text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Renesas R-Car Gen3 for USB2.0 PHY driver
   *
   * Copyright (C) 2015-2017 Renesas Electronics Corporation
   *
   * This is based on the phy-rcar-gen2 driver:
   * Copyright (C) 2014 Renesas Solutions Corp.
   * Copyright (C) 2014 Cogent Embedded, Inc.
   */
  
  #include <linux/extcon-provider.h>
  #include <linux/interrupt.h>
  #include <linux/io.h>
  #include <linux/module.h>
  #include <linux/mutex.h>
  #include <linux/of.h>
  #include <linux/of_address.h>
  #include <linux/of_device.h>
  #include <linux/phy/phy.h>
  #include <linux/platform_device.h>
  #include <linux/pm_runtime.h>
  #include <linux/regulator/consumer.h>
  #include <linux/usb/of.h>
  #include <linux/workqueue.h>
  
  /******* USB2.0 Host registers (original offset is +0x200) *******/
  #define USB2_INT_ENABLE		0x000
  #define USB2_USBCTR		0x00c
  #define USB2_SPD_RSM_TIMSET	0x10c
  #define USB2_OC_TIMSET		0x110
  #define USB2_COMMCTRL		0x600
  #define USB2_OBINTSTA		0x604
  #define USB2_OBINTEN		0x608
  #define USB2_VBCTRL		0x60c
  #define USB2_LINECTRL1		0x610
  #define USB2_ADPCTRL		0x630
  
  /* INT_ENABLE */
  #define USB2_INT_ENABLE_UCOM_INTEN	BIT(3)
  #define USB2_INT_ENABLE_USBH_INTB_EN	BIT(2)	/* For EHCI */
  #define USB2_INT_ENABLE_USBH_INTA_EN	BIT(1)	/* For OHCI */
  
  /* USBCTR */
  #define USB2_USBCTR_DIRPD	BIT(2)
  #define USB2_USBCTR_PLL_RST	BIT(1)
  
  /* SPD_RSM_TIMSET */
  #define USB2_SPD_RSM_TIMSET_INIT	0x014e029b
  
  /* OC_TIMSET */
  #define USB2_OC_TIMSET_INIT		0x000209ab
  
  /* COMMCTRL */
  #define USB2_COMMCTRL_OTG_PERI		BIT(31)	/* 1 = Peripheral mode */
  
  /* OBINTSTA and OBINTEN */
  #define USB2_OBINT_SESSVLDCHG		BIT(12)
  #define USB2_OBINT_IDDIGCHG		BIT(11)
  #define USB2_OBINT_BITS			(USB2_OBINT_SESSVLDCHG | \
  					 USB2_OBINT_IDDIGCHG)
  
  /* VBCTRL */
  #define USB2_VBCTRL_OCCLREN		BIT(16)
  #define USB2_VBCTRL_DRVVBUSSEL		BIT(8)
  
  /* LINECTRL1 */
  #define USB2_LINECTRL1_DPRPD_EN		BIT(19)
  #define USB2_LINECTRL1_DP_RPD		BIT(18)
  #define USB2_LINECTRL1_DMRPD_EN		BIT(17)
  #define USB2_LINECTRL1_DM_RPD		BIT(16)
  #define USB2_LINECTRL1_OPMODE_NODRV	BIT(6)
  
  /* ADPCTRL */
  #define USB2_ADPCTRL_OTGSESSVLD		BIT(20)
  #define USB2_ADPCTRL_IDDIG		BIT(19)
  #define USB2_ADPCTRL_IDPULLUP		BIT(5)	/* 1 = ID sampling is enabled */
  #define USB2_ADPCTRL_DRVVBUS		BIT(4)
  
  #define NUM_OF_PHYS			4
  enum rcar_gen3_phy_index {
  	PHY_INDEX_BOTH_HC,
  	PHY_INDEX_OHCI,
  	PHY_INDEX_EHCI,
  	PHY_INDEX_HSUSB
  };
  
  static const u32 rcar_gen3_int_enable[NUM_OF_PHYS] = {
  	USB2_INT_ENABLE_USBH_INTB_EN | USB2_INT_ENABLE_USBH_INTA_EN,
  	USB2_INT_ENABLE_USBH_INTA_EN,
  	USB2_INT_ENABLE_USBH_INTB_EN,
  	0
  };
  
  struct rcar_gen3_phy {
  	struct phy *phy;
  	struct rcar_gen3_chan *ch;
  	u32 int_enable_bits;
  	bool initialized;
  	bool otg_initialized;
  	bool powered;
  };
  
  struct rcar_gen3_chan {
  	void __iomem *base;
  	struct device *dev;	/* platform_device's device */
  	struct extcon_dev *extcon;
  	struct rcar_gen3_phy rphys[NUM_OF_PHYS];
  	struct regulator *vbus;
  	struct work_struct work;
  	struct mutex lock;	/* protects rphys[...].powered */
  	enum usb_dr_mode dr_mode;
  	bool extcon_host;
  	bool is_otg_channel;
  	bool uses_otg_pins;
  };
  
  /*
   * Combination about is_otg_channel and uses_otg_pins:
   *
   * Parameters				|| Behaviors
   * is_otg_channel	| uses_otg_pins	|| irqs		| role sysfs
   * ---------------------+---------------++--------------+------------
   * true			| true		|| enabled	| enabled
   * true                 | false		|| disabled	| enabled
   * false                | any		|| disabled	| disabled
   */
  
  static void rcar_gen3_phy_usb2_work(struct work_struct *work)
  {
  	struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
  						 work);
  
  	if (ch->extcon_host) {
  		extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, true);
  		extcon_set_state_sync(ch->extcon, EXTCON_USB, false);
  	} else {
  		extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, false);
  		extcon_set_state_sync(ch->extcon, EXTCON_USB, true);
  	}
  }
  
  static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
  {
  	void __iomem *usb2_base = ch->base;
  	u32 val = readl(usb2_base + USB2_COMMCTRL);
  
  	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, host);
  	if (host)
  		val &= ~USB2_COMMCTRL_OTG_PERI;
  	else
  		val |= USB2_COMMCTRL_OTG_PERI;
  	writel(val, usb2_base + USB2_COMMCTRL);
  }
  
  static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
  {
  	void __iomem *usb2_base = ch->base;
  	u32 val = readl(usb2_base + USB2_LINECTRL1);
  
  	dev_vdbg(ch->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
  	val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
  	if (dp)
  		val |= USB2_LINECTRL1_DP_RPD;
  	if (dm)
  		val |= USB2_LINECTRL1_DM_RPD;
  	writel(val, usb2_base + USB2_LINECTRL1);
  }
  
  static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
  {
  	void __iomem *usb2_base = ch->base;
  	u32 val = readl(usb2_base + USB2_ADPCTRL);
  
  	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, vbus);
  	if (vbus)
  		val |= USB2_ADPCTRL_DRVVBUS;
  	else
  		val &= ~USB2_ADPCTRL_DRVVBUS;
  	writel(val, usb2_base + USB2_ADPCTRL);
  }
  
  static void rcar_gen3_control_otg_irq(struct rcar_gen3_chan *ch, int enable)
  {
  	void __iomem *usb2_base = ch->base;
  	u32 val = readl(usb2_base + USB2_OBINTEN);
  
  	if (ch->uses_otg_pins && enable)
  		val |= USB2_OBINT_BITS;
  	else
  		val &= ~USB2_OBINT_BITS;
  	writel(val, usb2_base + USB2_OBINTEN);
  }
  
  static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
  {
  	rcar_gen3_set_linectrl(ch, 1, 1);
  	rcar_gen3_set_host_mode(ch, 1);
  	rcar_gen3_enable_vbus_ctrl(ch, 1);
  
  	ch->extcon_host = true;
  	schedule_work(&ch->work);
  }
  
  static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
  {
  	rcar_gen3_set_linectrl(ch, 0, 1);
  	rcar_gen3_set_host_mode(ch, 0);
  	rcar_gen3_enable_vbus_ctrl(ch, 0);
  
  	ch->extcon_host = false;
  	schedule_work(&ch->work);
  }
  
  static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
  {
  	void __iomem *usb2_base = ch->base;
  	u32 val;
  
  	val = readl(usb2_base + USB2_LINECTRL1);
  	writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
  
  	rcar_gen3_set_linectrl(ch, 1, 1);
  	rcar_gen3_set_host_mode(ch, 1);
  	rcar_gen3_enable_vbus_ctrl(ch, 0);
  
  	val = readl(usb2_base + USB2_LINECTRL1);
  	writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
  }
  
  static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
  {
  	rcar_gen3_set_linectrl(ch, 0, 1);
  	rcar_gen3_set_host_mode(ch, 0);
  	rcar_gen3_enable_vbus_ctrl(ch, 1);
  }
  
  static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
  {
  	rcar_gen3_control_otg_irq(ch, 0);
  
  	rcar_gen3_enable_vbus_ctrl(ch, 1);
  	rcar_gen3_init_for_host(ch);
  
  	rcar_gen3_control_otg_irq(ch, 1);
  }
  
  static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
  {
  	if (!ch->uses_otg_pins)
  		return (ch->dr_mode == USB_DR_MODE_HOST) ? false : true;
  
  	return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
  }
  
  static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
  {
  	if (!rcar_gen3_check_id(ch))
  		rcar_gen3_init_for_host(ch);
  	else
  		rcar_gen3_init_for_peri(ch);
  }
  
  static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
  {
  	return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
  }
  
  static enum phy_mode rcar_gen3_get_phy_mode(struct rcar_gen3_chan *ch)
  {
  	if (rcar_gen3_is_host(ch))
  		return PHY_MODE_USB_HOST;
  
  	return PHY_MODE_USB_DEVICE;
  }
  
  static bool rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan *ch)
  {
  	int i;
  
  	for (i = 0; i < NUM_OF_PHYS; i++) {
  		if (ch->rphys[i].initialized)
  			return true;
  	}
  
  	return false;
  }
  
  static bool rcar_gen3_needs_init_otg(struct rcar_gen3_chan *ch)
  {
  	int i;
  
  	for (i = 0; i < NUM_OF_PHYS; i++) {
  		if (ch->rphys[i].otg_initialized)
  			return false;
  	}
  
  	return true;
  }
  
  static bool rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan *ch)
  {
  	int i;
  
  	for (i = 0; i < NUM_OF_PHYS; i++) {
  		if (ch->rphys[i].powered)
  			return false;
  	}
  
  	return true;
  }
  
  static ssize_t role_store(struct device *dev, struct device_attribute *attr,
  			  const char *buf, size_t count)
  {
  	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
  	bool is_b_device;
  	enum phy_mode cur_mode, new_mode;
  
  	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
  		return -EIO;
  
  	if (!strncmp(buf, "host", strlen("host")))
  		new_mode = PHY_MODE_USB_HOST;
  	else if (!strncmp(buf, "peripheral", strlen("peripheral")))
  		new_mode = PHY_MODE_USB_DEVICE;
  	else
  		return -EINVAL;
  
  	/* is_b_device: true is B-Device. false is A-Device. */
  	is_b_device = rcar_gen3_check_id(ch);
  	cur_mode = rcar_gen3_get_phy_mode(ch);
  
  	/* If current and new mode is the same, this returns the error */
  	if (cur_mode == new_mode)
  		return -EINVAL;
  
  	if (new_mode == PHY_MODE_USB_HOST) { /* And is_host must be false */
  		if (!is_b_device)	/* A-Peripheral */
  			rcar_gen3_init_from_a_peri_to_a_host(ch);
  		else			/* B-Peripheral */
  			rcar_gen3_init_for_b_host(ch);
  	} else {			/* And is_host must be true */
  		if (!is_b_device)	/* A-Host */
  			rcar_gen3_init_for_a_peri(ch);
  		else			/* B-Host */
  			rcar_gen3_init_for_peri(ch);
  	}
  
  	return count;
  }
  
  static ssize_t role_show(struct device *dev, struct device_attribute *attr,
  			 char *buf)
  {
  	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
  
  	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
  		return -EIO;
  
  	return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
  							    "peripheral");
  }
  static DEVICE_ATTR_RW(role);
  
  static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
  {
  	void __iomem *usb2_base = ch->base;
  	u32 val;
  
  	/* Should not use functions of read-modify-write a register */
  	val = readl(usb2_base + USB2_LINECTRL1);
  	val = (val & ~USB2_LINECTRL1_DP_RPD) | USB2_LINECTRL1_DPRPD_EN |
  	      USB2_LINECTRL1_DMRPD_EN | USB2_LINECTRL1_DM_RPD;
  	writel(val, usb2_base + USB2_LINECTRL1);
  
  	val = readl(usb2_base + USB2_VBCTRL);
  	val &= ~USB2_VBCTRL_OCCLREN;
  	writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
  	val = readl(usb2_base + USB2_ADPCTRL);
  	writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
  
  	msleep(20);
  
  	writel(0xffffffff, usb2_base + USB2_OBINTSTA);
  	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
  
  	rcar_gen3_device_recognition(ch);
  }
  
  static int rcar_gen3_phy_usb2_init(struct phy *p)
  {
  	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
  	struct rcar_gen3_chan *channel = rphy->ch;
  	void __iomem *usb2_base = channel->base;
  	u32 val;
  
  	/* Initialize USB2 part */
  	val = readl(usb2_base + USB2_INT_ENABLE);
  	val |= USB2_INT_ENABLE_UCOM_INTEN | rphy->int_enable_bits;
  	writel(val, usb2_base + USB2_INT_ENABLE);
  	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
  	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
  
  	/* Initialize otg part */
  	if (channel->is_otg_channel) {
  		if (rcar_gen3_needs_init_otg(channel))
  			rcar_gen3_init_otg(channel);
  		rphy->otg_initialized = true;
  	}
  
  	rphy->initialized = true;
  
  	return 0;
  }
  
  static int rcar_gen3_phy_usb2_exit(struct phy *p)
  {
  	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
  	struct rcar_gen3_chan *channel = rphy->ch;
  	void __iomem *usb2_base = channel->base;
  	u32 val;
  
  	rphy->initialized = false;
  
  	if (channel->is_otg_channel)
  		rphy->otg_initialized = false;
  
  	val = readl(usb2_base + USB2_INT_ENABLE);
  	val &= ~rphy->int_enable_bits;
  	if (!rcar_gen3_is_any_rphy_initialized(channel))
  		val &= ~USB2_INT_ENABLE_UCOM_INTEN;
  	writel(val, usb2_base + USB2_INT_ENABLE);
  
  	return 0;
  }
  
  static int rcar_gen3_phy_usb2_power_on(struct phy *p)
  {
  	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
  	struct rcar_gen3_chan *channel = rphy->ch;
  	void __iomem *usb2_base = channel->base;
  	u32 val;
  	int ret = 0;
  
  	mutex_lock(&channel->lock);
  	if (!rcar_gen3_are_all_rphys_power_off(channel))
  		goto out;
  
  	if (channel->vbus) {
  		ret = regulator_enable(channel->vbus);
  		if (ret)
  			goto out;
  	}
  
  	val = readl(usb2_base + USB2_USBCTR);
  	val |= USB2_USBCTR_PLL_RST;
  	writel(val, usb2_base + USB2_USBCTR);
  	val &= ~USB2_USBCTR_PLL_RST;
  	writel(val, usb2_base + USB2_USBCTR);
  
  out:
  	/* The powered flag should be set for any other phys anyway */
  	rphy->powered = true;
  	mutex_unlock(&channel->lock);
  
  	return 0;
  }
  
  static int rcar_gen3_phy_usb2_power_off(struct phy *p)
  {
  	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
  	struct rcar_gen3_chan *channel = rphy->ch;
  	int ret = 0;
  
  	mutex_lock(&channel->lock);
  	rphy->powered = false;
  
  	if (!rcar_gen3_are_all_rphys_power_off(channel))
  		goto out;
  
  	if (channel->vbus)
  		ret = regulator_disable(channel->vbus);
  
  out:
  	mutex_unlock(&channel->lock);
  
  	return ret;
  }
  
  static const struct phy_ops rcar_gen3_phy_usb2_ops = {
  	.init		= rcar_gen3_phy_usb2_init,
  	.exit		= rcar_gen3_phy_usb2_exit,
  	.power_on	= rcar_gen3_phy_usb2_power_on,
  	.power_off	= rcar_gen3_phy_usb2_power_off,
  	.owner		= THIS_MODULE,
  };
  
  static const struct phy_ops rz_g1c_phy_usb2_ops = {
  	.init		= rcar_gen3_phy_usb2_init,
  	.exit		= rcar_gen3_phy_usb2_exit,
  	.owner		= THIS_MODULE,
  };
  
  static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
  {
  	struct rcar_gen3_chan *ch = _ch;
  	void __iomem *usb2_base = ch->base;
  	u32 status = readl(usb2_base + USB2_OBINTSTA);
  	irqreturn_t ret = IRQ_NONE;
  
  	if (status & USB2_OBINT_BITS) {
  		dev_vdbg(ch->dev, "%s: %08x\n", __func__, status);
  		writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
  		rcar_gen3_device_recognition(ch);
  		ret = IRQ_HANDLED;
  	}
  
  	return ret;
  }
  
  static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
  	{
  		.compatible = "renesas,usb2-phy-r8a77470",
  		.data = &rz_g1c_phy_usb2_ops,
  	},
  	{
  		.compatible = "renesas,usb2-phy-r8a7795",
  		.data = &rcar_gen3_phy_usb2_ops,
  	},
  	{
  		.compatible = "renesas,usb2-phy-r8a7796",
  		.data = &rcar_gen3_phy_usb2_ops,
  	},
  	{
  		.compatible = "renesas,usb2-phy-r8a77965",
  		.data = &rcar_gen3_phy_usb2_ops,
  	},
  	{
  		.compatible = "renesas,rcar-gen3-usb2-phy",
  		.data = &rcar_gen3_phy_usb2_ops,
  	},
  	{ /* sentinel */ },
  };
  MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
  
  static const unsigned int rcar_gen3_phy_cable[] = {
  	EXTCON_USB,
  	EXTCON_USB_HOST,
  	EXTCON_NONE,
  };
  
  static struct phy *rcar_gen3_phy_usb2_xlate(struct device *dev,
  					    struct of_phandle_args *args)
  {
  	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
  
  	if (args->args_count == 0)	/* For old version dts */
  		return ch->rphys[PHY_INDEX_BOTH_HC].phy;
  	else if (args->args_count > 1)	/* Prevent invalid args count */
  		return ERR_PTR(-ENODEV);
  
  	if (args->args[0] >= NUM_OF_PHYS)
  		return ERR_PTR(-ENODEV);
  
  	return ch->rphys[args->args[0]].phy;
  }
  
  static enum usb_dr_mode rcar_gen3_get_dr_mode(struct device_node *np)
  {
  	enum usb_dr_mode candidate = USB_DR_MODE_UNKNOWN;
  	int i;
  
  	/*
  	 * If one of device nodes has other dr_mode except UNKNOWN,
  	 * this function returns UNKNOWN. To achieve backward compatibility,
  	 * this loop starts the index as 0.
  	 */
  	for (i = 0; i < NUM_OF_PHYS; i++) {
  		enum usb_dr_mode mode = of_usb_get_dr_mode_by_phy(np, i);
  
  		if (mode != USB_DR_MODE_UNKNOWN) {
  			if (candidate == USB_DR_MODE_UNKNOWN)
  				candidate = mode;
  			else if (candidate != mode)
  				return USB_DR_MODE_UNKNOWN;
  		}
  	}
  
  	return candidate;
  }
  
  static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
  	struct rcar_gen3_chan *channel;
  	struct phy_provider *provider;
  	struct resource *res;
  	const struct phy_ops *phy_usb2_ops;
  	int irq, ret = 0, i;
  
  	if (!dev->of_node) {
  		dev_err(dev, "This driver needs device tree\n");
  		return -EINVAL;
  	}
  
  	channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
  	if (!channel)
  		return -ENOMEM;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	channel->base = devm_ioremap_resource(dev, res);
  	if (IS_ERR(channel->base))
  		return PTR_ERR(channel->base);
  
  	/* call request_irq for OTG */
  	irq = platform_get_irq(pdev, 0);
  	if (irq >= 0) {
  		INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
  		irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
  				       IRQF_SHARED, dev_name(dev), channel);
  		if (irq < 0)
  			dev_err(dev, "No irq handler (%d)\n", irq);
  	}
  
  	channel->dr_mode = rcar_gen3_get_dr_mode(dev->of_node);
  	if (channel->dr_mode != USB_DR_MODE_UNKNOWN) {
  		int ret;
  
  		channel->is_otg_channel = true;
  		channel->uses_otg_pins = !of_property_read_bool(dev->of_node,
  							"renesas,no-otg-pins");
  		channel->extcon = devm_extcon_dev_allocate(dev,
  							rcar_gen3_phy_cable);
  		if (IS_ERR(channel->extcon))
  			return PTR_ERR(channel->extcon);
  
  		ret = devm_extcon_dev_register(dev, channel->extcon);
  		if (ret < 0) {
  			dev_err(dev, "Failed to register extcon\n");
  			return ret;
  		}
  	}
  
  	/*
  	 * devm_phy_create() will call pm_runtime_enable(&phy->dev);
  	 * And then, phy-core will manage runtime pm for this device.
  	 */
  	pm_runtime_enable(dev);
  	phy_usb2_ops = of_device_get_match_data(dev);
  	if (!phy_usb2_ops)
  		return -EINVAL;
  
  	mutex_init(&channel->lock);
  	for (i = 0; i < NUM_OF_PHYS; i++) {
  		channel->rphys[i].phy = devm_phy_create(dev, NULL,
  							phy_usb2_ops);
  		if (IS_ERR(channel->rphys[i].phy)) {
  			dev_err(dev, "Failed to create USB2 PHY\n");
  			ret = PTR_ERR(channel->rphys[i].phy);
  			goto error;
  		}
  		channel->rphys[i].ch = channel;
  		channel->rphys[i].int_enable_bits = rcar_gen3_int_enable[i];
  		phy_set_drvdata(channel->rphys[i].phy, &channel->rphys[i]);
  	}
  
  	channel->vbus = devm_regulator_get_optional(dev, "vbus");
  	if (IS_ERR(channel->vbus)) {
  		if (PTR_ERR(channel->vbus) == -EPROBE_DEFER) {
  			ret = PTR_ERR(channel->vbus);
  			goto error;
  		}
  		channel->vbus = NULL;
  	}
  
  	platform_set_drvdata(pdev, channel);
  	channel->dev = dev;
  
  	provider = devm_of_phy_provider_register(dev, rcar_gen3_phy_usb2_xlate);
  	if (IS_ERR(provider)) {
  		dev_err(dev, "Failed to register PHY provider\n");
  		ret = PTR_ERR(provider);
  		goto error;
  	} else if (channel->is_otg_channel) {
  		int ret;
  
  		ret = device_create_file(dev, &dev_attr_role);
  		if (ret < 0)
  			goto error;
  	}
  
  	return 0;
  
  error:
  	pm_runtime_disable(dev);
  
  	return ret;
  }
  
  static int rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
  {
  	struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);
  
  	if (channel->is_otg_channel)
  		device_remove_file(&pdev->dev, &dev_attr_role);
  
  	pm_runtime_disable(&pdev->dev);
  
  	return 0;
  };
  
  static struct platform_driver rcar_gen3_phy_usb2_driver = {
  	.driver = {
  		.name		= "phy_rcar_gen3_usb2",
  		.of_match_table	= rcar_gen3_phy_usb2_match_table,
  	},
  	.probe	= rcar_gen3_phy_usb2_probe,
  	.remove = rcar_gen3_phy_usb2_remove,
  };
  module_platform_driver(rcar_gen3_phy_usb2_driver);
  
  MODULE_LICENSE("GPL v2");
  MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
  MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
  