phy: Group vendor specific phy drivers

Adding vendor specific directories in phy to group
phy drivers under their respective vendor umbrella.

Also updated the MAINTAINERS file to reflect the correct
directory structure for phy drivers.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-omap@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

4 files changed, 863 insertions, 0 deletions

diff --git a/drivers/phy/renesas/Kconfig b/drivers/phy/renesas/Kconfig
new file mode 100644
index 000000000000..432e2715e9c4
--- /dev/null
+++ b/drivers/phy/renesas/Kconfig
@@ -0,0 +1,17 @@
+#
+# Phy drivers for Renesas platforms
+#
+config PHY_RCAR_GEN2
+	tristate "Renesas R-Car generation 2 USB PHY driver"
+	depends on ARCH_RENESAS
+	depends on GENERIC_PHY
+	help
+	  Support for USB PHY found on Renesas R-Car generation 2 SoCs.
+
+config PHY_RCAR_GEN3_USB2
+	tristate "Renesas R-Car generation 3 USB 2.0 PHY driver"
+	depends on ARCH_RENESAS
+	depends on EXTCON
+	select GENERIC_PHY
+	help
+	  Support for USB 2.0 PHY found on Renesas R-Car generation 3 SoCs.
diff --git a/drivers/phy/renesas/Makefile b/drivers/phy/renesas/Makefile
new file mode 100644
index 000000000000..695241aebf69
--- /dev/null
+++ b/drivers/phy/renesas/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_PHY_RCAR_GEN2)		+= phy-rcar-gen2.o
+obj-$(CONFIG_PHY_RCAR_GEN3_USB2)	+= phy-rcar-gen3-usb2.o
diff --git a/drivers/phy/renesas/phy-rcar-gen2.c b/drivers/phy/renesas/phy-rcar-gen2.c
new file mode 100644
index 000000000000..97d4dd6ea924
--- /dev/null
+++ b/drivers/phy/renesas/phy-rcar-gen2.c
@@ -0,0 +1,337 @@
+/*
+ * Renesas R-Car Gen2 PHY driver
+ *
+ * Copyright (C) 2014 Renesas Solutions Corp.
+ * Copyright (C) 2014 Cogent Embedded, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+
+#define USBHS_LPSTS			0x02
+#define USBHS_UGCTRL			0x80
+#define USBHS_UGCTRL2			0x84
+#define USBHS_UGSTS			0x88	/* From technical update */
+
+/* Low Power Status register (LPSTS) */
+#define USBHS_LPSTS_SUSPM		0x4000
+
+/* USB General control register (UGCTRL) */
+#define USBHS_UGCTRL_CONNECT		0x00000004
+#define USBHS_UGCTRL_PLLRESET		0x00000001
+
+/* USB General control register 2 (UGCTRL2) */
+#define USBHS_UGCTRL2_USB2SEL		0x80000000
+#define USBHS_UGCTRL2_USB2SEL_PCI	0x00000000
+#define USBHS_UGCTRL2_USB2SEL_USB30	0x80000000
+#define USBHS_UGCTRL2_USB0SEL		0x00000030
+#define USBHS_UGCTRL2_USB0SEL_PCI	0x00000010
+#define USBHS_UGCTRL2_USB0SEL_HS_USB	0x00000030
+
+/* USB General status register (UGSTS) */
+#define USBHS_UGSTS_LOCK		0x00000100 /* From technical update */
+
+#define PHYS_PER_CHANNEL	2
+
+struct rcar_gen2_phy {
+	struct phy *phy;
+	struct rcar_gen2_channel *channel;
+	int number;
+	u32 select_value;
+};
+
+struct rcar_gen2_channel {
+	struct device_node *of_node;
+	struct rcar_gen2_phy_driver *drv;
+	struct rcar_gen2_phy phys[PHYS_PER_CHANNEL];
+	int selected_phy;
+	u32 select_mask;
+};
+
+struct rcar_gen2_phy_driver {
+	void __iomem *base;
+	struct clk *clk;
+	spinlock_t lock;
+	int num_channels;
+	struct rcar_gen2_channel *channels;
+};
+
+static int rcar_gen2_phy_init(struct phy *p)
+{
+	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
+	struct rcar_gen2_channel *channel = phy->channel;
+	struct rcar_gen2_phy_driver *drv = channel->drv;
+	unsigned long flags;
+	u32 ugctrl2;
+
+	/*
+	 * Try to acquire exclusive access to PHY.  The first driver calling
+	 * phy_init()  on a given channel wins, and all attempts  to use another
+	 * PHY on this channel will fail until phy_exit() is called by the first
+	 * driver.   Achieving this with cmpxcgh() should be SMP-safe.
+	 */
+	if (cmpxchg(&channel->selected_phy, -1, phy->number) != -1)
+		return -EBUSY;
+
+	clk_prepare_enable(drv->clk);
+
+	spin_lock_irqsave(&drv->lock, flags);
+	ugctrl2 = readl(drv->base + USBHS_UGCTRL2);
+	ugctrl2 &= ~channel->select_mask;
+	ugctrl2 |= phy->select_value;
+	writel(ugctrl2, drv->base + USBHS_UGCTRL2);
+	spin_unlock_irqrestore(&drv->lock, flags);
+	return 0;
+}
+
+static int rcar_gen2_phy_exit(struct phy *p)
+{
+	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
+	struct rcar_gen2_channel *channel = phy->channel;
+
+	clk_disable_unprepare(channel->drv->clk);
+
+	channel->selected_phy = -1;
+
+	return 0;
+}
+
+static int rcar_gen2_phy_power_on(struct phy *p)
+{
+	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
+	struct rcar_gen2_phy_driver *drv = phy->channel->drv;
+	void __iomem *base = drv->base;
+	unsigned long flags;
+	u32 value;
+	int err = 0, i;
+
+	/* Skip if it's not USBHS */
+	if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB)
+		return 0;
+
+	spin_lock_irqsave(&drv->lock, flags);
+
+	/* Power on USBHS PHY */
+	value = readl(base + USBHS_UGCTRL);
+	value &= ~USBHS_UGCTRL_PLLRESET;
+	writel(value, base + USBHS_UGCTRL);
+
+	value = readw(base + USBHS_LPSTS);
+	value |= USBHS_LPSTS_SUSPM;
+	writew(value, base + USBHS_LPSTS);
+
+	for (i = 0; i < 20; i++) {
+		value = readl(base + USBHS_UGSTS);
+		if ((value & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) {
+			value = readl(base + USBHS_UGCTRL);
+			value |= USBHS_UGCTRL_CONNECT;
+			writel(value, base + USBHS_UGCTRL);
+			goto out;
+		}
+		udelay(1);
+	}
+
+	/* Timed out waiting for the PLL lock */
+	err = -ETIMEDOUT;
+
+out:
+	spin_unlock_irqrestore(&drv->lock, flags);
+
+	return err;
+}
+
+static int rcar_gen2_phy_power_off(struct phy *p)
+{
+	struct rcar_gen2_phy *phy = phy_get_drvdata(p);
+	struct rcar_gen2_phy_driver *drv = phy->channel->drv;
+	void __iomem *base = drv->base;
+	unsigned long flags;
+	u32 value;
+
+	/* Skip if it's not USBHS */
+	if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB)
+		return 0;
+
+	spin_lock_irqsave(&drv->lock, flags);
+
+	/* Power off USBHS PHY */
+	value = readl(base + USBHS_UGCTRL);
+	value &= ~USBHS_UGCTRL_CONNECT;
+	writel(value, base + USBHS_UGCTRL);
+
+	value = readw(base + USBHS_LPSTS);
+	value &= ~USBHS_LPSTS_SUSPM;
+	writew(value, base + USBHS_LPSTS);
+
+	value = readl(base + USBHS_UGCTRL);
+	value |= USBHS_UGCTRL_PLLRESET;
+	writel(value, base + USBHS_UGCTRL);
+
+	spin_unlock_irqrestore(&drv->lock, flags);
+
+	return 0;
+}
+
+static const struct phy_ops rcar_gen2_phy_ops = {
+	.init		= rcar_gen2_phy_init,
+	.exit		= rcar_gen2_phy_exit,
+	.power_on	= rcar_gen2_phy_power_on,
+	.power_off	= rcar_gen2_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static const struct of_device_id rcar_gen2_phy_match_table[] = {
+	{ .compatible = "renesas,usb-phy-r8a7790" },
+	{ .compatible = "renesas,usb-phy-r8a7791" },
+	{ .compatible = "renesas,usb-phy-r8a7794" },
+	{ .compatible = "renesas,rcar-gen2-usb-phy" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, rcar_gen2_phy_match_table);
+
+static struct phy *rcar_gen2_phy_xlate(struct device *dev,
+				       struct of_phandle_args *args)
+{
+	struct rcar_gen2_phy_driver *drv;
+	struct device_node *np = args->np;
+	int i;
+
+	drv = dev_get_drvdata(dev);
+	if (!drv)
+		return ERR_PTR(-EINVAL);
+
+	for (i = 0; i < drv->num_channels; i++) {
+		if (np == drv->channels[i].of_node)
+			break;
+	}
+
+	if (i >= drv->num_channels || args->args[0] >= 2)
+		return ERR_PTR(-ENODEV);
+
+	return drv->channels[i].phys[args->args[0]].phy;
+}
+
+static const u32 select_mask[] = {
+	[0]	= USBHS_UGCTRL2_USB0SEL,
+	[2]	= USBHS_UGCTRL2_USB2SEL,
+};
+
+static const u32 select_value[][PHYS_PER_CHANNEL] = {
+	[0]	= { USBHS_UGCTRL2_USB0SEL_PCI, USBHS_UGCTRL2_USB0SEL_HS_USB },
+	[2]	= { USBHS_UGCTRL2_USB2SEL_PCI, USBHS_UGCTRL2_USB2SEL_USB30 },
+};
+
+static int rcar_gen2_phy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct rcar_gen2_phy_driver *drv;
+	struct phy_provider *provider;
+	struct device_node *np;
+	struct resource *res;
+	void __iomem *base;
+	struct clk *clk;
+	int i = 0;
+
+	if (!dev->of_node) {
+		dev_err(dev,
+			"This driver is required to be instantiated from device tree\n");
+		return -EINVAL;
+	}
+
+	clk = devm_clk_get(dev, "usbhs");
+	if (IS_ERR(clk)) {
+		dev_err(dev, "Can't get USBHS clock\n");
+		return PTR_ERR(clk);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
+	if (!drv)
+		return -ENOMEM;
+
+	spin_lock_init(&drv->lock);
+
+	drv->clk = clk;
+	drv->base = base;
+
+	drv->num_channels = of_get_child_count(dev->of_node);
+	drv->channels = devm_kcalloc(dev, drv->num_channels,
+				     sizeof(struct rcar_gen2_channel),
+				     GFP_KERNEL);
+	if (!drv->channels)
+		return -ENOMEM;
+
+	for_each_child_of_node(dev->of_node, np) {
+		struct rcar_gen2_channel *channel = drv->channels + i;
+		u32 channel_num;
+		int error, n;
+
+		channel->of_node = np;
+		channel->drv = drv;
+		channel->selected_phy = -1;
+
+		error = of_property_read_u32(np, "reg", &channel_num);
+		if (error || channel_num > 2) {
+			dev_err(dev, "Invalid \"reg\" property\n");
+			return error;
+		}
+		channel->select_mask = select_mask[channel_num];
+
+		for (n = 0; n < PHYS_PER_CHANNEL; n++) {
+			struct rcar_gen2_phy *phy = &channel->phys[n];
+
+			phy->channel = channel;
+			phy->number = n;
+			phy->select_value = select_value[channel_num][n];
+
+			phy->phy = devm_phy_create(dev, NULL,
+						   &rcar_gen2_phy_ops);
+			if (IS_ERR(phy->phy)) {
+				dev_err(dev, "Failed to create PHY\n");
+				return PTR_ERR(phy->phy);
+			}
+			phy_set_drvdata(phy->phy, phy);
+		}
+
+		i++;
+	}
+
+	provider = devm_of_phy_provider_register(dev, rcar_gen2_phy_xlate);
+	if (IS_ERR(provider)) {
+		dev_err(dev, "Failed to register PHY provider\n");
+		return PTR_ERR(provider);
+	}
+
+	dev_set_drvdata(dev, drv);
+
+	return 0;
+}
+
+static struct platform_driver rcar_gen2_phy_driver = {
+	.driver = {
+		.name		= "phy_rcar_gen2",
+		.of_match_table	= rcar_gen2_phy_match_table,
+	},
+	.probe	= rcar_gen2_phy_probe,
+};
+
+module_platform_driver(rcar_gen2_phy_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Renesas R-Car Gen2 PHY");
+MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>");
diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
new file mode 100644
index 000000000000..54c34298a000
--- /dev/null
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -0,0 +1,507 @@
+/*
+ * Renesas R-Car Gen3 for USB2.0 PHY driver
+ *
+ * Copyright (C) 2015 Renesas Electronics Corporation
+ *
+ * This is based on the phy-rcar-gen2 driver:
+ * Copyright (C) 2014 Renesas Solutions Corp.
+ * Copyright (C) 2014 Cogent Embedded, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/extcon.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.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)
+#define USB2_INT_ENABLE_USBH_INTA_EN	BIT(1)
+#define USB2_INT_ENABLE_INIT		(USB2_INT_ENABLE_UCOM_INTEN | \
+					 USB2_INT_ENABLE_USBH_INTB_EN | \
+					 USB2_INT_ENABLE_USBH_INTA_EN)
+
+/* 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_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)
+
+struct rcar_gen3_chan {
+	void __iomem *base;
+	struct extcon_dev *extcon;
+	struct phy *phy;
+	struct regulator *vbus;
+	struct work_struct work;
+	bool extcon_host;
+	bool has_otg;
+};
+
+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->phy->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->phy->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->phy->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_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)
+{
+	void __iomem *usb2_base = ch->base;
+	u32 val;
+
+	val = readl(usb2_base + USB2_OBINTEN);
+	writel(val & ~USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
+
+	rcar_gen3_enable_vbus_ctrl(ch, 0);
+	rcar_gen3_init_for_host(ch);
+
+	writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
+}
+
+static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
+{
+	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 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, is_host, new_mode_is_host;
+
+	if (!ch->has_otg || !ch->phy->init_count)
+		return -EIO;
+
+	/*
+	 * is_b_device: true is B-Device. false is A-Device.
+	 * If {new_mode_}is_host: true is Host mode. false is Peripheral mode.
+	 */
+	is_b_device = rcar_gen3_check_id(ch);
+	is_host = rcar_gen3_is_host(ch);
+	if (!strncmp(buf, "host", strlen("host")))
+		new_mode_is_host = true;
+	else if (!strncmp(buf, "peripheral", strlen("peripheral")))
+		new_mode_is_host = false;
+	else
+		return -EINVAL;
+
+	/* If current and new mode is the same, this returns the error */
+	if (is_host == new_mode_is_host)
+		return -EINVAL;
+
+	if (new_mode_is_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->has_otg || !ch->phy->init_count)
+		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;
+
+	val = readl(usb2_base + USB2_VBCTRL);
+	writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
+	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
+	val = readl(usb2_base + USB2_OBINTEN);
+	writel(val | USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
+	val = readl(usb2_base + USB2_ADPCTRL);
+	writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
+	val = readl(usb2_base + USB2_LINECTRL1);
+	rcar_gen3_set_linectrl(ch, 0, 0);
+	writel(val | USB2_LINECTRL1_DPRPD_EN | USB2_LINECTRL1_DMRPD_EN,
+	       usb2_base + USB2_LINECTRL1);
+
+	rcar_gen3_device_recognition(ch);
+}
+
+static int rcar_gen3_phy_usb2_init(struct phy *p)
+{
+	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
+	void __iomem *usb2_base = channel->base;
+
+	/* Initialize USB2 part */
+	writel(USB2_INT_ENABLE_INIT, 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->has_otg)
+		rcar_gen3_init_otg(channel);
+
+	return 0;
+}
+
+static int rcar_gen3_phy_usb2_exit(struct phy *p)
+{
+	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
+
+	writel(0, channel->base + USB2_INT_ENABLE);
+
+	return 0;
+}
+
+static int rcar_gen3_phy_usb2_power_on(struct phy *p)
+{
+	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
+	void __iomem *usb2_base = channel->base;
+	u32 val;
+	int ret;
+
+	if (channel->vbus) {
+		ret = regulator_enable(channel->vbus);
+		if (ret)
+			return ret;
+	}
+
+	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);
+
+	return 0;
+}
+
+static int rcar_gen3_phy_usb2_power_off(struct phy *p)
+{
+	struct rcar_gen3_chan *channel = phy_get_drvdata(p);
+	int ret = 0;
+
+	if (channel->vbus)
+		ret = regulator_disable(channel->vbus);
+
+	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 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->phy->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-r8a7795" },
+	{ .compatible = "renesas,usb2-phy-r8a7796" },
+	{ .compatible = "renesas,rcar-gen3-usb2-phy" },
+	{ }
+};
+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 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;
+	int irq, ret = 0;
+
+	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) {
+		int ret;
+
+		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->has_otg = true;
+		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);
+	channel->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb2_ops);
+	if (IS_ERR(channel->phy)) {
+		dev_err(dev, "Failed to create USB2 PHY\n");
+		ret = PTR_ERR(channel->phy);
+		goto error;
+	}
+
+	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);
+	phy_set_drvdata(channel->phy, channel);
+
+	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	if (IS_ERR(provider)) {
+		dev_err(dev, "Failed to register PHY provider\n");
+		ret = PTR_ERR(provider);
+		goto error;
+	} else if (channel->has_otg) {
+		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->has_otg)
+		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>");