drivers/phy/phy-omap-usb2.c - kernel/msm-4.9 - Gitiles

 /*
  * omap-usb2.c - USB PHY, talking to musb controller in OMAP.
  *
  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
  * 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, or
  * (at your option) any later version.
  *
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  *
  * 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/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/io.h>
 #include <linux/phy/omap_usb.h>
 #include <linux/usb/phy_companion.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/pm_runtime.h>
 #include <linux/delay.h>
 #include <linux/phy/omap_control_phy.h>
 #include <linux/phy/phy.h>
 #include <linux/of_platform.h>

 #define USB2PHY_DISCON_BYP_LATCH (1 << 31)
 #define USB2PHY_ANA_CONFIG1 0x4c

 /**
  * omap_usb2_set_comparator - links the comparator present in the sytem 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->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->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)
 {
 	struct usb_phy	*phy = otg->phy;

 	otg->host = host;
 	if (!host)
 		phy->state = OTG_STATE_UNDEFINED;

 	return 0;
 }

 static int omap_usb_set_peripheral(struct usb_otg *otg,
 		struct usb_gadget *gadget)
 {
 	struct usb_phy	*phy = otg->phy;

 	otg->gadget = gadget;
 	if (!gadget)
 		phy->state = OTG_STATE_UNDEFINED;

 	return 0;
 }

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

 	omap_control_phy_power(phy->control_dev, 0);

 	return 0;
 }

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

 	omap_control_phy_power(phy->control_dev, 1);

 	return 0;
 }

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

 	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);
 	}

 	return 0;
 }

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

 #ifdef CONFIG_OF
 static const struct usb_phy_data omap_usb2_data = {
 	.label = "omap_usb2",
 	.flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
 };

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

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

 static const struct usb_phy_data am437x_usb2_data = {
 	.label = "am437x_usb2",
 	.flags =  0,
 };

 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,am437x-usb2",
 		.data = &am437x_usb2_data,
 	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
 #endif

 static int omap_usb2_probe(struct platform_device *pdev)
 {
 	struct omap_usb	*phy;
 	struct phy *generic_phy;
 	struct resource *res;
 	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(of_match_ptr(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) {
 		dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
 		return -ENOMEM;
 	}

 	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 	if (!otg) {
 		dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
 		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;

 	if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 		phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
 		if (IS_ERR(phy->phy_base))
 			return PTR_ERR(phy->phy_base);
 		phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
 	}

 	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;
 	omap_control_phy_power(phy->control_dev, 0);

 	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->phy		= &phy->phy;

 	platform_set_drvdata(pdev, phy);

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

 	phy_set_drvdata(generic_phy, phy);

 	pm_runtime_enable(phy->dev);
 	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);
 	}

 	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 	if (IS_ERR(phy->wkupclk)) {
 		dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
 		phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
 		if (IS_ERR(phy->wkupclk)) {
 			dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
 			return PTR_ERR(phy->wkupclk);
 		} else {
 			dev_warn(&pdev->dev,
 				 "found usb_phy_cm_clk32k, please fix DTS\n");
 		}
 	}
 	clk_prepare(phy->wkupclk);

 	phy->optclk = devm_clk_get(phy->dev, "refclk");
 	if (IS_ERR(phy->optclk)) {
 		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)) {
 			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");
 		}
 	} else {
 		clk_prepare(phy->optclk);
 	}

 	usb_add_phy_dev(&phy->phy);

 	return 0;
 }

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

 	clk_unprepare(phy->wkupclk);
 	if (!IS_ERR(phy->optclk))
 		clk_unprepare(phy->optclk);
 	usb_remove_phy(&phy->phy);
 	pm_runtime_disable(phy->dev);

 	return 0;
 }

 #ifdef CONFIG_PM_RUNTIME

 static int omap_usb2_runtime_suspend(struct device *dev)
 {
 	struct platform_device	*pdev = to_platform_device(dev);
 	struct omap_usb	*phy = platform_get_drvdata(pdev);

 	clk_disable(phy->wkupclk);
 	if (!IS_ERR(phy->optclk))
 		clk_disable(phy->optclk);

 	return 0;
 }

 static int omap_usb2_runtime_resume(struct device *dev)
 {
 	struct platform_device	*pdev = to_platform_device(dev);
 	struct omap_usb	*phy = platform_get_drvdata(pdev);
 	int ret;

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

 	return 0;

 err1:
 	clk_disable(phy->wkupclk);

 err0:
 	return ret;
 }

 static const struct dev_pm_ops omap_usb2_pm_ops = {
 	SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
 		NULL)
 };

 #define DEV_PM_OPS     (&omap_usb2_pm_ops)
 #else
 #define DEV_PM_OPS     NULL
 #endif

 static struct platform_driver omap_usb2_driver = {
 	.probe		= omap_usb2_probe,
 	.remove		= omap_usb2_remove,
 	.driver		= {
 		.name	= "omap-usb2",
 		.owner	= THIS_MODULE,
 		.pm	= DEV_PM_OPS,
 		.of_match_table = of_match_ptr(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");
	/*
	* omap-usb2.c - USB PHY, talking to musb controller in OMAP.
	*
	* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
	* 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, or
	* (at your option) any later version.
	*
	* Author: Kishon Vijay Abraham I <kishon@ti.com>
	*
	* 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/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/io.h>
	#include <linux/phy/omap_usb.h>
	#include <linux/usb/phy_companion.h>
	#include <linux/clk.h>
	#include <linux/err.h>
	#include <linux/pm_runtime.h>
	#include <linux/delay.h>
	#include <linux/phy/omap_control_phy.h>
	#include <linux/phy/phy.h>
	#include <linux/of_platform.h>

	#define USB2PHY_DISCON_BYP_LATCH (1 << 31)
	#define USB2PHY_ANA_CONFIG1 0x4c

	/**
	* omap_usb2_set_comparator - links the comparator present in the sytem 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->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->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)
	{
	struct usb_phy *phy = otg->phy;

	otg->host = host;
	if (!host)
	phy->state = OTG_STATE_UNDEFINED;

	return 0;
	}

	static int omap_usb_set_peripheral(struct usb_otg *otg,
	struct usb_gadget *gadget)
	{
	struct usb_phy *phy = otg->phy;

	otg->gadget = gadget;
	if (!gadget)
	phy->state = OTG_STATE_UNDEFINED;

	return 0;
	}

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

	omap_control_phy_power(phy->control_dev, 0);

	return 0;
	}

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

	omap_control_phy_power(phy->control_dev, 1);

	return 0;
	}

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

	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);
	}

	return 0;
	}

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

	#ifdef CONFIG_OF
	static const struct usb_phy_data omap_usb2_data = {
	.label = "omap_usb2",
	.flags = OMAP_USB2_HAS_START_SRP \| OMAP_USB2_HAS_SET_VBUS,
	};

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

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

	static const struct usb_phy_data am437x_usb2_data = {
	.label = "am437x_usb2",
	.flags = 0,
	};

	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,am437x-usb2",
	.data = &am437x_usb2_data,
	},
	{},
	};
	MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
	#endif

	static int omap_usb2_probe(struct platform_device *pdev)
	{
	struct omap_usb *phy;
	struct phy *generic_phy;
	struct resource *res;
	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(of_match_ptr(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) {
	dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
	return -ENOMEM;
	}

	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
	if (!otg) {
	dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
	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;

	if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(phy->phy_base))
	return PTR_ERR(phy->phy_base);
	phy->flags \|= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
	}

	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;
	omap_control_phy_power(phy->control_dev, 0);

	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->phy = &phy->phy;

	platform_set_drvdata(pdev, phy);

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

	phy_set_drvdata(generic_phy, phy);

	pm_runtime_enable(phy->dev);
	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);
	}

	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
	if (IS_ERR(phy->wkupclk)) {
	dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
	phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
	if (IS_ERR(phy->wkupclk)) {
	dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
	return PTR_ERR(phy->wkupclk);
	} else {
	dev_warn(&pdev->dev,
	"found usb_phy_cm_clk32k, please fix DTS\n");
	}
	}
	clk_prepare(phy->wkupclk);

	phy->optclk = devm_clk_get(phy->dev, "refclk");
	if (IS_ERR(phy->optclk)) {
	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)) {
	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");
	}
	} else {
	clk_prepare(phy->optclk);
	}

	usb_add_phy_dev(&phy->phy);

	return 0;
	}

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

	clk_unprepare(phy->wkupclk);
	if (!IS_ERR(phy->optclk))
	clk_unprepare(phy->optclk);
	usb_remove_phy(&phy->phy);
	pm_runtime_disable(phy->dev);

	return 0;
	}

	#ifdef CONFIG_PM_RUNTIME

	static int omap_usb2_runtime_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_usb *phy = platform_get_drvdata(pdev);

	clk_disable(phy->wkupclk);
	if (!IS_ERR(phy->optclk))
	clk_disable(phy->optclk);

	return 0;
	}

	static int omap_usb2_runtime_resume(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_usb *phy = platform_get_drvdata(pdev);
	int ret;

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

	return 0;

	err1:
	clk_disable(phy->wkupclk);

	err0:
	return ret;
	}

	static const struct dev_pm_ops omap_usb2_pm_ops = {
	SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
	NULL)
	};

	#define DEV_PM_OPS (&omap_usb2_pm_ops)
	#else
	#define DEV_PM_OPS NULL
	#endif

	static struct platform_driver omap_usb2_driver = {
	.probe = omap_usb2_probe,
	.remove = omap_usb2_remove,
	.driver = {
	.name = "omap-usb2",
	.owner = THIS_MODULE,
	.pm = DEV_PM_OPS,
	.of_match_table = of_match_ptr(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");