From: Vivek Gautam <gautam.vivek@samsung.com>
To: linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
        gregkh@linuxfoundation.org, kishon@ti.com, kgene.kim@samsung.com,
        k.debski@samsung.com, s.nawrocki@samsung.com, t.figa@samsung.com,
        balbi@ti.com, jwerner@chromium.org, jg1.han@samsung.com
Subject: [PATCH RFC 1/4] phy: Add new Exynos5 USB 3.0 PHY driver
Date: Thu, 31 Oct 2013 13:15:41 +0530
Message-id: <1383205544-32244-2-git-send-email-gautam.vivek@samsung.com>
In-reply-to: <1383205544-32244-1-git-send-email-gautam.vivek@samsung.com>
References: <1383205544-32244-1-git-send-email-gautam.vivek@samsung.com>
DLP-Filter: Pass
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 17938
Lines: 642

Add a new driver for the USB 3.0 PHY on Exynos5 series of SoCs.
The new driver uses the generic PHY framework and will interact
with DWC3 controller present on Exynos5 series of SoCs.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
---
 .../devicetree/bindings/phy/samsung-phy.txt        |   20 +
 drivers/phy/Kconfig                                |    7 +
 drivers/phy/Makefile                               |    1 +
 drivers/phy/phy-exynos5-usb3.c                     |  562 ++++++++++++++++++++
 4 files changed, 590 insertions(+), 0 deletions(-)
 create mode 100644 drivers/phy/phy-exynos5-usb3.c

diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
index c0fccaa..9b5c111 100644
--- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
+++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
@@ -20,3 +20,23 @@ Required properties:
 - compatible : should be "samsung,exynos5250-dp-video-phy";
 - reg : offset and length of the Display Port PHY register set;
 - #phy-cells : from the generic PHY bindings, must be 0;
+
+Samsung Exynos5 SoC seiries USB 3.0 PHY controller
+--------------------------------------------------
+
+Required properties:
+- compatible :
+	should be "samsung,exynos5250-usb3phy" for exynos5250 SoC
+	should be "samsung,exynos5420-usb3phy" for exynos5420 SoC
+- reg : Register offset and length array
+	- first field corresponds to USB 3.0 PHY register set;
+	- second field corresponds to PHY power isolation register
+	  present in PMU;
+- clocks: Clock IDs array as required by the controller
+- clock-names: names of clocks correseponding to IDs in the clock property;
+	Required clocks:
+	- first clock is main PHY clock (same as USB 3.0 controller IP clock)
+	- second clock is reference clock (usually crystal clock)
+	optional clock:
+	- third clock is special clock used by PHY for operation
+- #phy-cells : from the generic PHY bindings, must be 0;
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index a344f3d..9a100c6 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -51,4 +51,11 @@ config PHY_EXYNOS_DP_VIDEO
 	help
 	  Support for Display Port PHY found on Samsung EXYNOS SoCs.
 
+config PHY_EXYNOS5_USB3
+	tristate "Exynos5 SoC series USB 3.0 PHY driver"
+	depends on ARCH_EXYNOS5
+	select GENERIC_PHY
+	help
+	  Enable USB 3.0 PHY support for Exynos 5 SoC series
+
 endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index d0caae9..9c06a61 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO)	+= phy-exynos-dp-video.o
 obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO)	+= phy-exynos-mipi-video.o
 obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o
 obj-$(CONFIG_TWL4030_USB)		+= phy-twl4030-usb.o
+obj-$(CONFIG_PHY_EXYNOS5_USB3)		+= phy-exynos5-usb3.o
diff --git a/drivers/phy/phy-exynos5-usb3.c b/drivers/phy/phy-exynos5-usb3.c
new file mode 100644
index 0000000..b9a2674
--- /dev/null
+++ b/drivers/phy/phy-exynos5-usb3.c
@@ -0,0 +1,562 @@
+/*
+ * Samsung EXYNOS5 SoC series USB 3.0 PHY driver
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Vivek Gautam <gautam.vivek@samsung.com>
+ *
+ * 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/kernel.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/mutex.h>
+
+/* Exynos USB PHY registers */
+#define EXYNOS5_FSEL_9MHZ6		0x0
+#define EXYNOS5_FSEL_10MHZ		0x1
+#define EXYNOS5_FSEL_12MHZ		0x2
+#define EXYNOS5_FSEL_19MHZ2		0x3
+#define EXYNOS5_FSEL_20MHZ		0x4
+#define EXYNOS5_FSEL_24MHZ		0x5
+#define EXYNOS5_FSEL_50MHZ		0x7
+
+/* EXYNOS5: USB 3.0 DRD PHY registers */
+#define EXYNOS5_DRD_LINKSYSTEM			(0x04)
+
+#define LINKSYSTEM_FLADJ_MASK			(0x3f << 1)
+#define LINKSYSTEM_FLADJ(_x)			((_x) << 1)
+#define LINKSYSTEM_XHCI_VERSION_CONTROL		(0x1 << 27)
+
+#define EXYNOS5_DRD_PHYUTMI			(0x08)
+
+#define PHYUTMI_OTGDISABLE			(0x1 << 6)
+#define PHYUTMI_FORCESUSPEND			(0x1 << 1)
+#define PHYUTMI_FORCESLEEP			(0x1 << 0)
+
+#define EXYNOS5_DRD_PHYPIPE			(0x0c)
+
+#define EXYNOS5_DRD_PHYCLKRST			(0x10)
+
+#define PHYCLKRST_SSC_REFCLKSEL_MASK		(0xff << 23)
+#define PHYCLKRST_SSC_REFCLKSEL(_x)		((_x) << 23)
+
+#define PHYCLKRST_SSC_RANGE_MASK		(0x03 << 21)
+#define PHYCLKRST_SSC_RANGE(_x)			((_x) << 21)
+
+#define PHYCLKRST_SSC_EN			(0x1 << 20)
+#define PHYCLKRST_REF_SSP_EN			(0x1 << 19)
+#define PHYCLKRST_REF_CLKDIV2			(0x1 << 18)
+
+#define PHYCLKRST_MPLL_MULTIPLIER_MASK		(0x7f << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF	(0x19 << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_50M_REF	(0x02 << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF	(0x68 << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF	(0x7d << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF	(0x02 << 11)
+
+#define PHYCLKRST_FSEL_MASK			(0x3f << 5)
+#define PHYCLKRST_FSEL(_x)			((_x) << 5)
+#define PHYCLKRST_FSEL_PAD_100MHZ		(0x27 << 5)
+#define PHYCLKRST_FSEL_PAD_24MHZ		(0x2a << 5)
+#define PHYCLKRST_FSEL_PAD_20MHZ		(0x31 << 5)
+#define PHYCLKRST_FSEL_PAD_19_2MHZ		(0x38 << 5)
+
+#define PHYCLKRST_RETENABLEN			(0x1 << 4)
+
+#define PHYCLKRST_REFCLKSEL_MASK		(0x03 << 2)
+#define PHYCLKRST_REFCLKSEL_PAD_REFCLK		(0x2 << 2)
+#define PHYCLKRST_REFCLKSEL_EXT_REFCLK		(0x3 << 2)
+
+#define PHYCLKRST_PORTRESET			(0x1 << 1)
+#define PHYCLKRST_COMMONONN			(0x1 << 0)
+
+#define EXYNOS5_DRD_PHYREG0			(0x14)
+#define EXYNOS5_DRD_PHYREG1			(0x18)
+
+#define EXYNOS5_DRD_PHYPARAM0			(0x1c)
+
+#define PHYPARAM0_REF_USE_PAD			(0x1 << 31)
+#define PHYPARAM0_REF_LOSLEVEL_MASK		(0x1f << 26)
+#define PHYPARAM0_REF_LOSLEVEL			(0x9 << 26)
+
+#define EXYNOS5_DRD_PHYPARAM1			(0x20)
+
+#define PHYPARAM1_PCS_TXDEEMPH_MASK		(0x1f << 0)
+#define PHYPARAM1_PCS_TXDEEMPH			(0x1c)
+
+#define EXYNOS5_DRD_PHYTERM			(0x24)
+
+#define EXYNOS5_DRD_PHYTEST			(0x28)
+
+#define PHYTEST_POWERDOWN_SSP			(0x1 << 3)
+#define PHYTEST_POWERDOWN_HSP			(0x1 << 2)
+
+#define EXYNOS5_DRD_PHYADP			(0x2c)
+
+#define EXYNOS5_DRD_PHYBATCHG			(0x30)
+
+#define PHYBATCHG_UTMI_CLKSEL			(0x1 << 2)
+
+#define EXYNOS5_DRD_PHYRESUME			(0x34)
+#define EXYNOS5_DRD_LINKPORT			(0x44)
+
+
+/* Isolation, configured in the power management unit */
+#define EXYNOS5_USB_ISOL_DRD		(1 << 0)
+
+#define CLKSEL_ERROR                       -1
+
+#ifndef KHZ
+#define KHZ 1000
+#endif
+
+#ifndef MHZ
+#define MHZ (KHZ * KHZ)
+#endif
+
+enum samsung_cpu_type {
+	TYPE_EXYNOS5250,
+	TYPE_EXYNOS5420,
+};
+
+enum usb3phy_state {
+	STATE_OFF,
+	STATE_ON,
+};
+
+struct usb3phy_config {
+	enum samsung_cpu_type cpu;
+	bool has_sclk_usbphy30;
+};
+
+struct usb3phy_instance {
+	char *label;
+	struct usb3phy_driver *drv;
+	struct phy *phy;
+	enum usb3phy_state state;
+	u32 clk;
+	unsigned long rate;
+};
+
+struct usb3phy_driver {
+	struct device *dev;
+	void __iomem *reg_phy;
+	void __iomem *reg_isol;
+	struct clk *clk;
+	struct clk *sclk_usbphy30;
+	struct usb3phy_instance instance;
+};
+
+/*
+ * exynos5_rate_to_clk() converts the supplied clock rate to the value that
+ * can be written to the phy register.
+ */
+static u32 exynos5_rate_to_clk(unsigned long rate)
+{
+	unsigned int clksel;
+
+	/* EXYNOS5_FSEL_MASK */
+
+	switch (rate) {
+	case 9600 * KHZ:
+		clksel = EXYNOS5_FSEL_9MHZ6;
+		break;
+	case 10 * MHZ:
+		clksel = EXYNOS5_FSEL_10MHZ;
+		break;
+	case 12 * MHZ:
+		clksel = EXYNOS5_FSEL_12MHZ;
+		break;
+	case 19200 * KHZ:
+		clksel = EXYNOS5_FSEL_19MHZ2;
+		break;
+	case 20 * MHZ:
+		clksel = EXYNOS5_FSEL_20MHZ;
+		break;
+	case 24 * MHZ:
+		clksel = EXYNOS5_FSEL_24MHZ;
+		break;
+	case 50 * MHZ:
+		clksel = EXYNOS5_FSEL_50MHZ;
+		break;
+	default:
+		clksel = CLKSEL_ERROR;
+	}
+
+	return clksel;
+}
+
+static void exynos5_usb3phy_isol(struct usb3phy_instance *inst, bool on)
+{
+	struct usb3phy_driver *drv = inst->drv;
+	u32 tmp;
+
+	if (!drv->reg_isol)
+		return;
+
+	tmp = readl(drv->reg_isol);
+	if (on)
+		tmp &= ~EXYNOS5_USB_ISOL_DRD;
+	else
+		tmp |= EXYNOS5_USB_ISOL_DRD;
+	writel(tmp, drv->reg_isol);
+}
+
+/*
+ * Sets the phy clk as EXTREFCLK (XXTI) which is internal clock from clock core.
+ */
+static u32 exynos5_usb3phy_set_refclk(struct usb3phy_instance *inst)
+{
+	u32 reg;
+	u32 refclk;
+
+	refclk = inst->clk;
+
+	reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
+		PHYCLKRST_FSEL(refclk);
+
+	switch (refclk) {
+	case EXYNOS5_FSEL_50MHZ:
+		reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF |
+			PHYCLKRST_SSC_REFCLKSEL(0x00));
+		break;
+	case EXYNOS5_FSEL_20MHZ:
+		reg |= (PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF |
+			PHYCLKRST_SSC_REFCLKSEL(0x00));
+		break;
+	case EXYNOS5_FSEL_19MHZ2:
+		reg |= (PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF |
+			PHYCLKRST_SSC_REFCLKSEL(0x88));
+		break;
+	case EXYNOS5_FSEL_24MHZ:
+	default:
+		reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
+			PHYCLKRST_SSC_REFCLKSEL(0x88));
+		break;
+	}
+
+	return reg;
+}
+
+static void exynos5_usb3phy_init(struct usb3phy_instance *inst)
+{
+	struct usb3phy_driver *drv = inst->drv;
+	u32 phyparam0;
+	u32 phyparam1;
+	u32 linksystem;
+	u32 phybatchg;
+	u32 phytest;
+	u32 phyclkrst;
+
+	/* Reset USB 3.0 PHY */
+	writel(0x0, drv->reg_phy + EXYNOS5_DRD_PHYREG0);
+
+	phyparam0 = readl(drv->reg_phy + EXYNOS5_DRD_PHYPARAM0);
+	/* Select PHY CLK source */
+	phyparam0 &= ~PHYPARAM0_REF_USE_PAD;
+	/* Set Loss-of-Signal Detector sensitivity */
+	phyparam0 &= ~PHYPARAM0_REF_LOSLEVEL_MASK;
+	phyparam0 |= PHYPARAM0_REF_LOSLEVEL;
+	writel(phyparam0, drv->reg_phy + EXYNOS5_DRD_PHYPARAM0);
+
+	writel(0x0, drv->reg_phy + EXYNOS5_DRD_PHYRESUME);
+
+	/*
+	 * Setting the Frame length Adj value[6:1] to default 0x20
+	 * See xHCI 1.0 spec, 5.2.4
+	 */
+	linksystem = LINKSYSTEM_XHCI_VERSION_CONTROL |
+		     LINKSYSTEM_FLADJ(0x20);
+	writel(linksystem, drv->reg_phy + EXYNOS5_DRD_LINKSYSTEM);
+
+	phyparam1 = readl(drv->reg_phy + EXYNOS5_DRD_PHYPARAM1);
+	/* Set Tx De-Emphasis level */
+	phyparam1 &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
+	phyparam1 |= PHYPARAM1_PCS_TXDEEMPH;
+	writel(phyparam1, drv->reg_phy + EXYNOS5_DRD_PHYPARAM1);
+
+	phybatchg = readl(drv->reg_phy + EXYNOS5_DRD_PHYBATCHG);
+	phybatchg |= PHYBATCHG_UTMI_CLKSEL;
+	writel(phybatchg, drv->reg_phy + EXYNOS5_DRD_PHYBATCHG);
+
+	/* PHYTEST POWERDOWN Control */
+	phytest = readl(drv->reg_phy + EXYNOS5_DRD_PHYTEST);
+	phytest &= ~(PHYTEST_POWERDOWN_SSP |
+		     PHYTEST_POWERDOWN_HSP);
+	writel(phytest, drv->reg_phy + EXYNOS5_DRD_PHYTEST);
+
+	/* UTMI Power Control */
+	writel(PHYUTMI_OTGDISABLE, drv->reg_phy + EXYNOS5_DRD_PHYUTMI);
+
+	phyclkrst = exynos5_usb3phy_set_refclk(inst);
+
+	phyclkrst |= PHYCLKRST_PORTRESET |
+		     /* Digital power supply in normal operating mode */
+		     PHYCLKRST_RETENABLEN |
+		     /* Enable ref clock for SS function */
+		     PHYCLKRST_REF_SSP_EN |
+		     /* Enable spread spectrum */
+		     PHYCLKRST_SSC_EN |
+		     /* Power down HS Bias and PLL blocks in suspend mode */
+		     PHYCLKRST_COMMONONN;
+
+	writel(phyclkrst, drv->reg_phy + EXYNOS5_DRD_PHYCLKRST);
+
+	udelay(10);
+
+	phyclkrst &= ~PHYCLKRST_PORTRESET;
+	writel(phyclkrst, drv->reg_phy + EXYNOS5_DRD_PHYCLKRST);
+
+}
+
+static void exynos5_usb3phy_exit(struct usb3phy_instance *inst)
+{
+	struct usb3phy_driver *drv = inst->drv;
+	u32 phyutmi;
+	u32 phyclkrst;
+	u32 phytest;
+
+	phyutmi = PHYUTMI_OTGDISABLE |
+		  PHYUTMI_FORCESUSPEND |
+		  PHYUTMI_FORCESLEEP;
+	writel(phyutmi, drv->reg_phy + EXYNOS5_DRD_PHYUTMI);
+
+	/* Resetting the PHYCLKRST enable bits to reduce leakage current */
+	phyclkrst = readl(drv->reg_phy + EXYNOS5_DRD_PHYCLKRST);
+	phyclkrst &= ~(PHYCLKRST_REF_SSP_EN |
+		       PHYCLKRST_SSC_EN |
+		       PHYCLKRST_COMMONONN);
+	writel(phyclkrst, drv->reg_phy + EXYNOS5_DRD_PHYCLKRST);
+
+	/* Control PHYTEST to remove leakage current */
+	phytest = readl(drv->reg_phy + EXYNOS5_DRD_PHYTEST);
+	phytest |= PHYTEST_POWERDOWN_SSP |
+		   PHYTEST_POWERDOWN_HSP;
+	writel(phytest, drv->reg_phy + EXYNOS5_DRD_PHYTEST);
+}
+
+static int exynos5_usb3phy_power_on(struct phy *phy)
+{
+	struct usb3phy_instance *inst = phy_get_drvdata(phy);
+	struct usb3phy_driver *drv = inst->drv;
+	int ret;
+
+	dev_info(drv->dev, "Request to power_on \"%s\" usb phy\n",
+							inst->label);
+
+	if (drv->sclk_usbphy30)
+		clk_prepare_enable(drv->sclk_usbphy30);
+
+	ret = clk_prepare_enable(drv->clk);
+	if (ret)
+		return ret;
+
+	if (inst->state == STATE_ON) {
+		dev_err(drv->dev, "usb phy \"%s\" already on",
+							inst->label);
+		ret = -ENODEV;
+		goto err0;
+	}
+
+	inst->state = STATE_ON;
+
+	/* Initialize the PHY and power it ON */
+	exynos5_usb3phy_init(inst);
+	exynos5_usb3phy_isol(inst, 0);
+
+err0:
+	clk_disable_unprepare(drv->clk);
+
+	return ret;
+}
+
+static int exynos5_usb3phy_power_off(struct phy *phy)
+{
+	struct usb3phy_instance *inst = phy_get_drvdata(phy);
+	struct usb3phy_driver *drv = inst->drv;
+	int ret;
+
+	dev_info(drv->dev, "Request to power_off \"%s\" usb phy\n",
+							inst->label);
+	ret = clk_prepare_enable(drv->clk);
+	if (ret)
+		return ret;
+
+	if (inst->state == STATE_OFF) {
+		dev_err(drv->dev, "usb phy \"%s\" already off",
+							inst->label);
+		ret = -ENODEV;
+		goto err0;
+	}
+
+	inst->state = STATE_OFF;
+
+	/* Power-off the PHY and de-initialize it */
+	exynos5_usb3phy_isol(inst, 1);
+	exynos5_usb3phy_exit(inst);
+
+err0:
+	clk_disable_unprepare(drv->clk);
+	if (drv->sclk_usbphy30)
+		clk_disable_unprepare(drv->sclk_usbphy30);
+
+	return ret;
+}
+
+static struct phy_ops exynos5_usb3phy_ops = {
+	.power_on	= exynos5_usb3phy_power_on,
+	.power_off	= exynos5_usb3phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static const struct of_device_id exynos5_usb3phy_of_match[];
+
+static int exynos5_usb3phy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct usb3phy_driver *drv;
+	struct usb3phy_instance *inst;
+	struct phy_provider *phy_provider;
+	struct resource *res;
+	struct clk *clk;
+	const struct of_device_id *match;
+	const struct usb3phy_config *cfg;
+
+	match = of_match_node(exynos5_usb3phy_of_match, pdev->dev.of_node);
+	if (!match) {
+		dev_err(dev, "of_match_node() failed\n");
+		return -EINVAL;
+	}
+	cfg = match->data;
+	if (!cfg) {
+		dev_err(dev, "Failed to get configuration\n");
+		return -EINVAL;
+	}
+
+	drv = devm_kzalloc(dev, sizeof(struct usb3phy_driver), GFP_KERNEL);
+	if (!drv) {
+		dev_err(dev, "Failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	dev_set_drvdata(dev, drv);
+	drv->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	drv->reg_phy = devm_ioremap_resource(dev, res);
+	if (IS_ERR(drv->reg_phy)) {
+		dev_err(dev, "Failed to map register memory (phy)\n");
+		return PTR_ERR(drv->reg_phy);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	drv->reg_isol = devm_ioremap_resource(dev, res);
+	if (IS_ERR(drv->reg_isol)) {
+		dev_err(dev, "Failed to map register memory (isolation)\n");
+		return PTR_ERR(drv->reg_isol);
+	}
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	if (IS_ERR(phy_provider)) {
+		dev_err(drv->dev, "Failed to register phy provider\n");
+		return PTR_ERR(phy_provider);
+	}
+
+	drv->clk = devm_clk_get(dev, "phy");
+	if (IS_ERR(drv->clk)) {
+		dev_err(dev, "Failed to get clock of phy controller\n");
+		return PTR_ERR(drv->clk);
+	}
+
+	/*
+	 * Exysno5420 SoC has an additional special clock, used for
+	 * for USB 3.0 PHY operation, this clock goes to the PHY block
+	 * as a reference clock to clock generation block of the controller.
+	 */
+	if (cfg->has_sclk_usbphy30) {
+		drv->sclk_usbphy30 = devm_clk_get(dev, "sclk_usbphy30");
+		if (IS_ERR(drv->clk)) {
+			dev_err(dev, "Failed to get phy reference clock\n");
+			return PTR_ERR(drv->clk);
+		}
+	}
+
+	inst		= &drv->instance;
+	inst->drv	= drv;
+	inst->label	= "usb3drd";
+
+	dev_info(dev, "Creating phy \"%s\"\n", inst->label);
+	inst->phy = devm_phy_create(dev, &exynos5_usb3phy_ops, NULL);
+	if (IS_ERR(inst->phy)) {
+		dev_err(drv->dev, "Failed to create usb3phy \"%s\"\n",
+					inst->label);
+		return PTR_ERR(inst->phy);
+	}
+
+	phy_set_drvdata(inst->phy, inst);
+
+	clk = clk_get(dev, inst->label);
+	if (IS_ERR(clk)) {
+		dev_err(dev, "Failed to get clock of \"%s\" phy\n",
+							inst->label);
+		return PTR_ERR(clk);
+	}
+
+	inst->rate = clk_get_rate(clk);
+
+	inst->clk = exynos5_rate_to_clk(inst->rate);
+	if (inst->clk == CLKSEL_ERROR) {
+		dev_err(dev, "Clock rate (%ld) not supported\n",
+						inst->rate);
+		clk_put(clk);
+		return -EINVAL;
+	}
+	clk_put(clk);
+
+	return 0;
+}
+
+const struct usb3phy_config exynos5420_usb3phy_cfg = {
+	.cpu		   = TYPE_EXYNOS5420,
+	.has_sclk_usbphy30 = true,
+};
+
+const struct usb3phy_config exynos5250_usb3phy_cfg = {
+	.cpu		   = TYPE_EXYNOS5250,
+	.has_sclk_usbphy30 = false,
+};
+
+static const struct of_device_id exynos5_usb3phy_of_match[] = {
+	{
+		.compatible = "samsung,exynos5250-usb3phy",
+		.data = &exynos5250_usb3phy_cfg
+	}, {
+		.compatible = "samsung,exynos5420-usb3phy",
+		.data = &exynos5420_usb3phy_cfg
+	},
+	{ },
+};
+
+static struct platform_driver exynos5_usb3phy_driver = {
+	.probe	= exynos5_usb3phy_probe,
+	.driver = {
+		.of_match_table	= exynos5_usb3phy_of_match,
+		.name		= "exynos5-usb3phy",
+		.owner		= THIS_MODULE,
+	}
+};
+
+module_platform_driver(exynos5_usb3phy_driver);
+MODULE_DESCRIPTION("Samsung EXYNOS5 series SoC USB 3.0 PHY driver");
+MODULE_AUTHOR("Vivek Gautam <gautam.vivek@samsung.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:exynos5-usb3phy");
-- 
1.7.6.5

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