tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Samsung EXYNOS SoC series Display Port PHY driver
3 *
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * Author: Jingoo Han <jg1.han@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/io.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <linux/phy/phy.h>
18#include <linux/platform_device.h>
19
20/* DPTX_PHY_CONTROL register */
21#define EXYNOS_DPTX_PHY_ENABLE (1 << 0)
22
23struct exynos_dp_video_phy {
24 void __iomem *regs;
25};
26
27static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int on)
28{
29 u32 reg;
30
31 reg = readl(state->regs);
32 if (on)
33 reg |= EXYNOS_DPTX_PHY_ENABLE;
34 else
35 reg &= ~EXYNOS_DPTX_PHY_ENABLE;
36 writel(reg, state->regs);
37
38 return 0;
39}
40
41static int exynos_dp_video_phy_power_on(struct phy *phy)
42{
43 struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
44
45 return __set_phy_state(state, 1);
46}
47
48static int exynos_dp_video_phy_power_off(struct phy *phy)
49{
50 struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
51
52 return __set_phy_state(state, 0);
53}
54
55static struct phy_ops exynos_dp_video_phy_ops = {
56 .power_on = exynos_dp_video_phy_power_on,
57 .power_off = exynos_dp_video_phy_power_off,
58 .owner = THIS_MODULE,
59};
60
61static int exynos_dp_video_phy_probe(struct platform_device *pdev)
62{
63 struct exynos_dp_video_phy *state;
64 struct device *dev = &pdev->dev;
65 struct resource *res;
66 struct phy_provider *phy_provider;
67 struct phy *phy;
68
69 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
70 if (!state)
71 return -ENOMEM;
72
73 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
74
75 state->regs = devm_ioremap_resource(dev, res);
76 if (IS_ERR(state->regs))
77 return PTR_ERR(state->regs);
78
79 phy = devm_phy_create(dev, &exynos_dp_video_phy_ops, NULL);
80 if (IS_ERR(phy)) {
81 dev_err(dev, "failed to create Display Port PHY\n");
82 return PTR_ERR(phy);
83 }
84 phy_set_drvdata(phy, state);
85
86 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
87 if (IS_ERR(phy_provider))
88 return PTR_ERR(phy_provider);
89
90 return 0;
91}
92
93static const struct of_device_id exynos_dp_video_phy_of_match[] = {
94 { .compatible = "samsung,exynos5250-dp-video-phy" },
95 { },
96};
97MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
98
99static struct platform_driver exynos_dp_video_phy_driver = {
100 .probe = exynos_dp_video_phy_probe,
101 .driver = {
102 .name = "exynos-dp-video-phy",
103 .owner = THIS_MODULE,
104 .of_match_table = exynos_dp_video_phy_of_match,
105 }
106};
107module_platform_driver(exynos_dp_video_phy_driver);
108
109MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
110MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
111MODULE_LICENSE("GPL v2");