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");
121