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(map: state->regs, reg: 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(map: state->regs, reg: state->drvdata->phy_ctrl_offset,
44 EXYNOS4_PHY_ENABLE, val: 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, size: sizeof(*state), GFP_KERNEL);
81 if (!state)
82 return -ENOMEM;
83
84 state->regs = syscon_node_to_regmap(np: dev->parent->of_node);
85 if (IS_ERR(ptr: state->regs))
86 /* Backwards compatible way */
87 state->regs = syscon_regmap_lookup_by_phandle(np: dev->of_node,
88 property: "samsung,pmu-syscon");
89 if (IS_ERR(ptr: state->regs)) {
90 dev_err(dev, "Failed to lookup PMU regmap\n");
91 return PTR_ERR(ptr: state->regs);
92 }
93
94 state->drvdata = of_device_get_match_data(dev);
95
96 phy = devm_phy_create(dev, NULL, ops: &exynos_dp_video_phy_ops);
97 if (IS_ERR(ptr: phy)) {
98 dev_err(dev, "failed to create Display Port PHY\n");
99 return PTR_ERR(ptr: phy);
100 }
101 phy_set_drvdata(phy, data: state);
102
103 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
104
105 return PTR_ERR_OR_ZERO(ptr: 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

source code of linux/drivers/phy/samsung/phy-exynos-dp-video.c