phy-exynos-dp-video.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Samsung Exynos SoC series Display Port PHY driver
  4 *
  5 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
  6 * Author: Jingoo Han <jg1.han@samsung.com>
  7 */
  8
  9#include <linux/err.h>
 10#include <linux/io.h>
 11#include <linux/kernel.h>
 12#include <linux/module.h>
 13#include <linux/mfd/syscon.h>
 14#include <linux/of.h>
 15#include <linux/phy/phy.h>
 16#include <linux/platform_device.h>
 17#include <linux/regmap.h>
 18#include <linux/soc/samsung/exynos-regs-pmu.h>
 19
 20struct exynos_dp_video_phy_drvdata {
 21	u32 phy_ctrl_offset;
 22};
 23
 24struct exynos_dp_video_phy {
 25	struct regmap *regs;
 26	const struct exynos_dp_video_phy_drvdata *drvdata;
 27};
 28
 29static int exynos_dp_video_phy_power_on(struct phy *phy)
 30{
 31	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
 32
 33	/* Disable power isolation on DP-PHY */
 34	return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
 35				  EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
 36}
 37
 38static int exynos_dp_video_phy_power_off(struct phy *phy)
 39{
 40	struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
 41
 42	/* Enable power isolation on DP-PHY */
 43	return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
 44				  EXYNOS4_PHY_ENABLE, 0);
 45}
 46
 47static const struct phy_ops exynos_dp_video_phy_ops = {
 48	.power_on	= exynos_dp_video_phy_power_on,
 49	.power_off	= exynos_dp_video_phy_power_off,
 50	.owner		= THIS_MODULE,
 51};
 52
 53static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
 54	.phy_ctrl_offset	= EXYNOS5_DPTX_PHY_CONTROL,
 55};
 56
 57static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
 58	.phy_ctrl_offset	= EXYNOS5420_DPTX_PHY_CONTROL,
 59};
 60
 61static const struct of_device_id exynos_dp_video_phy_of_match[] = {
 62	{
 63		.compatible = "samsung,exynos5250-dp-video-phy",
 64		.data = &exynos5250_dp_video_phy,
 65	}, {
 66		.compatible = "samsung,exynos5420-dp-video-phy",
 67		.data = &exynos5420_dp_video_phy,
 68	},
 69	{ },
 70};
 71MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
 72
 73static int exynos_dp_video_phy_probe(struct platform_device *pdev)
 74{
 75	struct exynos_dp_video_phy *state;
 76	struct device *dev = &pdev->dev;
 77	struct phy_provider *phy_provider;
 78	struct phy *phy;
 79
 80	state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
 81	if (!state)
 82		return -ENOMEM;
 83
 84	state->regs = syscon_node_to_regmap(dev->parent->of_node);
 85	if (IS_ERR(state->regs))
 86		/* Backwards compatible way */
 87		state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
 88							      "samsung,pmu-syscon");
 89	if (IS_ERR(state->regs)) {
 90		dev_err(dev, "Failed to lookup PMU regmap\n");
 91		return PTR_ERR(state->regs);
 92	}
 93
 94	state->drvdata = of_device_get_match_data(dev);
 95
 96	phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
 97	if (IS_ERR(phy)) {
 98		dev_err(dev, "failed to create Display Port PHY\n");
 99		return PTR_ERR(phy);
100	}
101	phy_set_drvdata(phy, state);
102
103	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
104
105	return PTR_ERR_OR_ZERO(phy_provider);
106}
107
108static struct platform_driver exynos_dp_video_phy_driver = {
109	.probe	= exynos_dp_video_phy_probe,
110	.driver = {
111		.name	= "exynos-dp-video-phy",
112		.of_match_table	= exynos_dp_video_phy_of_match,
113		.suppress_bind_attrs = true,
114	}
115};
116module_platform_driver(exynos_dp_video_phy_driver);
117
118MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
119MODULE_DESCRIPTION("Samsung Exynos SoC DP PHY driver");
120MODULE_LICENSE("GPL v2");