1/*
  2 * Samsung EXYNOS SoC series Display Port PHY driver
  3 *
  4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
  5 * Author: Jingoo Han <jg1.han@samsung.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 */
 11
 12#include <linux/err.h>
 13#include <linux/io.h>
 14#include <linux/kernel.h>
 15#include <linux/module.h>
 16#include <linux/mfd/syscon.h>
 17#include <linux/mfd/syscon/exynos5-pmu.h>
 18#include <linux/of.h>
 19#include <linux/of_address.h>
 20#include <linux/phy/phy.h>
 21#include <linux/platform_device.h>
 22#include <linux/regmap.h>
 23
 24struct exynos_dp_video_phy_drvdata {
 25	u32 phy_ctrl_offset;
 26};
 27
 28struct exynos_dp_video_phy {
 29	struct regmap *regs;
 30	const struct exynos_dp_video_phy_drvdata *drvdata;
 31};
 32
 33static int exynos_dp_video_phy_power_on(struct phy *phy)
 34{
 35	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
 36
 37	/* Disable power isolation on DP-PHY */
 38	return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
 39				  EXYNOS5_PHY_ENABLE, EXYNOS5_PHY_ENABLE);
 40}
 41
 42static int exynos_dp_video_phy_power_off(struct phy *phy)
 43{
 44	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
 45
 46	/* Enable power isolation on DP-PHY */
 47	return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
 48				  EXYNOS5_PHY_ENABLE, 0);
 49}
 50
 51static const struct phy_ops exynos_dp_video_phy_ops = {
 52	.power_on	= exynos_dp_video_phy_power_on,
 53	.power_off	= exynos_dp_video_phy_power_off,
 54	.owner		= THIS_MODULE,
 55};
 56
 57static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
 58	.phy_ctrl_offset	= EXYNOS5_DPTX_PHY_CONTROL,
 59};
 60
 61static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
 62	.phy_ctrl_offset	= EXYNOS5420_DPTX_PHY_CONTROL,
 63};
 64
 65static const struct of_device_id exynos_dp_video_phy_of_match[] = {
 66	{
 67		.compatible = "samsung,exynos5250-dp-video-phy",
 68		.data = &exynos5250_dp_video_phy,
 69	}, {
 70		.compatible = "samsung,exynos5420-dp-video-phy",
 71		.data = &exynos5420_dp_video_phy,
 72	},
 73	{ },
 74};
 75MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
 76
 77static int exynos_dp_video_phy_probe(struct platform_device *pdev)
 78{
 79	struct exynos_dp_video_phy *state;
 80	struct device *dev = &pdev->dev;
 81	const struct of_device_id *match;
 82	struct phy_provider *phy_provider;
 83	struct phy *phy;
 84
 85	state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
 86	if (!state)
 87		return -ENOMEM;
 88
 89	state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
 90						      "samsung,pmu-syscon");
 91	if (IS_ERR(state->regs)) {
 92		dev_err(dev, "Failed to lookup PMU regmap\n");
 93		return PTR_ERR(state->regs);
 94	}
 95
 96	match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node);
 97	state->drvdata = match->data;
 98
 99	phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
100	if (IS_ERR(phy)) {
101		dev_err(dev, "failed to create Display Port PHY\n");
102		return PTR_ERR(phy);
103	}
104	phy_set_drvdata(phy, state);
105
106	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
107
108	return PTR_ERR_OR_ZERO(phy_provider);
109}
110
111static struct platform_driver exynos_dp_video_phy_driver = {
112	.probe	= exynos_dp_video_phy_probe,
113	.driver = {
114		.name	= "exynos-dp-video-phy",
115		.of_match_table	= exynos_dp_video_phy_of_match,
116	}
117};
118module_platform_driver(exynos_dp_video_phy_driver);
119
120MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
121MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
122MODULE_LICENSE("GPL v2");