drivers/usb/chipidea/usbmisc_imx.c - kernel/common - Git at Google

 /*
  * Copyright 2012 Freescale Semiconductor, Inc.
  *
  * The code contained herein is licensed under the GNU General Public
  * License. You may obtain a copy of the GNU General Public License
  * Version 2 or later at the following locations:
  *
  * http://www.opensource.org/licenses/gpl-license.html
  * http://www.gnu.org/copyleft/gpl.html
  */

 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/delay.h>

 #include "ci_hdrc_imx.h"

 #define MX25_USB_PHY_CTRL_OFFSET	0x08
 #define MX25_BM_EXTERNAL_VBUS_DIVIDER	BIT(23)

 #define MX25_EHCI_INTERFACE_SINGLE_UNI	(2 << 0)
 #define MX25_EHCI_INTERFACE_DIFF_UNI	(0 << 0)
 #define MX25_EHCI_INTERFACE_MASK	(0xf)

 #define MX25_OTG_SIC_SHIFT		29
 #define MX25_OTG_SIC_MASK		(0x3 << MX25_OTG_SIC_SHIFT)
 #define MX25_OTG_PM_BIT			BIT(24)
 #define MX25_OTG_PP_BIT			BIT(11)
 #define MX25_OTG_OCPOL_BIT		BIT(3)

 #define MX25_H1_SIC_SHIFT		21
 #define MX25_H1_SIC_MASK		(0x3 << MX25_H1_SIC_SHIFT)
 #define MX25_H1_PP_BIT			BIT(18)
 #define MX25_H1_PM_BIT			BIT(16)
 #define MX25_H1_IPPUE_UP_BIT		BIT(7)
 #define MX25_H1_IPPUE_DOWN_BIT		BIT(6)
 #define MX25_H1_TLL_BIT			BIT(5)
 #define MX25_H1_USBTE_BIT		BIT(4)
 #define MX25_H1_OCPOL_BIT		BIT(2)

 #define MX27_H1_PM_BIT			BIT(8)
 #define MX27_H2_PM_BIT			BIT(16)
 #define MX27_OTG_PM_BIT			BIT(24)

 #define MX53_USB_OTG_PHY_CTRL_0_OFFSET	0x08
 #define MX53_USB_OTG_PHY_CTRL_1_OFFSET	0x0c
 #define MX53_USB_UH2_CTRL_OFFSET	0x14
 #define MX53_USB_UH3_CTRL_OFFSET	0x18
 #define MX53_BM_OVER_CUR_DIS_H1		BIT(5)
 #define MX53_BM_OVER_CUR_DIS_OTG	BIT(8)
 #define MX53_BM_OVER_CUR_DIS_UHx	BIT(30)
 #define MX53_USB_PHYCTRL1_PLLDIV_MASK	0x3
 #define MX53_USB_PLL_DIV_24_MHZ		0x01

 #define MX6_BM_OVER_CUR_DIS		BIT(7)

 struct usbmisc_ops {
 	/* It's called once when probe a usb device */
 	int (*init)(struct imx_usbmisc_data *data);
 	/* It's called once after adding a usb device */
 	int (*post)(struct imx_usbmisc_data *data);
 };

 struct imx_usbmisc {
 	void __iomem *base;
 	spinlock_t lock;
 	struct clk *clk;
 	const struct usbmisc_ops *ops;
 };

 static struct imx_usbmisc *usbmisc;

 static int usbmisc_imx25_init(struct imx_usbmisc_data *data)
 {
 	unsigned long flags;
 	u32 val = 0;

 	if (data->index > 1)
 		return -EINVAL;

 	spin_lock_irqsave(&usbmisc->lock, flags);
 	switch (data->index) {
 	case 0:
 		val = readl(usbmisc->base);
 		val &= ~(MX25_OTG_SIC_MASK | MX25_OTG_PP_BIT);
 		val |= (MX25_EHCI_INTERFACE_DIFF_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_OTG_SIC_SHIFT;
 		val |= (MX25_OTG_PM_BIT | MX25_OTG_OCPOL_BIT);
 		writel(val, usbmisc->base);
 		break;
 	case 1:
 		val = readl(usbmisc->base);
 		val &= ~(MX25_H1_SIC_MASK | MX25_H1_PP_BIT |  MX25_H1_IPPUE_UP_BIT);
 		val |= (MX25_EHCI_INTERFACE_SINGLE_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_H1_SIC_SHIFT;
 		val |= (MX25_H1_PM_BIT | MX25_H1_OCPOL_BIT | MX25_H1_TLL_BIT |
 			MX25_H1_USBTE_BIT | MX25_H1_IPPUE_DOWN_BIT);

 		writel(val, usbmisc->base);

 		break;
 	}
 	spin_unlock_irqrestore(&usbmisc->lock, flags);

 	return 0;
 }

 static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
 {
 	void __iomem *reg;
 	unsigned long flags;
 	u32 val;

 	if (data->index > 2)
 		return -EINVAL;

 	reg = usbmisc->base + MX25_USB_PHY_CTRL_OFFSET;

 	if (data->evdo) {
 		spin_lock_irqsave(&usbmisc->lock, flags);
 		val = readl(reg);
 		writel(val | MX25_BM_EXTERNAL_VBUS_DIVIDER, reg);
 		spin_unlock_irqrestore(&usbmisc->lock, flags);
 		usleep_range(5000, 10000); /* needed to stabilize voltage */
 	}

 	return 0;
 }

 static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
 {
 	unsigned long flags;
 	u32 val;

 	switch (data->index) {
 	case 0:
 		val = MX27_OTG_PM_BIT;
 		break;
 	case 1:
 		val = MX27_H1_PM_BIT;
 		break;
 	case 2:
 		val = MX27_H2_PM_BIT;
 		break;
 	default:
 		return -EINVAL;
 	};

 	spin_lock_irqsave(&usbmisc->lock, flags);
 	if (data->disable_oc)
 		val = readl(usbmisc->base) | val;
 	else
 		val = readl(usbmisc->base) & ~val;
 	writel(val, usbmisc->base);
 	spin_unlock_irqrestore(&usbmisc->lock, flags);

 	return 0;
 }

 static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 {
 	void __iomem *reg = NULL;
 	unsigned long flags;
 	u32 val = 0;

 	if (data->index > 3)
 		return -EINVAL;

 	/* Select a 24 MHz reference clock for the PHY  */
 	reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_1_OFFSET;
 	val = readl(reg);
 	val &= ~MX53_USB_PHYCTRL1_PLLDIV_MASK;
 	val |= MX53_USB_PLL_DIV_24_MHZ;
 	writel(val, usbmisc->base + MX53_USB_OTG_PHY_CTRL_1_OFFSET);

 	if (data->disable_oc) {
 		spin_lock_irqsave(&usbmisc->lock, flags);
 		switch (data->index) {
 		case 0:
 			reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
 			val = readl(reg) | MX53_BM_OVER_CUR_DIS_OTG;
 			break;
 		case 1:
 			reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
 			val = readl(reg) | MX53_BM_OVER_CUR_DIS_H1;
 			break;
 		case 2:
 			reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
 			val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
 			break;
 		case 3:
 			reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
 			val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
 			break;
 		}
 		if (reg && val)
 			writel(val, reg);
 		spin_unlock_irqrestore(&usbmisc->lock, flags);
 	}

 	return 0;
 }

 static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
 {
 	unsigned long flags;
 	u32 reg;

 	if (data->index > 3)
 		return -EINVAL;

 	if (data->disable_oc) {
 		spin_lock_irqsave(&usbmisc->lock, flags);
 		reg = readl(usbmisc->base + data->index * 4);
 		writel(reg | MX6_BM_OVER_CUR_DIS,
 			usbmisc->base + data->index * 4);
 		spin_unlock_irqrestore(&usbmisc->lock, flags);
 	}

 	return 0;
 }

 static const struct usbmisc_ops imx25_usbmisc_ops = {
 	.init = usbmisc_imx25_init,
 	.post = usbmisc_imx25_post,
 };

 static const struct usbmisc_ops imx27_usbmisc_ops = {
 	.init = usbmisc_imx27_init,
 };

 static const struct usbmisc_ops imx53_usbmisc_ops = {
 	.init = usbmisc_imx53_init,
 };

 static const struct usbmisc_ops imx6q_usbmisc_ops = {
 	.init = usbmisc_imx6q_init,
 };

 int imx_usbmisc_init(struct imx_usbmisc_data *data)
 {
 	if (!usbmisc)
 		return -EPROBE_DEFER;
 	if (!usbmisc->ops->init)
 		return 0;
 	return usbmisc->ops->init(data);
 }
 EXPORT_SYMBOL_GPL(imx_usbmisc_init);

 int imx_usbmisc_init_post(struct imx_usbmisc_data *data)
 {
 	if (!usbmisc)
 		return -EPROBE_DEFER;
 	if (!usbmisc->ops->post)
 		return 0;
 	return usbmisc->ops->post(data);
 }
 EXPORT_SYMBOL_GPL(imx_usbmisc_init_post);

 static const struct of_device_id usbmisc_imx_dt_ids[] = {
 	{
 		.compatible = "fsl,imx25-usbmisc",
 		.data = &imx25_usbmisc_ops,
 	},
 	{
 		.compatible = "fsl,imx35-usbmisc",
 		.data = &imx25_usbmisc_ops,
 	},
 	{
 		.compatible = "fsl,imx27-usbmisc",
 		.data = &imx27_usbmisc_ops,
 	},
 	{
 		.compatible = "fsl,imx51-usbmisc",
 		.data = &imx53_usbmisc_ops,
 	},
 	{
 		.compatible = "fsl,imx53-usbmisc",
 		.data = &imx53_usbmisc_ops,
 	},
 	{
 		.compatible = "fsl,imx6q-usbmisc",
 		.data = &imx6q_usbmisc_ops,
 	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);

 static int usbmisc_imx_probe(struct platform_device *pdev)
 {
 	struct resource	*res;
 	struct imx_usbmisc *data;
 	int ret;
 	struct of_device_id *tmp_dev;

 	if (usbmisc)
 		return -EBUSY;

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

 	spin_lock_init(&data->lock);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	data->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(data->base))
 		return PTR_ERR(data->base);

 	data->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(data->clk)) {
 		dev_err(&pdev->dev,
 			"failed to get clock, err=%ld\n", PTR_ERR(data->clk));
 		return PTR_ERR(data->clk);
 	}

 	ret = clk_prepare_enable(data->clk);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"clk_prepare_enable failed, err=%d\n", ret);
 		return ret;
 	}

 	tmp_dev = (struct of_device_id *)
 		of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
 	data->ops = (const struct usbmisc_ops *)tmp_dev->data;
 	usbmisc = data;

 	return 0;
 }

 static int usbmisc_imx_remove(struct platform_device *pdev)
 {
 	clk_disable_unprepare(usbmisc->clk);
 	usbmisc = NULL;
 	return 0;
 }

 static struct platform_driver usbmisc_imx_driver = {
 	.probe = usbmisc_imx_probe,
 	.remove = usbmisc_imx_remove,
 	.driver = {
 		.name = "usbmisc_imx",
 		.owner = THIS_MODULE,
 		.of_match_table = usbmisc_imx_dt_ids,
 	 },
 };

 module_platform_driver(usbmisc_imx_driver);

 MODULE_ALIAS("platform:usbmisc-imx");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("driver for imx usb non-core registers");
 MODULE_AUTHOR("Richard Zhao <[email protected]>");
	/*
	* Copyright 2012 Freescale Semiconductor, Inc.
	*
	* The code contained herein is licensed under the GNU General Public
	* License. You may obtain a copy of the GNU General Public License
	* Version 2 or later at the following locations:
	*
	* http://www.opensource.org/licenses/gpl-license.html
	* http://www.gnu.org/copyleft/gpl.html
	*/

	#include <linux/module.h>
	#include <linux/of_platform.h>
	#include <linux/clk.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/delay.h>

	#include "ci_hdrc_imx.h"

	#define MX25_USB_PHY_CTRL_OFFSET 0x08
	#define MX25_BM_EXTERNAL_VBUS_DIVIDER BIT(23)

	#define MX25_EHCI_INTERFACE_SINGLE_UNI (2 << 0)
	#define MX25_EHCI_INTERFACE_DIFF_UNI (0 << 0)
	#define MX25_EHCI_INTERFACE_MASK (0xf)

	#define MX25_OTG_SIC_SHIFT 29
	#define MX25_OTG_SIC_MASK (0x3 << MX25_OTG_SIC_SHIFT)
	#define MX25_OTG_PM_BIT BIT(24)
	#define MX25_OTG_PP_BIT BIT(11)
	#define MX25_OTG_OCPOL_BIT BIT(3)

	#define MX25_H1_SIC_SHIFT 21
	#define MX25_H1_SIC_MASK (0x3 << MX25_H1_SIC_SHIFT)
	#define MX25_H1_PP_BIT BIT(18)
	#define MX25_H1_PM_BIT BIT(16)
	#define MX25_H1_IPPUE_UP_BIT BIT(7)
	#define MX25_H1_IPPUE_DOWN_BIT BIT(6)
	#define MX25_H1_TLL_BIT BIT(5)
	#define MX25_H1_USBTE_BIT BIT(4)
	#define MX25_H1_OCPOL_BIT BIT(2)

	#define MX27_H1_PM_BIT BIT(8)
	#define MX27_H2_PM_BIT BIT(16)
	#define MX27_OTG_PM_BIT BIT(24)

	#define MX53_USB_OTG_PHY_CTRL_0_OFFSET 0x08
	#define MX53_USB_OTG_PHY_CTRL_1_OFFSET 0x0c
	#define MX53_USB_UH2_CTRL_OFFSET 0x14
	#define MX53_USB_UH3_CTRL_OFFSET 0x18
	#define MX53_BM_OVER_CUR_DIS_H1 BIT(5)
	#define MX53_BM_OVER_CUR_DIS_OTG BIT(8)
	#define MX53_BM_OVER_CUR_DIS_UHx BIT(30)
	#define MX53_USB_PHYCTRL1_PLLDIV_MASK 0x3
	#define MX53_USB_PLL_DIV_24_MHZ 0x01

	#define MX6_BM_OVER_CUR_DIS BIT(7)

	struct usbmisc_ops {
	/* It's called once when probe a usb device */
	int (init)(struct imx_usbmisc_data data);
	/* It's called once after adding a usb device */
	int (post)(struct imx_usbmisc_data data);
	};

	struct imx_usbmisc {
	void __iomem *base;
	spinlock_t lock;
	struct clk *clk;
	const struct usbmisc_ops *ops;
	};

	static struct imx_usbmisc *usbmisc;

	static int usbmisc_imx25_init(struct imx_usbmisc_data *data)
	{
	unsigned long flags;
	u32 val = 0;

	if (data->index > 1)
	return -EINVAL;

	spin_lock_irqsave(&usbmisc->lock, flags);
	switch (data->index) {
	case 0:
	val = readl(usbmisc->base);
	val &= ~(MX25_OTG_SIC_MASK \| MX25_OTG_PP_BIT);
	val \|= (MX25_EHCI_INTERFACE_DIFF_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_OTG_SIC_SHIFT;
	val \|= (MX25_OTG_PM_BIT \| MX25_OTG_OCPOL_BIT);
	writel(val, usbmisc->base);
	break;
	case 1:
	val = readl(usbmisc->base);
	val &= ~(MX25_H1_SIC_MASK \| MX25_H1_PP_BIT \| MX25_H1_IPPUE_UP_BIT);
	val \|= (MX25_EHCI_INTERFACE_SINGLE_UNI & MX25_EHCI_INTERFACE_MASK) << MX25_H1_SIC_SHIFT;
	val \|= (MX25_H1_PM_BIT \| MX25_H1_OCPOL_BIT \| MX25_H1_TLL_BIT \|
	MX25_H1_USBTE_BIT \| MX25_H1_IPPUE_DOWN_BIT);

	writel(val, usbmisc->base);

	break;
	}
	spin_unlock_irqrestore(&usbmisc->lock, flags);

	return 0;
	}

	static int usbmisc_imx25_post(struct imx_usbmisc_data *data)
	{
	void __iomem *reg;
	unsigned long flags;
	u32 val;

	if (data->index > 2)
	return -EINVAL;

	reg = usbmisc->base + MX25_USB_PHY_CTRL_OFFSET;

	if (data->evdo) {
	spin_lock_irqsave(&usbmisc->lock, flags);
	val = readl(reg);
	writel(val \| MX25_BM_EXTERNAL_VBUS_DIVIDER, reg);
	spin_unlock_irqrestore(&usbmisc->lock, flags);
	usleep_range(5000, 10000); /* needed to stabilize voltage */
	}

	return 0;
	}

	static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
	{
	unsigned long flags;
	u32 val;

	switch (data->index) {
	case 0:
	val = MX27_OTG_PM_BIT;
	break;
	case 1:
	val = MX27_H1_PM_BIT;
	break;
	case 2:
	val = MX27_H2_PM_BIT;
	break;
	default:
	return -EINVAL;
	};

	spin_lock_irqsave(&usbmisc->lock, flags);
	if (data->disable_oc)
	val = readl(usbmisc->base) \| val;
	else
	val = readl(usbmisc->base) & ~val;
	writel(val, usbmisc->base);
	spin_unlock_irqrestore(&usbmisc->lock, flags);

	return 0;
	}

	static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
	{
	void __iomem *reg = NULL;
	unsigned long flags;
	u32 val = 0;

	if (data->index > 3)
	return -EINVAL;

	/* Select a 24 MHz reference clock for the PHY */
	reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_1_OFFSET;
	val = readl(reg);
	val &= ~MX53_USB_PHYCTRL1_PLLDIV_MASK;
	val \|= MX53_USB_PLL_DIV_24_MHZ;
	writel(val, usbmisc->base + MX53_USB_OTG_PHY_CTRL_1_OFFSET);

	if (data->disable_oc) {
	spin_lock_irqsave(&usbmisc->lock, flags);
	switch (data->index) {
	case 0:
	reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
	val = readl(reg) \| MX53_BM_OVER_CUR_DIS_OTG;
	break;
	case 1:
	reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
	val = readl(reg) \| MX53_BM_OVER_CUR_DIS_H1;
	break;
	case 2:
	reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
	val = readl(reg) \| MX53_BM_OVER_CUR_DIS_UHx;
	break;
	case 3:
	reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
	val = readl(reg) \| MX53_BM_OVER_CUR_DIS_UHx;
	break;
	}
	if (reg && val)
	writel(val, reg);
	spin_unlock_irqrestore(&usbmisc->lock, flags);
	}

	return 0;
	}

	static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
	{
	unsigned long flags;
	u32 reg;

	if (data->index > 3)
	return -EINVAL;

	if (data->disable_oc) {
	spin_lock_irqsave(&usbmisc->lock, flags);
	reg = readl(usbmisc->base + data->index * 4);
	writel(reg \| MX6_BM_OVER_CUR_DIS,
	usbmisc->base + data->index * 4);
	spin_unlock_irqrestore(&usbmisc->lock, flags);
	}

	return 0;
	}

	static const struct usbmisc_ops imx25_usbmisc_ops = {
	.init = usbmisc_imx25_init,
	.post = usbmisc_imx25_post,
	};

	static const struct usbmisc_ops imx27_usbmisc_ops = {
	.init = usbmisc_imx27_init,
	};

	static const struct usbmisc_ops imx53_usbmisc_ops = {
	.init = usbmisc_imx53_init,
	};

	static const struct usbmisc_ops imx6q_usbmisc_ops = {
	.init = usbmisc_imx6q_init,
	};

	int imx_usbmisc_init(struct imx_usbmisc_data *data)
	{
	if (!usbmisc)
	return -EPROBE_DEFER;
	if (!usbmisc->ops->init)
	return 0;
	return usbmisc->ops->init(data);
	}
	EXPORT_SYMBOL_GPL(imx_usbmisc_init);

	int imx_usbmisc_init_post(struct imx_usbmisc_data *data)
	{
	if (!usbmisc)
	return -EPROBE_DEFER;
	if (!usbmisc->ops->post)
	return 0;
	return usbmisc->ops->post(data);
	}
	EXPORT_SYMBOL_GPL(imx_usbmisc_init_post);

	static const struct of_device_id usbmisc_imx_dt_ids[] = {
	{
	.compatible = "fsl,imx25-usbmisc",
	.data = &imx25_usbmisc_ops,
	},
	{
	.compatible = "fsl,imx35-usbmisc",
	.data = &imx25_usbmisc_ops,
	},
	{
	.compatible = "fsl,imx27-usbmisc",
	.data = &imx27_usbmisc_ops,
	},
	{
	.compatible = "fsl,imx51-usbmisc",
	.data = &imx53_usbmisc_ops,
	},
	{
	.compatible = "fsl,imx53-usbmisc",
	.data = &imx53_usbmisc_ops,
	},
	{
	.compatible = "fsl,imx6q-usbmisc",
	.data = &imx6q_usbmisc_ops,
	},
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);

	static int usbmisc_imx_probe(struct platform_device *pdev)
	{
	struct resource *res;
	struct imx_usbmisc *data;
	int ret;
	struct of_device_id *tmp_dev;

	if (usbmisc)
	return -EBUSY;

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

	spin_lock_init(&data->lock);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	data->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(data->base))
	return PTR_ERR(data->base);

	data->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(data->clk)) {
	dev_err(&pdev->dev,
	"failed to get clock, err=%ld\n", PTR_ERR(data->clk));
	return PTR_ERR(data->clk);
	}

	ret = clk_prepare_enable(data->clk);
	if (ret) {
	dev_err(&pdev->dev,
	"clk_prepare_enable failed, err=%d\n", ret);
	return ret;
	}

	tmp_dev = (struct of_device_id *)
	of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
	data->ops = (const struct usbmisc_ops *)tmp_dev->data;
	usbmisc = data;

	return 0;
	}

	static int usbmisc_imx_remove(struct platform_device *pdev)
	{
	clk_disable_unprepare(usbmisc->clk);
	usbmisc = NULL;
	return 0;
	}

	static struct platform_driver usbmisc_imx_driver = {
	.probe = usbmisc_imx_probe,
	.remove = usbmisc_imx_remove,
	.driver = {
	.name = "usbmisc_imx",
	.owner = THIS_MODULE,
	.of_match_table = usbmisc_imx_dt_ids,
	},
	};

	module_platform_driver(usbmisc_imx_driver);

	MODULE_ALIAS("platform:usbmisc-imx");
	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("driver for imx usb non-core registers");
	MODULE_AUTHOR("Richard Zhao <[email protected]>");