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Commit efe81bea authored by Li Jun's avatar Li Jun Committed by Kishon Vijay Abraham I
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phy: add driver for Freescale i.MX8MQ USB3 PHY 



This is a cleaned up port of the downstream i.MX8MQ USB3 PHY driver.

Signed-off-by: default avatarLi Jun <jun.li@nxp.com>
Signed-off-by: default avatarLucas Stach <l.stach@pengutronix.de>
Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
parent 3c2ce40b

drivers/phy/Kconfig

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@@ -44,6 +44,7 @@ source "drivers/phy/allwinner/Kconfig" 
source "drivers/phy/amlogic/Kconfig"

source "drivers/phy/broadcom/Kconfig"

source "drivers/phy/cadence/Kconfig"

source "drivers/phy/freescale/Kconfig"

source "drivers/phy/hisilicon/Kconfig"

source "drivers/phy/lantiq/Kconfig"

source "drivers/phy/marvell/Kconfig"

drivers/phy/Makefile

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@@ -16,6 +16,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ 
obj-$(CONFIG_ARCH_TEGRA)		+= tegra/

obj-y					+= broadcom/	\

					   cadence/	\

					   freescale/	\

					   hisilicon/	\

					   marvell/	\

					   motorola/	\

drivers/phy/freescale/Kconfig

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config PHY_FSL_IMX8MQ_USB

	tristate "Freescale i.MX8M USB3 PHY"

	depends on OF && HAS_IOMEM

	select GENERIC_PHY

	default SOC_IMX8MQ

drivers/phy/freescale/Makefile

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obj-$(CONFIG_PHY_FSL_IMX8MQ_USB)	+= phy-fsl-imx8mq-usb.o

drivers/phy/freescale/phy-fsl-imx8mq-usb.c

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+127 −0
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// SPDX-License-Identifier: GPL-2.0+

/* Copyright (c) 2017 NXP. */



#include <linux/clk.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/phy/phy.h>

#include <linux/platform_device.h>



#define PHY_CTRL0			0x0

#define PHY_CTRL0_REF_SSP_EN		BIT(2)



#define PHY_CTRL1			0x4

#define PHY_CTRL1_RESET			BIT(0)

#define PHY_CTRL1_COMMONONN		BIT(1)

#define PHY_CTRL1_ATERESET		BIT(3)

#define PHY_CTRL1_VDATSRCENB0		BIT(19)

#define PHY_CTRL1_VDATDETENB0		BIT(20)



#define PHY_CTRL2			0x8

#define PHY_CTRL2_TXENABLEN0		BIT(8)



struct imx8mq_usb_phy {

	struct phy *phy;

	struct clk *clk;

	void __iomem *base;

};



static int imx8mq_usb_phy_init(struct phy *phy)

{

	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);

	u32 value;



	value = readl(imx_phy->base + PHY_CTRL1);

	value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0 |

		   PHY_CTRL1_COMMONONN);

	value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;

	writel(value, imx_phy->base + PHY_CTRL1);



	value = readl(imx_phy->base + PHY_CTRL0);

	value |= PHY_CTRL0_REF_SSP_EN;

	writel(value, imx_phy->base + PHY_CTRL0);



	value = readl(imx_phy->base + PHY_CTRL2);

	value |= PHY_CTRL2_TXENABLEN0;

	writel(value, imx_phy->base + PHY_CTRL2);



	value = readl(imx_phy->base + PHY_CTRL1);

	value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);

	writel(value, imx_phy->base + PHY_CTRL1);



	return 0;

}



static int imx8mq_phy_power_on(struct phy *phy)

{

	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);



	return clk_prepare_enable(imx_phy->clk);

}



static int imx8mq_phy_power_off(struct phy *phy)

{

	struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);



	clk_disable_unprepare(imx_phy->clk);



	return 0;

}



static struct phy_ops imx8mq_usb_phy_ops = {

	.init		= imx8mq_usb_phy_init,

	.power_on	= imx8mq_phy_power_on,

	.power_off	= imx8mq_phy_power_off,

	.owner		= THIS_MODULE,

};



static int imx8mq_usb_phy_probe(struct platform_device *pdev)

{

	struct phy_provider *phy_provider;

	struct device *dev = &pdev->dev;

	struct imx8mq_usb_phy *imx_phy;

	struct resource *res;



	imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);

	if (!imx_phy)

		return -ENOMEM;



	imx_phy->clk = devm_clk_get(dev, "phy");

	if (IS_ERR(imx_phy->clk)) {

		dev_err(dev, "failed to get imx8mq usb phy clock\n");

		return PTR_ERR(imx_phy->clk);

	}



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	imx_phy->base = devm_ioremap_resource(dev, res);

	if (IS_ERR(imx_phy->base))

		return PTR_ERR(imx_phy->base);



	imx_phy->phy = devm_phy_create(dev, NULL, &imx8mq_usb_phy_ops);

	if (IS_ERR(imx_phy->phy))

		return PTR_ERR(imx_phy->phy);



	phy_set_drvdata(imx_phy->phy, imx_phy);



	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);



	return PTR_ERR_OR_ZERO(phy_provider);

}



static const struct of_device_id imx8mq_usb_phy_of_match[] = {

	{.compatible = "fsl,imx8mq-usb-phy",},

	{ },

};

MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);



static struct platform_driver imx8mq_usb_phy_driver = {

	.probe	= imx8mq_usb_phy_probe,

	.driver = {

		.name	= "imx8mq-usb-phy",

		.of_match_table	= imx8mq_usb_phy_of_match,

	}

};

module_platform_driver(imx8mq_usb_phy_driver);



MODULE_DESCRIPTION("FSL IMX8MQ USB PHY driver");

MODULE_LICENSE("GPL");