Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 74988e8b authored by Jingoo Han's avatar Jingoo Han Committed by Greg Kroah-Hartman
Browse files

phy: Add driver for Exynos DP PHY



Add a PHY provider driver for the Samsung Exynos SoC Display Port PHY.

Signed-off-by: default avatarJingoo Han <jg1.han@samsung.com>
Reviewed-by: default avatarTomasz Figa <t.figa@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e66f233d
Loading
Loading
Loading
Loading
+8 −0
Original line number Diff line number Diff line
@@ -12,3 +12,11 @@ the PHY specifier identifies the PHY and its meaning is as follows:
  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;
+7 −0
Original line number Diff line number Diff line
@@ -44,4 +44,11 @@ config TWL4030_USB
	  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
+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@
#

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
+111 −0
Original line number Diff line number Diff line
/*
 * 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");