drivers/usb/dwc3/dwc3-imx8mp.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * dwc3-imx8mp.c - NXP imx8mp Specific Glue layer
  *
  * Copyright (c) 2020 NXP.
  */

 #include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>

 #include "core.h"

 /* USB wakeup registers */
 #define USB_WAKEUP_CTRL			0x00

 /* Global wakeup interrupt enable, also used to clear interrupt */
 #define USB_WAKEUP_EN			BIT(31)
 /* Wakeup from connect or disconnect, only for superspeed */
 #define USB_WAKEUP_SS_CONN		BIT(5)
 /* 0 select vbus_valid, 1 select sessvld */
 #define USB_WAKEUP_VBUS_SRC_SESS_VAL	BIT(4)
 /* Enable signal for wake up from u3 state */
 #define USB_WAKEUP_U3_EN		BIT(3)
 /* Enable signal for wake up from id change */
 #define USB_WAKEUP_ID_EN		BIT(2)
 /* Enable signal for wake up from vbus change */
 #define	USB_WAKEUP_VBUS_EN		BIT(1)
 /* Enable signal for wake up from dp/dm change */
 #define USB_WAKEUP_DPDM_EN		BIT(0)

 #define USB_WAKEUP_EN_MASK		GENMASK(5, 0)

 /* USB glue registers */
 #define USB_CTRL0		0x00
 #define USB_CTRL1		0x04

 #define USB_CTRL0_PORTPWR_EN	BIT(12) /* 1 - PPC enabled (default) */
 #define USB_CTRL0_USB3_FIXED	BIT(22) /* 1 - USB3 permanent attached */
 #define USB_CTRL0_USB2_FIXED	BIT(23) /* 1 - USB2 permanent attached */

 #define USB_CTRL1_OC_POLARITY	BIT(16) /* 0 - HIGH / 1 - LOW */
 #define USB_CTRL1_PWR_POLARITY	BIT(17) /* 0 - HIGH / 1 - LOW */

 struct dwc3_imx8mp {
 	struct device			*dev;
 	struct platform_device		*dwc3;
 	void __iomem			*hsio_blk_base;
 	void __iomem			*glue_base;
 	struct clk			*hsio_clk;
 	struct clk			*suspend_clk;
 	int				irq;
 	bool				pm_suspended;
 	bool				wakeup_pending;
 };

 static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)
 {
 	struct device *dev = dwc3_imx->dev;
 	u32 value;

 	if (!dwc3_imx->glue_base)
 		return;

 	value = readl(dwc3_imx->glue_base + USB_CTRL0);

 	if (device_property_read_bool(dev, "fsl,permanently-attached"))
 		value |= (USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
 	else
 		value &= ~(USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);

 	if (device_property_read_bool(dev, "fsl,disable-port-power-control"))
 		value &= ~(USB_CTRL0_PORTPWR_EN);
 	else
 		value |= USB_CTRL0_PORTPWR_EN;

 	writel(value, dwc3_imx->glue_base + USB_CTRL0);

 	value = readl(dwc3_imx->glue_base + USB_CTRL1);
 	if (device_property_read_bool(dev, "fsl,over-current-active-low"))
 		value |= USB_CTRL1_OC_POLARITY;
 	else
 		value &= ~USB_CTRL1_OC_POLARITY;

 	if (device_property_read_bool(dev, "fsl,power-active-low"))
 		value |= USB_CTRL1_PWR_POLARITY;
 	else
 		value &= ~USB_CTRL1_PWR_POLARITY;

 	writel(value, dwc3_imx->glue_base + USB_CTRL1);
 }

 static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx,
 				      pm_message_t msg)
 {
 	struct dwc3	*dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
 	u32		val;

 	if (!dwc3)
 		return;

 	val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);

 	if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci) {
 		val |= USB_WAKEUP_EN | USB_WAKEUP_DPDM_EN;
 		if (PMSG_IS_AUTO(msg))
 			val |= USB_WAKEUP_SS_CONN | USB_WAKEUP_U3_EN;
 	} else {
 		val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN |
 		       USB_WAKEUP_VBUS_SRC_SESS_VAL;
 	}

 	writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 }

 static void dwc3_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc3_imx)
 {
 	u32 val;

 	val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 	val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK);
 	writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 }

 static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx)
 {
 	struct dwc3_imx8mp	*dwc3_imx = _dwc3_imx;
 	struct dwc3		*dwc = platform_get_drvdata(dwc3_imx->dwc3);

 	if (!dwc3_imx->pm_suspended)
 		return IRQ_HANDLED;

 	disable_irq_nosync(dwc3_imx->irq);
 	dwc3_imx->wakeup_pending = true;

 	if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci)
 		pm_runtime_resume(&dwc->xhci->dev);
 	else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
 		pm_runtime_get(dwc->dev);

 	return IRQ_HANDLED;
 }

 static int dwc3_imx8mp_set_software_node(struct device *dev)
 {
 	struct property_entry props[3] = { 0 };
 	int prop_idx = 0;

 	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-missing-cas-quirk");
 	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-skip-phy-init-quirk");

 	return device_create_managed_software_node(dev, props, NULL);
 }

 static int dwc3_imx8mp_probe(struct platform_device *pdev)
 {
 	struct device		*dev = &pdev->dev;
 	struct device_node	*node = dev->of_node;
 	struct dwc3_imx8mp	*dwc3_imx;
 	struct resource		*res;
 	int			err, irq;

 	if (!node) {
 		dev_err(dev, "device node not found\n");
 		return -EINVAL;
 	}

 	dwc3_imx = devm_kzalloc(dev, sizeof(*dwc3_imx), GFP_KERNEL);
 	if (!dwc3_imx)
 		return -ENOMEM;

 	platform_set_drvdata(pdev, dwc3_imx);

 	dwc3_imx->dev = dev;

 	dwc3_imx->hsio_blk_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(dwc3_imx->hsio_blk_base))
 		return PTR_ERR(dwc3_imx->hsio_blk_base);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	if (!res) {
 		dev_warn(dev, "Base address for glue layer missing. Continuing without, some features are missing though.");
 	} else {
 		dwc3_imx->glue_base = devm_ioremap_resource(dev, res);
 		if (IS_ERR(dwc3_imx->glue_base))
 			return PTR_ERR(dwc3_imx->glue_base);
 	}

 	dwc3_imx->hsio_clk = devm_clk_get_enabled(dev, "hsio");
 	if (IS_ERR(dwc3_imx->hsio_clk))
 		return dev_err_probe(dev, PTR_ERR(dwc3_imx->hsio_clk),
 				     "Failed to get hsio clk\n");

 	dwc3_imx->suspend_clk = devm_clk_get_enabled(dev, "suspend");
 	if (IS_ERR(dwc3_imx->suspend_clk))
 		return dev_err_probe(dev, PTR_ERR(dwc3_imx->suspend_clk),
 				     "Failed to get suspend clk\n");

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;
 	dwc3_imx->irq = irq;

 	struct device_node *dwc3_np __free(device_node) = of_get_compatible_child(node,
 										  "snps,dwc3");
 	if (!dwc3_np)
 		return dev_err_probe(dev, -ENODEV, "failed to find dwc3 core child\n");

 	imx8mp_configure_glue(dwc3_imx);

 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
 	err = pm_runtime_get_sync(dev);
 	if (err < 0)
 		goto disable_rpm;

 	err = dwc3_imx8mp_set_software_node(dev);
 	if (err) {
 		err = -ENODEV;
 		dev_err(dev, "failed to create software node\n");
 		goto disable_rpm;
 	}

 	err = of_platform_populate(node, NULL, NULL, dev);
 	if (err) {
 		dev_err(&pdev->dev, "failed to create dwc3 core\n");
 		goto disable_rpm;
 	}

 	dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np);
 	if (!dwc3_imx->dwc3) {
 		dev_err(dev, "failed to get dwc3 platform device\n");
 		err = -ENODEV;
 		goto depopulate;
 	}

 	err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt,
 					IRQF_ONESHOT, dev_name(dev), dwc3_imx);
 	if (err) {
 		dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err);
 		goto depopulate;
 	}

 	device_set_wakeup_capable(dev, true);
 	pm_runtime_put(dev);

 	return 0;

 depopulate:
 	of_platform_depopulate(dev);
 disable_rpm:
 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);

 	return err;
 }

 static void dwc3_imx8mp_remove(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;

 	pm_runtime_get_sync(dev);
 	of_platform_depopulate(dev);

 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);
 }

 static int dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
 {
 	if (dwc3_imx->pm_suspended)
 		return 0;

 	/* Wakeup enable */
 	if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev))
 		dwc3_imx8mp_wakeup_enable(dwc3_imx, msg);

 	dwc3_imx->pm_suspended = true;

 	return 0;
 }

 static int dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
 {
 	struct dwc3	*dwc = platform_get_drvdata(dwc3_imx->dwc3);
 	int ret = 0;

 	if (!dwc3_imx->pm_suspended)
 		return 0;

 	/* Wakeup disable */
 	dwc3_imx8mp_wakeup_disable(dwc3_imx);
 	dwc3_imx->pm_suspended = false;

 	/* Upon power loss any previous configuration is lost, restore it */
 	imx8mp_configure_glue(dwc3_imx);

 	if (dwc3_imx->wakeup_pending) {
 		dwc3_imx->wakeup_pending = false;
 		if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {
 			pm_runtime_mark_last_busy(dwc->dev);
 			pm_runtime_put_autosuspend(dwc->dev);
 		} else {
 			/*
 			 * Add wait for xhci switch from suspend
 			 * clock to normal clock to detect connection.
 			 */
 			usleep_range(9000, 10000);
 		}
 		enable_irq(dwc3_imx->irq);
 	}

 	return ret;
 }

 static int dwc3_imx8mp_pm_suspend(struct device *dev)
 {
 	struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
 	int ret;

 	ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND);

 	if (device_may_wakeup(dwc3_imx->dev))
 		enable_irq_wake(dwc3_imx->irq);
 	else
 		clk_disable_unprepare(dwc3_imx->suspend_clk);

 	clk_disable_unprepare(dwc3_imx->hsio_clk);
 	dev_dbg(dev, "dwc3 imx8mp pm suspend.\n");

 	return ret;
 }

 static int dwc3_imx8mp_pm_resume(struct device *dev)
 {
 	struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
 	int ret;

 	if (device_may_wakeup(dwc3_imx->dev)) {
 		disable_irq_wake(dwc3_imx->irq);
 	} else {
 		ret = clk_prepare_enable(dwc3_imx->suspend_clk);
 		if (ret)
 			return ret;
 	}

 	ret = clk_prepare_enable(dwc3_imx->hsio_clk);
 	if (ret) {
 		clk_disable_unprepare(dwc3_imx->suspend_clk);
 		return ret;
 	}

 	ret = dwc3_imx8mp_resume(dwc3_imx, PMSG_RESUME);

 	pm_runtime_disable(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);

 	dev_dbg(dev, "dwc3 imx8mp pm resume.\n");

 	return ret;
 }

 static int dwc3_imx8mp_runtime_suspend(struct device *dev)
 {
 	struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);

 	dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n");

 	return dwc3_imx8mp_suspend(dwc3_imx, PMSG_AUTO_SUSPEND);
 }

 static int dwc3_imx8mp_runtime_resume(struct device *dev)
 {
 	struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);

 	dev_dbg(dev, "dwc3 imx8mp runtime resume.\n");

 	return dwc3_imx8mp_resume(dwc3_imx, PMSG_AUTO_RESUME);
 }

 static const struct dev_pm_ops dwc3_imx8mp_dev_pm_ops = {
 	SYSTEM_SLEEP_PM_OPS(dwc3_imx8mp_pm_suspend, dwc3_imx8mp_pm_resume)
 	RUNTIME_PM_OPS(dwc3_imx8mp_runtime_suspend, dwc3_imx8mp_runtime_resume,
 		       NULL)
 };

 static const struct of_device_id dwc3_imx8mp_of_match[] = {
 	{ .compatible = "fsl,imx8mp-dwc3", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, dwc3_imx8mp_of_match);

 static struct platform_driver dwc3_imx8mp_driver = {
 	.probe		= dwc3_imx8mp_probe,
 	.remove_new	= dwc3_imx8mp_remove,
 	.driver		= {
 		.name	= "imx8mp-dwc3",
 		.pm	= pm_ptr(&dwc3_imx8mp_dev_pm_ops),
 		.of_match_table	= dwc3_imx8mp_of_match,
 	},
 };

 module_platform_driver(dwc3_imx8mp_driver);

 MODULE_ALIAS("platform:imx8mp-dwc3");
 MODULE_AUTHOR("jun.li@nxp.com");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* dwc3-imx8mp.c - NXP imx8mp Specific Glue layer
	*
	* Copyright (c) 2020 NXP.
	*/

	#include <linux/cleanup.h>
	#include <linux/clk.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>

	#include "core.h"

	/* USB wakeup registers */
	#define USB_WAKEUP_CTRL 0x00

	/* Global wakeup interrupt enable, also used to clear interrupt */
	#define USB_WAKEUP_EN BIT(31)
	/* Wakeup from connect or disconnect, only for superspeed */
	#define USB_WAKEUP_SS_CONN BIT(5)
	/* 0 select vbus_valid, 1 select sessvld */
	#define USB_WAKEUP_VBUS_SRC_SESS_VAL BIT(4)
	/* Enable signal for wake up from u3 state */
	#define USB_WAKEUP_U3_EN BIT(3)
	/* Enable signal for wake up from id change */
	#define USB_WAKEUP_ID_EN BIT(2)
	/* Enable signal for wake up from vbus change */
	#define USB_WAKEUP_VBUS_EN BIT(1)
	/* Enable signal for wake up from dp/dm change */
	#define USB_WAKEUP_DPDM_EN BIT(0)

	#define USB_WAKEUP_EN_MASK GENMASK(5, 0)

	/* USB glue registers */
	#define USB_CTRL0 0x00
	#define USB_CTRL1 0x04

	#define USB_CTRL0_PORTPWR_EN BIT(12) /* 1 - PPC enabled (default) */
	#define USB_CTRL0_USB3_FIXED BIT(22) /* 1 - USB3 permanent attached */
	#define USB_CTRL0_USB2_FIXED BIT(23) /* 1 - USB2 permanent attached */

	#define USB_CTRL1_OC_POLARITY BIT(16) /* 0 - HIGH / 1 - LOW */
	#define USB_CTRL1_PWR_POLARITY BIT(17) /* 0 - HIGH / 1 - LOW */

	struct dwc3_imx8mp {
	struct device *dev;
	struct platform_device *dwc3;
	void __iomem *hsio_blk_base;
	void __iomem *glue_base;
	struct clk *hsio_clk;
	struct clk *suspend_clk;
	int irq;
	bool pm_suspended;
	bool wakeup_pending;
	};

	static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)
	{
	struct device *dev = dwc3_imx->dev;
	u32 value;

	if (!dwc3_imx->glue_base)
	return;

	value = readl(dwc3_imx->glue_base + USB_CTRL0);

	if (device_property_read_bool(dev, "fsl,permanently-attached"))
	value \|= (USB_CTRL0_USB2_FIXED \| USB_CTRL0_USB3_FIXED);
	else
	value &= ~(USB_CTRL0_USB2_FIXED \| USB_CTRL0_USB3_FIXED);

	if (device_property_read_bool(dev, "fsl,disable-port-power-control"))
	value &= ~(USB_CTRL0_PORTPWR_EN);
	else
	value \|= USB_CTRL0_PORTPWR_EN;

	writel(value, dwc3_imx->glue_base + USB_CTRL0);

	value = readl(dwc3_imx->glue_base + USB_CTRL1);
	if (device_property_read_bool(dev, "fsl,over-current-active-low"))
	value \|= USB_CTRL1_OC_POLARITY;
	else
	value &= ~USB_CTRL1_OC_POLARITY;

	if (device_property_read_bool(dev, "fsl,power-active-low"))
	value \|= USB_CTRL1_PWR_POLARITY;
	else
	value &= ~USB_CTRL1_PWR_POLARITY;

	writel(value, dwc3_imx->glue_base + USB_CTRL1);
	}

	static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx,
	pm_message_t msg)
	{
	struct dwc3 *dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
	u32 val;

	if (!dwc3)
	return;

	val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);

	if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci) {
	val \|= USB_WAKEUP_EN \| USB_WAKEUP_DPDM_EN;
	if (PMSG_IS_AUTO(msg))
	val \|= USB_WAKEUP_SS_CONN \| USB_WAKEUP_U3_EN;
	} else {
	val \|= USB_WAKEUP_EN \| USB_WAKEUP_VBUS_EN \|
	USB_WAKEUP_VBUS_SRC_SESS_VAL;
	}

	writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
	}

	static void dwc3_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc3_imx)
	{
	u32 val;

	val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
	val &= ~(USB_WAKEUP_EN \| USB_WAKEUP_EN_MASK);
	writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
	}

	static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx)
	{
	struct dwc3_imx8mp *dwc3_imx = _dwc3_imx;
	struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3);

	if (!dwc3_imx->pm_suspended)
	return IRQ_HANDLED;

	disable_irq_nosync(dwc3_imx->irq);
	dwc3_imx->wakeup_pending = true;

	if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci)
	pm_runtime_resume(&dwc->xhci->dev);
	else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
	pm_runtime_get(dwc->dev);

	return IRQ_HANDLED;
	}

	static int dwc3_imx8mp_set_software_node(struct device *dev)
	{
	struct property_entry props[3] = { 0 };
	int prop_idx = 0;

	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-missing-cas-quirk");
	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-skip-phy-init-quirk");

	return device_create_managed_software_node(dev, props, NULL);
	}

	static int dwc3_imx8mp_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;
	struct dwc3_imx8mp *dwc3_imx;
	struct resource *res;
	int err, irq;

	if (!node) {
	dev_err(dev, "device node not found\n");
	return -EINVAL;
	}

	dwc3_imx = devm_kzalloc(dev, sizeof(*dwc3_imx), GFP_KERNEL);
	if (!dwc3_imx)
	return -ENOMEM;

	platform_set_drvdata(pdev, dwc3_imx);

	dwc3_imx->dev = dev;

	dwc3_imx->hsio_blk_base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(dwc3_imx->hsio_blk_base))
	return PTR_ERR(dwc3_imx->hsio_blk_base);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res) {
	dev_warn(dev, "Base address for glue layer missing. Continuing without, some features are missing though.");
	} else {
	dwc3_imx->glue_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(dwc3_imx->glue_base))
	return PTR_ERR(dwc3_imx->glue_base);
	}

	dwc3_imx->hsio_clk = devm_clk_get_enabled(dev, "hsio");
	if (IS_ERR(dwc3_imx->hsio_clk))
	return dev_err_probe(dev, PTR_ERR(dwc3_imx->hsio_clk),
	"Failed to get hsio clk\n");

	dwc3_imx->suspend_clk = devm_clk_get_enabled(dev, "suspend");
	if (IS_ERR(dwc3_imx->suspend_clk))
	return dev_err_probe(dev, PTR_ERR(dwc3_imx->suspend_clk),
	"Failed to get suspend clk\n");

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;
	dwc3_imx->irq = irq;

	struct device_node *dwc3_np __free(device_node) = of_get_compatible_child(node,
	"snps,dwc3");
	if (!dwc3_np)
	return dev_err_probe(dev, -ENODEV, "failed to find dwc3 core child\n");

	imx8mp_configure_glue(dwc3_imx);

	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	err = pm_runtime_get_sync(dev);
	if (err < 0)
	goto disable_rpm;

	err = dwc3_imx8mp_set_software_node(dev);
	if (err) {
	err = -ENODEV;
	dev_err(dev, "failed to create software node\n");
	goto disable_rpm;
	}

	err = of_platform_populate(node, NULL, NULL, dev);
	if (err) {
	dev_err(&pdev->dev, "failed to create dwc3 core\n");
	goto disable_rpm;
	}

	dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np);
	if (!dwc3_imx->dwc3) {
	dev_err(dev, "failed to get dwc3 platform device\n");
	err = -ENODEV;
	goto depopulate;
	}

	err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt,
	IRQF_ONESHOT, dev_name(dev), dwc3_imx);
	if (err) {
	dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err);
	goto depopulate;
	}

	device_set_wakeup_capable(dev, true);
	pm_runtime_put(dev);

	return 0;

	depopulate:
	of_platform_depopulate(dev);
	disable_rpm:
	pm_runtime_disable(dev);
	pm_runtime_put_noidle(dev);

	return err;
	}

	static void dwc3_imx8mp_remove(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;

	pm_runtime_get_sync(dev);
	of_platform_depopulate(dev);

	pm_runtime_disable(dev);
	pm_runtime_put_noidle(dev);
	}

	static int dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
	{
	if (dwc3_imx->pm_suspended)
	return 0;

	/* Wakeup enable */
	if (PMSG_IS_AUTO(msg) \|\| device_may_wakeup(dwc3_imx->dev))
	dwc3_imx8mp_wakeup_enable(dwc3_imx, msg);

	dwc3_imx->pm_suspended = true;

	return 0;
	}

	static int dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg)
	{
	struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3);
	int ret = 0;

	if (!dwc3_imx->pm_suspended)
	return 0;

	/* Wakeup disable */
	dwc3_imx8mp_wakeup_disable(dwc3_imx);
	dwc3_imx->pm_suspended = false;

	/* Upon power loss any previous configuration is lost, restore it */
	imx8mp_configure_glue(dwc3_imx);

	if (dwc3_imx->wakeup_pending) {
	dwc3_imx->wakeup_pending = false;
	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {
	pm_runtime_mark_last_busy(dwc->dev);
	pm_runtime_put_autosuspend(dwc->dev);
	} else {
	/*
	* Add wait for xhci switch from suspend
	* clock to normal clock to detect connection.
	*/
	usleep_range(9000, 10000);
	}
	enable_irq(dwc3_imx->irq);
	}

	return ret;
	}

	static int dwc3_imx8mp_pm_suspend(struct device *dev)
	{
	struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
	int ret;

	ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND);

	if (device_may_wakeup(dwc3_imx->dev))
	enable_irq_wake(dwc3_imx->irq);
	else
	clk_disable_unprepare(dwc3_imx->suspend_clk);

	clk_disable_unprepare(dwc3_imx->hsio_clk);
	dev_dbg(dev, "dwc3 imx8mp pm suspend.\n");

	return ret;
	}

	static int dwc3_imx8mp_pm_resume(struct device *dev)
	{
	struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
	int ret;

	if (device_may_wakeup(dwc3_imx->dev)) {
	disable_irq_wake(dwc3_imx->irq);
	} else {
	ret = clk_prepare_enable(dwc3_imx->suspend_clk);
	if (ret)
	return ret;
	}

	ret = clk_prepare_enable(dwc3_imx->hsio_clk);
	if (ret) {
	clk_disable_unprepare(dwc3_imx->suspend_clk);
	return ret;
	}

	ret = dwc3_imx8mp_resume(dwc3_imx, PMSG_RESUME);

	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	dev_dbg(dev, "dwc3 imx8mp pm resume.\n");

	return ret;
	}

	static int dwc3_imx8mp_runtime_suspend(struct device *dev)
	{
	struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);

	dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n");

	return dwc3_imx8mp_suspend(dwc3_imx, PMSG_AUTO_SUSPEND);
	}

	static int dwc3_imx8mp_runtime_resume(struct device *dev)
	{
	struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);

	dev_dbg(dev, "dwc3 imx8mp runtime resume.\n");

	return dwc3_imx8mp_resume(dwc3_imx, PMSG_AUTO_RESUME);
	}

	static const struct dev_pm_ops dwc3_imx8mp_dev_pm_ops = {
	SYSTEM_SLEEP_PM_OPS(dwc3_imx8mp_pm_suspend, dwc3_imx8mp_pm_resume)
	RUNTIME_PM_OPS(dwc3_imx8mp_runtime_suspend, dwc3_imx8mp_runtime_resume,
	NULL)
	};

	static const struct of_device_id dwc3_imx8mp_of_match[] = {
	{ .compatible = "fsl,imx8mp-dwc3", },
	{},
	};
	MODULE_DEVICE_TABLE(of, dwc3_imx8mp_of_match);

	static struct platform_driver dwc3_imx8mp_driver = {
	.probe = dwc3_imx8mp_probe,
	.remove_new = dwc3_imx8mp_remove,
	.driver = {
	.name = "imx8mp-dwc3",
	.pm = pm_ptr(&dwc3_imx8mp_dev_pm_ops),
	.of_match_table = dwc3_imx8mp_of_match,
	},
	};

	module_platform_driver(dwc3_imx8mp_driver);

	MODULE_ALIAS("platform:imx8mp-dwc3");
	MODULE_AUTHOR("jun.li@nxp.com");
	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");