phy: Add driver for Exynos DP PHY

  1 - MIPI DSIM 0,

  2 - MIPI CSIS 1,

  3 - MIPI DSIM 1.

Samsung EXYNOS SoC series Display Port PHY

-------------------------------------------------

Required properties:

- compatible : should be "samsung,exynos5250-dp-video-phy";

- reg : offset and length of the Display Port PHY register set;

- #phy-cells : from the generic PHY bindings, must be 0;

	  This transceiver supports high and full speed devices plus,

	  in host mode, low speed.

config PHY_EXYNOS_DP_VIDEO

	tristate "EXYNOS SoC series Display Port PHY driver"

	depends on OF

	select GENERIC_PHY

	help

	  Support for Display Port PHY found on Samsung EXYNOS SoCs.

endmenu

#

obj-$(CONFIG_GENERIC_PHY)		+= phy-core.o

obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO)	+= phy-exynos-dp-video.o

obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO)	+= phy-exynos-mipi-video.o

obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o

obj-$(CONFIG_TWL4030_USB)		+= phy-twl4030-usb.o

/*

 * Samsung EXYNOS SoC series Display Port PHY driver

 *

 * Copyright (C) 2013 Samsung Electronics Co., Ltd.

 * Author: Jingoo Han <jg1.han@samsung.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/phy/phy.h>

#include <linux/platform_device.h>

/* DPTX_PHY_CONTROL register */

#define EXYNOS_DPTX_PHY_ENABLE		(1 << 0)

struct exynos_dp_video_phy {

	void __iomem *regs;

};

static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int on)

{

	u32 reg;

	reg = readl(state->regs);

	if (on)

		reg |= EXYNOS_DPTX_PHY_ENABLE;

	else

		reg &= ~EXYNOS_DPTX_PHY_ENABLE;

	writel(reg, state->regs);

	return 0;

}

static int exynos_dp_video_phy_power_on(struct phy *phy)

{

	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);

	return __set_phy_state(state, 1);

}

static int exynos_dp_video_phy_power_off(struct phy *phy)

{

	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);

	return __set_phy_state(state, 0);

}

static struct phy_ops exynos_dp_video_phy_ops = {

	.power_on	= exynos_dp_video_phy_power_on,

	.power_off	= exynos_dp_video_phy_power_off,

	.owner		= THIS_MODULE,

};

static int exynos_dp_video_phy_probe(struct platform_device *pdev)

{

	struct exynos_dp_video_phy *state;

	struct device *dev = &pdev->dev;

	struct resource *res;

	struct phy_provider *phy_provider;

	struct phy *phy;

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

	if (!state)

		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	state->regs = devm_ioremap_resource(dev, res);

	if (IS_ERR(state->regs))

		return PTR_ERR(state->regs);

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

	if (IS_ERR(phy_provider))

		return PTR_ERR(phy_provider);

	phy = devm_phy_create(dev, &exynos_dp_video_phy_ops, NULL);

	if (IS_ERR(phy)) {

		dev_err(dev, "failed to create Display Port PHY\n");

		return PTR_ERR(phy);

	}

	phy_set_drvdata(phy, state);

	return 0;

}

static const struct of_device_id exynos_dp_video_phy_of_match[] = {

	{ .compatible = "samsung,exynos5250-dp-video-phy" },

	{ },

};

MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);

static struct platform_driver exynos_dp_video_phy_driver = {

	.probe	= exynos_dp_video_phy_probe,

	.driver = {

		.name	= "exynos-dp-video-phy",

		.owner	= THIS_MODULE,

		.of_match_table	= exynos_dp_video_phy_of_match,

	}

};

module_platform_driver(exynos_dp_video_phy_driver);

MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");

MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");

MODULE_LICENSE("GPL v2");