret)
+		return ret;
+
+	rport->suspended = true;
+	clk_disable_unprepare(rphy->clk480m);
+	return 0;
+}
+
+static int rockchip_usb2phy_exit(struct phy *phy)
+{
+	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
+
+	if (rport->port_id == USB2PHY_PORT_HOST)
+		cancel_delayed_work_sync(&rport->sm_work);
+
+	return 0;
+}
+
+static const struct phy_ops rockchip_usb2phy_ops = {
+	.init		= rockchip_usb2phy_init,
+	.exit		= rockchip_usb2phy_exit,
+	.power_on	= rockchip_usb2phy_resume,
+	.power_off	= rockchip_usb2phy_suspend,
+	.owner		= THIS_MODULE,
+};
+
+/*
+ * The function manage host-phy port state and suspend/resume phy port
+ * to save power.
+ *
+ * we rely on utmi_linestate and utmi_hostdisconnect to identify whether
+ * FS/HS is disconnect or not. Besides, we do not need care it is FS
+ * disconnected or HS disconnected, actually, we just only need get the
+ * device is disconnected at last through rearm the delayed work,
+ * to suspend the phy port in _PHY_STATE_DISCONNECT_ case.
+ *
+ * NOTE: It may invoke *phy_suspend or *phy_resume which will invoke some
+ * clk related APIs, so do not invoke it from interrupt context directly.
+ */
+static void rockchip_usb2phy_sm_work(struct work_struct *work)
+{
+	struct rockchip_usb2phy_port *rport =
+		container_of(work, struct rockchip_usb2phy_port, sm_work.work);
+	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
+	unsigned int sh = rport->port_cfg->utmi_hstdet.bitend -
+			  rport->port_cfg->utmi_hstdet.bitstart + 1;
+	unsigned int ul, uhd, state;
+	unsigned int ul_mask, uhd_mask;
+	int ret;
+
+	mutex_lock(&rport->mutex);
+
+	ret = regmap_read(rphy->grf, rport->port_cfg->utmi_ls.offset, &ul);
+	if (ret < 0)
+		goto next_schedule;
+
+	ret = regmap_read(rphy->grf, rport->port_cfg->utmi_hstdet.offset,
+			  &uhd);
+	if (ret < 0)
+		goto next_schedule;
+
+	uhd_mask = GENMASK(rport->port_cfg->utmi_hstdet.bitend,
+			   rport->port_cfg->utmi_hstdet.bitstart);
+	ul_mask = GENMASK(rport->port_cfg->utmi_ls.bitend,
+			  rport->port_cfg->utmi_ls.bitstart);
+
+	/* stitch on utmi_ls and utmi_hstdet as phy state */
+	state = ((uhd & uhd_mask) >> rport->port_cfg->utmi_hstdet.bitstart) |
+		(((ul & ul_mask) >> rport->port_cfg->utmi_ls.bitstart) << sh);
+
+	switch (state) {
+	case PHY_STATE_HS_ONLINE:
+		dev_dbg(&rport->phy->dev, "HS online\n");
+		break;
+	case PHY_STATE_FS_CONNECT:
+		/*
+		 * For FS device, the online state share with connect state
+		 * from utmi_ls and utmi_hstdet register, so we distinguish
+		 * them via suspended flag.
+		 */
+		if (!rport->suspended) {
+			dev_dbg(&rport->phy->dev, "FS online\n");
+			break;
+		}
+		/* fall through */
+	case PHY_STATE_HS_CONNECT:
+		if (rport->suspended) {
+			dev_dbg(&rport->phy->dev, "HS/FS connected\n");
+			rockchip_usb2phy_resume(rport->phy);
+			rport->suspended = false;
+		}
+		break;
+	case PHY_STATE_DISCONNECT:
+		if (!rport->suspended) {
+			dev_dbg(&rport->phy->dev, "HS/FS disconnected\n");
+			rockchip_usb2phy_suspend(rport->phy);
+			rport->suspended = true;
+		}
+
+		/*
+		 * activate the linestate detection to get the next device
+		 * plug-in irq.
+		 */
+		property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
+		property_enable(rphy, &rport->port_cfg->ls_det_en, true);
+
+		/*
+		 * we don't need to rearm the delayed work when the phy port
+		 * is suspended.
+		 */
+		mutex_unlock(&rport->mutex);
+		return;
+	default:
+		dev_dbg(&rport->phy->dev, "unknown phy state\n");
+		break;
+	}
+
+next_schedule:
+	mutex_unlock(&rport->mutex);
+	schedule_delayed_work(&rport->sm_work, SCHEDULE_DELAY);
+}
+
+static irqreturn_t rockchip_usb2phy_linestate_irq(int irq, void *data)
+{
+	struct rockchip_usb2phy_port *rport = data;
+	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
+
+	if (!property_enabled(rphy, &rport->port_cfg->ls_det_st))
+		return IRQ_NONE;
+
+	mutex_lock(&rport->mutex);
+
+	/* disable linestate detect irq and clear its status */
+	property_enable(rphy, &rport->port_cfg->ls_det_en, false);
+	property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
+
+	mutex_unlock(&rport->mutex);
+
+	/*
+	 * In this case for host phy port, a new device is plugged in,
+	 * meanwhile, if the phy port is suspended, we need rearm the work to
+	 * resume it and mange its states; otherwise, we do nothing about that.
+	 */
+	if (rport->suspended && rport->port_id == USB2PHY_PORT_HOST)
+		rockchip_usb2phy_sm_work(&rport->sm_work.work);
+
+	return IRQ_HANDLED;
+}
+
+static int rockchip_usb2phy_host_port_init(struct rockchip_usb2phy *rphy,
+					   struct rockchip_usb2phy_port *rport,
+					   struct device_node *child_np)
+{
+	int ret = 0;
+
+	rport->port_id = USB2PHY_PORT_HOST;
+	mutex_init(&rport->mutex);
+	INIT_DELAYED_WORK(&rport->sm_work, rockchip_usb2phy_sm_work);
+
+	rport->ls_irq = of_irq_get_byname(child_np, "linestate");
+	if (rport->ls_irq < 0) {
+		dev_err(rphy->dev, "no linestate irq provided\n");
+		return rport->ls_irq;
+	}
+
+	ret = devm_request_threaded_irq(rphy->dev, rport->ls_irq, NULL,
+					rockchip_usb2phy_linestate_irq,
+					IRQF_ONESHOT,
+					"rockchip_usb2phy", rport);
+	if (ret) {
+		dev_err(rphy->dev, "failed to request irq handle\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static int rockchip_usb2phy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct device_node *child_np;
+	struct phy_provider *provider;
+	struct rockchip_usb2phy *rphy;
+	const struct of_device_id *match;
+	int index, ret;
+
+	rphy = devm_kzalloc(dev, sizeof(*rphy), GFP_KERNEL);
+	if (!rphy)
+		return -ENOMEM;
+
+	match = of_match_device(dev->driver->of_match_table, dev);
+	if (!match || !match->data) {
+		dev_err(dev, "phy configs are not assigned!\n");
+		return -EINVAL;
+	}
+
+	if (!dev->parent || !dev->parent->of_node)
+		return -ENOMEM;
+
+	rphy->grf = syscon_node_to_regmap(dev->parent->of_node);
+	if (IS_ERR(rphy->grf))
+		return PTR_ERR(rphy->grf);
+
+	rphy->dev = dev;
+	rphy->phy_cfg = match->data;
+	platform_set_drvdata(pdev, rphy);
+
+	rphy->clk480m = rockchip_usb2phy_clk480m_register(rphy);
+	if (IS_ERR(rphy->clk480m))
+		return PTR_ERR(rphy->clk480m);
+
+	rphy->vbus_host = devm_regulator_get_optional(dev, "vbus_host");
+	if (IS_ERR(rphy->vbus_host)) {
+		ret = PTR_ERR(rphy->vbus_host);
+		if (ret == -EPROBE_DEFER)
+			return ret;
+
+		dev_info(dev, "vbus_host regulator is not assigned!\n");
+		rphy->vbus_host = NULL;
+	} else {
+		ret = regulator_enable(rphy->vbus_host);
+		if (ret)
+			return ret;
+	}
+
+	index = 0;
+	for_each_child_of_node(np, child_np) {
+		struct rockchip_usb2phy_port *rport = &rphy->ports[index];
+		struct phy *phy;
+
+		phy = devm_phy_create(dev, child_np, &rockchip_usb2phy_ops);
+		if (IS_ERR(phy)) {
+			dev_err(dev, "failed to create phy\n");
+			ret = PTR_ERR(phy);
+			goto put_child;
+		}
+
+		rport->phy = phy;
+		rport->port_cfg = &rphy->phy_cfg->port_cfgs[index];
+
+		/* initialize otg/host port separately */
+		if (!of_node_cmp(child_np->name, "host-port")) {
+			ret = rockchip_usb2phy_host_port_init(rphy, rport,
+							      child_np);
+			if (ret)
+				goto put_child;
+		}
+
+		phy_set_drvdata(rport->phy, rport);
+		index++;
+	}
+
+	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	return PTR_ERR_OR_ZERO(provider);
+
+put_child:
+	of_node_put(child_np);
+	return ret;
+}
+
+static const struct rockchip_usb2phy_cfg rk3366_phy_cfgs = {
+	.num_ports	= 1,
+	.clkout_ctl	= { 0x0724, 15, 15, 1, 0 },
+	.port_cfgs	= (struct rockchip_usb2phy_port_cfg[]) {
+		{
+			.phy_sus	= { 0x0728, 15, 0, 0, 0x1d1 },
+			.ls_det_en	= { 0x0680, 4, 4, 0, 1 },
+			.ls_det_st	= { 0x0690, 4, 4, 0, 1 },
+			.ls_det_clr	= { 0x06a0, 4, 4, 0, 1 },
+			.utmi_ls	= { 0x049c, 14, 13, 0, 1 },
+			.utmi_hstdet	= { 0x049c, 12, 12, 0, 1 }
+		},
+		{ /* sentinel */ }
+	},
+};
+
+static const struct of_device_id rockchip_usb2phy_dt_match[] = {
+	{ .compatible = "rockchip,rk3366-usb2phy", .data = &rk3366_phy_cfgs },
+	{}
+};
+MODULE_DEVICE_TABLE(of, rockchip_usb2phy_dt_match);
+
+static struct platform_driver rockchip_usb2phy_driver = {
+	.probe		= rockchip_usb2phy_probe,
+	.driver		= {
+		.name	= "rockchip-usb2phy",
+		.of_match_table = rockchip_usb2phy_dt_match,
+	},
+};
+module_platform_driver(rockchip_usb2phy_driver);
+
+MODULE_AUTHOR("Frank Wang <[e-mail]>");
+MODULE_DESCRIPTION("Rockchip USB2.0 PHY driver");
+MODULE_LICENSE("GPL v2");