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