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
20 struct exynos_dp_video_phy_drvdata {
21 u32 phy_ctrl_offset;
22 };
23
24 struct exynos_dp_video_phy {
25 struct regmap *regs;
26 const struct exynos_dp_video_phy_drvdata *drvdata;
27 };
28
exynos_dp_video_phy_power_on(struct phy * phy)29 static 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
exynos_dp_video_phy_power_off(struct phy * phy)38 static 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
47 static 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
53 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
54 .phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL,
55 };
56
57 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
58 .phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL,
59 };
60
61 static 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 };
71 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
72
exynos_dp_video_phy_probe(struct platform_device * pdev)73 static 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
108 static 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 };
116 module_platform_driver(exynos_dp_video_phy_driver);
117
118 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
119 MODULE_DESCRIPTION("Samsung Exynos SoC DP PHY driver");
120 MODULE_LICENSE("GPL v2");
121