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/of_address.h>
16 #include <linux/of_device.h>
17 #include <linux/phy/phy.h>
18 #include <linux/platform_device.h>
19 #include <linux/regmap.h>
20 #include <linux/soc/samsung/exynos-regs-pmu.h>
21
22 struct exynos_dp_video_phy_drvdata {
23 u32 phy_ctrl_offset;
24 };
25
26 struct exynos_dp_video_phy {
27 struct regmap *regs;
28 const struct exynos_dp_video_phy_drvdata *drvdata;
29 };
30
exynos_dp_video_phy_power_on(struct phy * phy)31 static int exynos_dp_video_phy_power_on(struct phy *phy)
32 {
33 struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
34
35 /* Disable power isolation on DP-PHY */
36 return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
37 EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
38 }
39
exynos_dp_video_phy_power_off(struct phy * phy)40 static int exynos_dp_video_phy_power_off(struct phy *phy)
41 {
42 struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
43
44 /* Enable power isolation on DP-PHY */
45 return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
46 EXYNOS4_PHY_ENABLE, 0);
47 }
48
49 static const struct phy_ops exynos_dp_video_phy_ops = {
50 .power_on = exynos_dp_video_phy_power_on,
51 .power_off = exynos_dp_video_phy_power_off,
52 .owner = THIS_MODULE,
53 };
54
55 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
56 .phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL,
57 };
58
59 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
60 .phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL,
61 };
62
63 static const struct of_device_id exynos_dp_video_phy_of_match[] = {
64 {
65 .compatible = "samsung,exynos5250-dp-video-phy",
66 .data = &exynos5250_dp_video_phy,
67 }, {
68 .compatible = "samsung,exynos5420-dp-video-phy",
69 .data = &exynos5420_dp_video_phy,
70 },
71 { },
72 };
73 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
74
exynos_dp_video_phy_probe(struct platform_device * pdev)75 static int exynos_dp_video_phy_probe(struct platform_device *pdev)
76 {
77 struct exynos_dp_video_phy *state;
78 struct device *dev = &pdev->dev;
79 struct phy_provider *phy_provider;
80 struct phy *phy;
81
82 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
83 if (!state)
84 return -ENOMEM;
85
86 state->regs = syscon_node_to_regmap(dev->parent->of_node);
87 if (IS_ERR(state->regs))
88 /* Backwards compatible way */
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 state->drvdata = of_device_get_match_data(dev);
97
98 phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
99 if (IS_ERR(phy)) {
100 dev_err(dev, "failed to create Display Port PHY\n");
101 return PTR_ERR(phy);
102 }
103 phy_set_drvdata(phy, state);
104
105 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
106
107 return PTR_ERR_OR_ZERO(phy_provider);
108 }
109
110 static struct platform_driver exynos_dp_video_phy_driver = {
111 .probe = exynos_dp_video_phy_probe,
112 .driver = {
113 .name = "exynos-dp-video-phy",
114 .of_match_table = exynos_dp_video_phy_of_match,
115 .suppress_bind_attrs = true,
116 }
117 };
118 module_platform_driver(exynos_dp_video_phy_driver);
119
120 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
121 MODULE_DESCRIPTION("Samsung Exynos SoC DP PHY driver");
122 MODULE_LICENSE("GPL v2");
123