drivers/phy/ti/phy-omap-usb2.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * omap-usb2.c - USB PHY, talking to USB controller on TI SoCs.
  *
  * Copyright (C) 2012-2020 Texas Instruments Incorporated - http://www.ti.com
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/phy/omap_control_phy.h>
 #include <linux/phy/omap_usb.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/sys_soc.h>
 #include <linux/usb/phy_companion.h>

 #define USB2PHY_ANA_CONFIG1		0x4c
 #define USB2PHY_DISCON_BYP_LATCH	BIT(31)

 #define USB2PHY_CHRG_DET			0x14
 #define USB2PHY_CHRG_DET_USE_CHG_DET_REG	BIT(29)
 #define USB2PHY_CHRG_DET_DIS_CHG_DET		BIT(28)

 /* SoC Specific USB2_OTG register definitions */
 #define AM654_USB2_OTG_PD		BIT(8)
 #define AM654_USB2_VBUS_DET_EN		BIT(5)
 #define AM654_USB2_VBUSVALID_DET_EN	BIT(4)

 #define OMAP_DEV_PHY_PD		BIT(0)
 #define OMAP_USB2_PHY_PD	BIT(28)

 #define AM437X_USB2_PHY_PD		BIT(0)
 #define AM437X_USB2_OTG_PD		BIT(1)
 #define AM437X_USB2_OTGVDET_EN		BIT(19)
 #define AM437X_USB2_OTGSESSEND_EN	BIT(20)

 /* Driver Flags */
 #define OMAP_USB2_HAS_START_SRP			BIT(0)
 #define OMAP_USB2_HAS_SET_VBUS			BIT(1)
 #define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT	BIT(2)
 #define OMAP_USB2_DISABLE_CHRG_DET		BIT(3)

 struct omap_usb {
 	struct usb_phy		phy;
 	struct phy_companion	*comparator;
 	void __iomem		*pll_ctrl_base;
 	void __iomem		*phy_base;
 	struct device		*dev;
 	struct device		*control_dev;
 	struct clk		*wkupclk;
 	struct clk		*optclk;
 	u8			flags;
 	struct regmap		*syscon_phy_power; /* ctrl. reg. acces */
 	unsigned int		power_reg; /* power reg. index within syscon */
 	u32			mask;
 	u32			power_on;
 	u32			power_off;
 };

 #define	phy_to_omapusb(x)	container_of((x), struct omap_usb, phy)

 struct usb_phy_data {
 	const char *label;
 	u8 flags;
 	u32 mask;
 	u32 power_on;
 	u32 power_off;
 };

 static inline u32 omap_usb_readl(void __iomem *addr, unsigned int offset)
 {
 	return __raw_readl(addr + offset);
 }

 static inline void omap_usb_writel(void __iomem *addr, unsigned int offset,
 				   u32 data)
 {
 	__raw_writel(data, addr + offset);
 }

 /**
  * omap_usb2_set_comparator() - links the comparator present in the system with this phy
  *
  * @comparator:  the companion phy(comparator) for this phy
  *
  * The phy companion driver should call this API passing the phy_companion
  * filled with set_vbus and start_srp to be used by usb phy.
  *
  * For use by phy companion driver
  */
 int omap_usb2_set_comparator(struct phy_companion *comparator)
 {
 	struct omap_usb	*phy;
 	struct usb_phy	*x = usb_get_phy(USB_PHY_TYPE_USB2);

 	if (IS_ERR(x))
 		return -ENODEV;

 	phy = phy_to_omapusb(x);
 	phy->comparator = comparator;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);

 static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
 {
 	struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);

 	if (!phy->comparator)
 		return -ENODEV;

 	return phy->comparator->set_vbus(phy->comparator, enabled);
 }

 static int omap_usb_start_srp(struct usb_otg *otg)
 {
 	struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);

 	if (!phy->comparator)
 		return -ENODEV;

 	return phy->comparator->start_srp(phy->comparator);
 }

 static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 {
 	otg->host = host;
 	if (!host)
 		otg->state = OTG_STATE_UNDEFINED;

 	return 0;
 }

 static int omap_usb_set_peripheral(struct usb_otg *otg,
 				   struct usb_gadget *gadget)
 {
 	otg->gadget = gadget;
 	if (!gadget)
 		otg->state = OTG_STATE_UNDEFINED;

 	return 0;
 }

 static int omap_usb_phy_power(struct omap_usb *phy, int on)
 {
 	u32 val;
 	int ret;

 	if (!phy->syscon_phy_power) {
 		omap_control_phy_power(phy->control_dev, on);
 		return 0;
 	}

 	if (on)
 		val = phy->power_on;
 	else
 		val = phy->power_off;

 	ret = regmap_update_bits(phy->syscon_phy_power, phy->power_reg,
 				 phy->mask, val);
 	return ret;
 }

 static int omap_usb_power_off(struct phy *x)
 {
 	struct omap_usb *phy = phy_get_drvdata(x);

 	return omap_usb_phy_power(phy, false);
 }

 static int omap_usb_power_on(struct phy *x)
 {
 	struct omap_usb *phy = phy_get_drvdata(x);

 	return omap_usb_phy_power(phy, true);
 }

 static int omap_usb2_disable_clocks(struct omap_usb *phy)
 {
 	clk_disable_unprepare(phy->wkupclk);
 	if (!IS_ERR(phy->optclk))
 		clk_disable_unprepare(phy->optclk);

 	return 0;
 }

 static int omap_usb2_enable_clocks(struct omap_usb *phy)
 {
 	int ret;

 	ret = clk_prepare_enable(phy->wkupclk);
 	if (ret < 0) {
 		dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
 		goto err0;
 	}

 	if (!IS_ERR(phy->optclk)) {
 		ret = clk_prepare_enable(phy->optclk);
 		if (ret < 0) {
 			dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
 			goto err1;
 		}
 	}

 	return 0;

 err1:
 	clk_disable_unprepare(phy->wkupclk);

 err0:
 	return ret;
 }

 static int omap_usb_init(struct phy *x)
 {
 	struct omap_usb *phy = phy_get_drvdata(x);
 	u32 val;

 	omap_usb2_enable_clocks(phy);

 	if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 		/*
 		 *
 		 * Reduce the sensitivity of internal PHY by enabling the
 		 * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
 		 * resolves issues with certain devices which can otherwise
 		 * be prone to false disconnects.
 		 *
 		 */
 		val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
 		val |= USB2PHY_DISCON_BYP_LATCH;
 		omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
 	}

 	if (phy->flags & OMAP_USB2_DISABLE_CHRG_DET) {
 		val = omap_usb_readl(phy->phy_base, USB2PHY_CHRG_DET);
 		val |= USB2PHY_CHRG_DET_USE_CHG_DET_REG |
 		       USB2PHY_CHRG_DET_DIS_CHG_DET;
 		omap_usb_writel(phy->phy_base, USB2PHY_CHRG_DET, val);
 	}

 	return 0;
 }

 static int omap_usb_exit(struct phy *x)
 {
 	struct omap_usb *phy = phy_get_drvdata(x);

 	return omap_usb2_disable_clocks(phy);
 }

 static const struct phy_ops ops = {
 	.init		= omap_usb_init,
 	.exit		= omap_usb_exit,
 	.power_on	= omap_usb_power_on,
 	.power_off	= omap_usb_power_off,
 	.owner		= THIS_MODULE,
 };

 static const struct usb_phy_data omap_usb2_data = {
 	.label = "omap_usb2",
 	.flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
 	.mask = OMAP_DEV_PHY_PD,
 	.power_off = OMAP_DEV_PHY_PD,
 };

 static const struct usb_phy_data omap5_usb2_data = {
 	.label = "omap5_usb2",
 	.flags = 0,
 	.mask = OMAP_DEV_PHY_PD,
 	.power_off = OMAP_DEV_PHY_PD,
 };

 static const struct usb_phy_data dra7x_usb2_data = {
 	.label = "dra7x_usb2",
 	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 	.mask = OMAP_DEV_PHY_PD,
 	.power_off = OMAP_DEV_PHY_PD,
 };

 static const struct usb_phy_data dra7x_usb2_phy2_data = {
 	.label = "dra7x_usb2_phy2",
 	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 	.mask = OMAP_USB2_PHY_PD,
 	.power_off = OMAP_USB2_PHY_PD,
 };

 static const struct usb_phy_data am437x_usb2_data = {
 	.label = "am437x_usb2",
 	.flags =  0,
 	.mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
 		AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
 	.power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
 	.power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
 };

 static const struct usb_phy_data am654_usb2_data = {
 	.label = "am654_usb2",
 	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 	.mask = AM654_USB2_OTG_PD | AM654_USB2_VBUS_DET_EN |
 		AM654_USB2_VBUSVALID_DET_EN,
 	.power_on = AM654_USB2_VBUS_DET_EN | AM654_USB2_VBUSVALID_DET_EN,
 	.power_off = AM654_USB2_OTG_PD,
 };

 static const struct of_device_id omap_usb2_id_table[] = {
 	{
 		.compatible = "ti,omap-usb2",
 		.data = &omap_usb2_data,
 	},
 	{
 		.compatible = "ti,omap5-usb2",
 		.data = &omap5_usb2_data,
 	},
 	{
 		.compatible = "ti,dra7x-usb2",
 		.data = &dra7x_usb2_data,
 	},
 	{
 		.compatible = "ti,dra7x-usb2-phy2",
 		.data = &dra7x_usb2_phy2_data,
 	},
 	{
 		.compatible = "ti,am437x-usb2",
 		.data = &am437x_usb2_data,
 	},
 	{
 		.compatible = "ti,am654-usb2",
 		.data = &am654_usb2_data,
 	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);

 static void omap_usb2_init_errata(struct omap_usb *phy)
 {
 	static const struct soc_device_attribute am65x_sr10_soc_devices[] = {
 		{ .family = "AM65X", .revision = "SR1.0" },
 		{ /* sentinel */ }
 	};

 	/*
 	 * Errata i2075: USB2PHY: USB2PHY Charger Detect is Enabled by
 	 * Default Without VBUS Presence.
 	 *
 	 * AM654x SR1.0 has a silicon bug due to which D+ is pulled high after
 	 * POR, which could cause enumeration failure with some USB hubs.
 	 * Disabling the USB2_PHY Charger Detect function will put D+
 	 * into the normal state.
 	 */
 	if (soc_device_match(am65x_sr10_soc_devices))
 		phy->flags |= OMAP_USB2_DISABLE_CHRG_DET;
 }

 static int omap_usb2_probe(struct platform_device *pdev)
 {
 	struct omap_usb	*phy;
 	struct phy *generic_phy;
 	struct phy_provider *phy_provider;
 	struct usb_otg *otg;
 	struct device_node *node = pdev->dev.of_node;
 	struct device_node *control_node;
 	struct platform_device *control_pdev;
 	const struct of_device_id *of_id;
 	struct usb_phy_data *phy_data;

 	of_id = of_match_device(omap_usb2_id_table, &pdev->dev);

 	if (!of_id)
 		return -EINVAL;

 	phy_data = (struct usb_phy_data *)of_id->data;

 	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 	if (!phy)
 		return -ENOMEM;

 	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 	if (!otg)
 		return -ENOMEM;

 	phy->dev		= &pdev->dev;

 	phy->phy.dev		= phy->dev;
 	phy->phy.label		= phy_data->label;
 	phy->phy.otg		= otg;
 	phy->phy.type		= USB_PHY_TYPE_USB2;
 	phy->mask		= phy_data->mask;
 	phy->power_on		= phy_data->power_on;
 	phy->power_off		= phy_data->power_off;
 	phy->flags		= phy_data->flags;

 	omap_usb2_init_errata(phy);

 	phy->phy_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(phy->phy_base))
 		return PTR_ERR(phy->phy_base);

 	phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
 								"syscon-phy-power");
 	if (IS_ERR(phy->syscon_phy_power)) {
 		dev_dbg(&pdev->dev,
 			"can't get syscon-phy-power, using control device\n");
 		phy->syscon_phy_power = NULL;

 		control_node = of_parse_phandle(node, "ctrl-module", 0);
 		if (!control_node) {
 			dev_err(&pdev->dev,
 				"Failed to get control device phandle\n");
 			return -EINVAL;
 		}

 		control_pdev = of_find_device_by_node(control_node);
 		if (!control_pdev) {
 			dev_err(&pdev->dev, "Failed to get control device\n");
 			return -EINVAL;
 		}
 		phy->control_dev = &control_pdev->dev;
 	} else {
 		if (of_property_read_u32_index(node,
 					       "syscon-phy-power", 1,
 					       &phy->power_reg)) {
 			dev_err(&pdev->dev,
 				"couldn't get power reg. offset\n");
 			return -EINVAL;
 		}
 	}

 	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 	if (IS_ERR(phy->wkupclk)) {
 		if (PTR_ERR(phy->wkupclk) == -EPROBE_DEFER)
 			return -EPROBE_DEFER;

 		dev_warn(&pdev->dev, "unable to get wkupclk %ld, trying old name\n",
 			 PTR_ERR(phy->wkupclk));
 		phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");

 		if (IS_ERR(phy->wkupclk))
 			return dev_err_probe(&pdev->dev, PTR_ERR(phy->wkupclk),
 					     "unable to get usb_phy_cm_clk32k\n");

 		dev_warn(&pdev->dev,
 			 "found usb_phy_cm_clk32k, please fix DTS\n");
 	}

 	phy->optclk = devm_clk_get(phy->dev, "refclk");
 	if (IS_ERR(phy->optclk)) {
 		if (PTR_ERR(phy->optclk) == -EPROBE_DEFER)
 			return -EPROBE_DEFER;

 		dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
 		phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");

 		if (IS_ERR(phy->optclk)) {
 			if (PTR_ERR(phy->optclk) != -EPROBE_DEFER) {
 				dev_dbg(&pdev->dev,
 					"unable to get usb_otg_ss_refclk960m\n");
 			}
 		} else {
 			dev_warn(&pdev->dev,
 				 "found usb_otg_ss_refclk960m, please fix DTS\n");
 		}
 	}

 	otg->set_host = omap_usb_set_host;
 	otg->set_peripheral = omap_usb_set_peripheral;
 	if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
 		otg->set_vbus = omap_usb_set_vbus;
 	if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
 		otg->start_srp = omap_usb_start_srp;
 	otg->usb_phy = &phy->phy;

 	platform_set_drvdata(pdev, phy);
 	pm_runtime_enable(phy->dev);

 	generic_phy = devm_phy_create(phy->dev, NULL, &ops);
 	if (IS_ERR(generic_phy)) {
 		pm_runtime_disable(phy->dev);
 		return PTR_ERR(generic_phy);
 	}

 	phy_set_drvdata(generic_phy, phy);
 	omap_usb_power_off(generic_phy);

 	phy_provider = devm_of_phy_provider_register(phy->dev,
 						     of_phy_simple_xlate);
 	if (IS_ERR(phy_provider)) {
 		pm_runtime_disable(phy->dev);
 		return PTR_ERR(phy_provider);
 	}

 	usb_add_phy_dev(&phy->phy);

 	return 0;
 }

 static void omap_usb2_remove(struct platform_device *pdev)
 {
 	struct omap_usb	*phy = platform_get_drvdata(pdev);

 	usb_remove_phy(&phy->phy);
 	pm_runtime_disable(phy->dev);
 }

 static struct platform_driver omap_usb2_driver = {
 	.probe		= omap_usb2_probe,
 	.remove_new	= omap_usb2_remove,
 	.driver		= {
 		.name	= "omap-usb2",
 		.of_match_table = omap_usb2_id_table,
 	},
 };

 module_platform_driver(omap_usb2_driver);

 MODULE_ALIAS("platform:omap_usb2");
 MODULE_AUTHOR("Texas Instruments Inc.");
 MODULE_DESCRIPTION("OMAP USB2 phy driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* omap-usb2.c - USB PHY, talking to USB controller on TI SoCs.
	*
	* Copyright (C) 2012-2020 Texas Instruments Incorporated - http://www.ti.com
	* Author: Kishon Vijay Abraham I <kishon@ti.com>
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/mfd/syscon.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/phy/omap_control_phy.h>
	#include <linux/phy/omap_usb.h>
	#include <linux/phy/phy.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>
	#include <linux/sys_soc.h>
	#include <linux/usb/phy_companion.h>

	#define USB2PHY_ANA_CONFIG1 0x4c
	#define USB2PHY_DISCON_BYP_LATCH BIT(31)

	#define USB2PHY_CHRG_DET 0x14
	#define USB2PHY_CHRG_DET_USE_CHG_DET_REG BIT(29)
	#define USB2PHY_CHRG_DET_DIS_CHG_DET BIT(28)

	/* SoC Specific USB2_OTG register definitions */
	#define AM654_USB2_OTG_PD BIT(8)
	#define AM654_USB2_VBUS_DET_EN BIT(5)
	#define AM654_USB2_VBUSVALID_DET_EN BIT(4)

	#define OMAP_DEV_PHY_PD BIT(0)
	#define OMAP_USB2_PHY_PD BIT(28)

	#define AM437X_USB2_PHY_PD BIT(0)
	#define AM437X_USB2_OTG_PD BIT(1)
	#define AM437X_USB2_OTGVDET_EN BIT(19)
	#define AM437X_USB2_OTGSESSEND_EN BIT(20)

	/* Driver Flags */
	#define OMAP_USB2_HAS_START_SRP BIT(0)
	#define OMAP_USB2_HAS_SET_VBUS BIT(1)
	#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT BIT(2)
	#define OMAP_USB2_DISABLE_CHRG_DET BIT(3)

	struct omap_usb {
	struct usb_phy phy;
	struct phy_companion *comparator;
	void __iomem *pll_ctrl_base;
	void __iomem *phy_base;
	struct device *dev;
	struct device *control_dev;
	struct clk *wkupclk;
	struct clk *optclk;
	u8 flags;
	struct regmap syscon_phy_power; / ctrl. reg. acces */
	unsigned int power_reg; /* power reg. index within syscon */
	u32 mask;
	u32 power_on;
	u32 power_off;
	};

	#define phy_to_omapusb(x) container_of((x), struct omap_usb, phy)

	struct usb_phy_data {
	const char *label;
	u8 flags;
	u32 mask;
	u32 power_on;
	u32 power_off;
	};

	static inline u32 omap_usb_readl(void __iomem *addr, unsigned int offset)
	{
	return __raw_readl(addr + offset);
	}

	static inline void omap_usb_writel(void __iomem *addr, unsigned int offset,
	u32 data)
	{
	__raw_writel(data, addr + offset);
	}

	/**
	* omap_usb2_set_comparator() - links the comparator present in the system with this phy
	*
	* @comparator: the companion phy(comparator) for this phy
	*
	* The phy companion driver should call this API passing the phy_companion
	* filled with set_vbus and start_srp to be used by usb phy.
	*
	* For use by phy companion driver
	*/
	int omap_usb2_set_comparator(struct phy_companion *comparator)
	{
	struct omap_usb *phy;
	struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2);

	if (IS_ERR(x))
	return -ENODEV;

	phy = phy_to_omapusb(x);
	phy->comparator = comparator;
	return 0;
	}
	EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);

	static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
	{
	struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);

	if (!phy->comparator)
	return -ENODEV;

	return phy->comparator->set_vbus(phy->comparator, enabled);
	}

	static int omap_usb_start_srp(struct usb_otg *otg)
	{
	struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);

	if (!phy->comparator)
	return -ENODEV;

	return phy->comparator->start_srp(phy->comparator);
	}

	static int omap_usb_set_host(struct usb_otg otg, struct usb_bus host)
	{
	otg->host = host;
	if (!host)
	otg->state = OTG_STATE_UNDEFINED;

	return 0;
	}

	static int omap_usb_set_peripheral(struct usb_otg *otg,
	struct usb_gadget *gadget)
	{
	otg->gadget = gadget;
	if (!gadget)
	otg->state = OTG_STATE_UNDEFINED;

	return 0;
	}

	static int omap_usb_phy_power(struct omap_usb *phy, int on)
	{
	u32 val;
	int ret;

	if (!phy->syscon_phy_power) {
	omap_control_phy_power(phy->control_dev, on);
	return 0;
	}

	if (on)
	val = phy->power_on;
	else
	val = phy->power_off;

	ret = regmap_update_bits(phy->syscon_phy_power, phy->power_reg,
	phy->mask, val);
	return ret;
	}

	static int omap_usb_power_off(struct phy *x)
	{
	struct omap_usb *phy = phy_get_drvdata(x);

	return omap_usb_phy_power(phy, false);
	}

	static int omap_usb_power_on(struct phy *x)
	{
	struct omap_usb *phy = phy_get_drvdata(x);

	return omap_usb_phy_power(phy, true);
	}

	static int omap_usb2_disable_clocks(struct omap_usb *phy)
	{
	clk_disable_unprepare(phy->wkupclk);
	if (!IS_ERR(phy->optclk))
	clk_disable_unprepare(phy->optclk);

	return 0;
	}

	static int omap_usb2_enable_clocks(struct omap_usb *phy)
	{
	int ret;

	ret = clk_prepare_enable(phy->wkupclk);
	if (ret < 0) {
	dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
	goto err0;
	}

	if (!IS_ERR(phy->optclk)) {
	ret = clk_prepare_enable(phy->optclk);
	if (ret < 0) {
	dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
	goto err1;
	}
	}

	return 0;

	err1:
	clk_disable_unprepare(phy->wkupclk);

	err0:
	return ret;
	}

	static int omap_usb_init(struct phy *x)
	{
	struct omap_usb *phy = phy_get_drvdata(x);
	u32 val;

	omap_usb2_enable_clocks(phy);

	if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
	/*
	*
	* Reduce the sensitivity of internal PHY by enabling the
	* DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
	* resolves issues with certain devices which can otherwise
	* be prone to false disconnects.
	*
	*/
	val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
	val \|= USB2PHY_DISCON_BYP_LATCH;
	omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
	}

	if (phy->flags & OMAP_USB2_DISABLE_CHRG_DET) {
	val = omap_usb_readl(phy->phy_base, USB2PHY_CHRG_DET);
	val \|= USB2PHY_CHRG_DET_USE_CHG_DET_REG \|
	USB2PHY_CHRG_DET_DIS_CHG_DET;
	omap_usb_writel(phy->phy_base, USB2PHY_CHRG_DET, val);
	}

	return 0;
	}

	static int omap_usb_exit(struct phy *x)
	{
	struct omap_usb *phy = phy_get_drvdata(x);

	return omap_usb2_disable_clocks(phy);
	}

	static const struct phy_ops ops = {
	.init = omap_usb_init,
	.exit = omap_usb_exit,
	.power_on = omap_usb_power_on,
	.power_off = omap_usb_power_off,
	.owner = THIS_MODULE,
	};

	static const struct usb_phy_data omap_usb2_data = {
	.label = "omap_usb2",
	.flags = OMAP_USB2_HAS_START_SRP \| OMAP_USB2_HAS_SET_VBUS,
	.mask = OMAP_DEV_PHY_PD,
	.power_off = OMAP_DEV_PHY_PD,
	};

	static const struct usb_phy_data omap5_usb2_data = {
	.label = "omap5_usb2",
	.flags = 0,
	.mask = OMAP_DEV_PHY_PD,
	.power_off = OMAP_DEV_PHY_PD,
	};

	static const struct usb_phy_data dra7x_usb2_data = {
	.label = "dra7x_usb2",
	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	.mask = OMAP_DEV_PHY_PD,
	.power_off = OMAP_DEV_PHY_PD,
	};

	static const struct usb_phy_data dra7x_usb2_phy2_data = {
	.label = "dra7x_usb2_phy2",
	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	.mask = OMAP_USB2_PHY_PD,
	.power_off = OMAP_USB2_PHY_PD,
	};

	static const struct usb_phy_data am437x_usb2_data = {
	.label = "am437x_usb2",
	.flags = 0,
	.mask = AM437X_USB2_PHY_PD \| AM437X_USB2_OTG_PD \|
	AM437X_USB2_OTGVDET_EN \| AM437X_USB2_OTGSESSEND_EN,
	.power_on = AM437X_USB2_OTGVDET_EN \| AM437X_USB2_OTGSESSEND_EN,
	.power_off = AM437X_USB2_PHY_PD \| AM437X_USB2_OTG_PD,
	};

	static const struct usb_phy_data am654_usb2_data = {
	.label = "am654_usb2",
	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
	.mask = AM654_USB2_OTG_PD \| AM654_USB2_VBUS_DET_EN \|
	AM654_USB2_VBUSVALID_DET_EN,
	.power_on = AM654_USB2_VBUS_DET_EN \| AM654_USB2_VBUSVALID_DET_EN,
	.power_off = AM654_USB2_OTG_PD,
	};

	static const struct of_device_id omap_usb2_id_table[] = {
	{
	.compatible = "ti,omap-usb2",
	.data = &omap_usb2_data,
	},
	{
	.compatible = "ti,omap5-usb2",
	.data = &omap5_usb2_data,
	},
	{
	.compatible = "ti,dra7x-usb2",
	.data = &dra7x_usb2_data,
	},
	{
	.compatible = "ti,dra7x-usb2-phy2",
	.data = &dra7x_usb2_phy2_data,
	},
	{
	.compatible = "ti,am437x-usb2",
	.data = &am437x_usb2_data,
	},
	{
	.compatible = "ti,am654-usb2",
	.data = &am654_usb2_data,
	},
	{},
	};
	MODULE_DEVICE_TABLE(of, omap_usb2_id_table);

	static void omap_usb2_init_errata(struct omap_usb *phy)
	{
	static const struct soc_device_attribute am65x_sr10_soc_devices[] = {
	{ .family = "AM65X", .revision = "SR1.0" },
	{ /* sentinel */ }
	};

	/*
	* Errata i2075: USB2PHY: USB2PHY Charger Detect is Enabled by
	* Default Without VBUS Presence.
	*
	* AM654x SR1.0 has a silicon bug due to which D+ is pulled high after
	* POR, which could cause enumeration failure with some USB hubs.
	* Disabling the USB2_PHY Charger Detect function will put D+
	* into the normal state.
	*/
	if (soc_device_match(am65x_sr10_soc_devices))
	phy->flags \|= OMAP_USB2_DISABLE_CHRG_DET;
	}

	static int omap_usb2_probe(struct platform_device *pdev)
	{
	struct omap_usb *phy;
	struct phy *generic_phy;
	struct phy_provider *phy_provider;
	struct usb_otg *otg;
	struct device_node *node = pdev->dev.of_node;
	struct device_node *control_node;
	struct platform_device *control_pdev;
	const struct of_device_id *of_id;
	struct usb_phy_data *phy_data;

	of_id = of_match_device(omap_usb2_id_table, &pdev->dev);

	if (!of_id)
	return -EINVAL;

	phy_data = (struct usb_phy_data *)of_id->data;

	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
	if (!phy)
	return -ENOMEM;

	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
	if (!otg)
	return -ENOMEM;

	phy->dev = &pdev->dev;

	phy->phy.dev = phy->dev;
	phy->phy.label = phy_data->label;
	phy->phy.otg = otg;
	phy->phy.type = USB_PHY_TYPE_USB2;
	phy->mask = phy_data->mask;
	phy->power_on = phy_data->power_on;
	phy->power_off = phy_data->power_off;
	phy->flags = phy_data->flags;

	omap_usb2_init_errata(phy);

	phy->phy_base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(phy->phy_base))
	return PTR_ERR(phy->phy_base);

	phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
	"syscon-phy-power");
	if (IS_ERR(phy->syscon_phy_power)) {
	dev_dbg(&pdev->dev,
	"can't get syscon-phy-power, using control device\n");
	phy->syscon_phy_power = NULL;

	control_node = of_parse_phandle(node, "ctrl-module", 0);
	if (!control_node) {
	dev_err(&pdev->dev,
	"Failed to get control device phandle\n");
	return -EINVAL;
	}

	control_pdev = of_find_device_by_node(control_node);
	if (!control_pdev) {
	dev_err(&pdev->dev, "Failed to get control device\n");
	return -EINVAL;
	}
	phy->control_dev = &control_pdev->dev;
	} else {
	if (of_property_read_u32_index(node,
	"syscon-phy-power", 1,
	&phy->power_reg)) {
	dev_err(&pdev->dev,
	"couldn't get power reg. offset\n");
	return -EINVAL;
	}
	}

	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
	if (IS_ERR(phy->wkupclk)) {
	if (PTR_ERR(phy->wkupclk) == -EPROBE_DEFER)
	return -EPROBE_DEFER;

	dev_warn(&pdev->dev, "unable to get wkupclk %ld, trying old name\n",
	PTR_ERR(phy->wkupclk));
	phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");

	if (IS_ERR(phy->wkupclk))
	return dev_err_probe(&pdev->dev, PTR_ERR(phy->wkupclk),
	"unable to get usb_phy_cm_clk32k\n");

	dev_warn(&pdev->dev,
	"found usb_phy_cm_clk32k, please fix DTS\n");
	}

	phy->optclk = devm_clk_get(phy->dev, "refclk");
	if (IS_ERR(phy->optclk)) {
	if (PTR_ERR(phy->optclk) == -EPROBE_DEFER)
	return -EPROBE_DEFER;

	dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
	phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");

	if (IS_ERR(phy->optclk)) {
	if (PTR_ERR(phy->optclk) != -EPROBE_DEFER) {
	dev_dbg(&pdev->dev,
	"unable to get usb_otg_ss_refclk960m\n");
	}
	} else {
	dev_warn(&pdev->dev,
	"found usb_otg_ss_refclk960m, please fix DTS\n");
	}
	}

	otg->set_host = omap_usb_set_host;
	otg->set_peripheral = omap_usb_set_peripheral;
	if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
	otg->set_vbus = omap_usb_set_vbus;
	if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
	otg->start_srp = omap_usb_start_srp;
	otg->usb_phy = &phy->phy;

	platform_set_drvdata(pdev, phy);
	pm_runtime_enable(phy->dev);

	generic_phy = devm_phy_create(phy->dev, NULL, &ops);
	if (IS_ERR(generic_phy)) {
	pm_runtime_disable(phy->dev);
	return PTR_ERR(generic_phy);
	}

	phy_set_drvdata(generic_phy, phy);
	omap_usb_power_off(generic_phy);

	phy_provider = devm_of_phy_provider_register(phy->dev,
	of_phy_simple_xlate);
	if (IS_ERR(phy_provider)) {
	pm_runtime_disable(phy->dev);
	return PTR_ERR(phy_provider);
	}

	usb_add_phy_dev(&phy->phy);

	return 0;
	}

	static void omap_usb2_remove(struct platform_device *pdev)
	{
	struct omap_usb *phy = platform_get_drvdata(pdev);

	usb_remove_phy(&phy->phy);
	pm_runtime_disable(phy->dev);
	}

	static struct platform_driver omap_usb2_driver = {
	.probe = omap_usb2_probe,
	.remove_new = omap_usb2_remove,
	.driver = {
	.name = "omap-usb2",
	.of_match_table = omap_usb2_id_table,
	},
	};

	module_platform_driver(omap_usb2_driver);

	MODULE_ALIAS("platform:omap_usb2");
	MODULE_AUTHOR("Texas Instruments Inc.");
	MODULE_DESCRIPTION("OMAP USB2 phy driver");
	MODULE_LICENSE("GPL v2");