drivers/phy/phy-exynos-dp-video.c

   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/err.h>
  13 #include <linux/io.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <linux/mfd/syscon/exynos5-pmu.h>
  18 #include <linux/of.h>
  19 #include <linux/of_address.h>
  20 #include <linux/phy/phy.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regmap.h>
  23
  24 struct exynos_dp_video_phy_drvdata {
  25         u32 phy_ctrl_offset;
  26 };
  27
  28 struct exynos_dp_video_phy {
  29         struct regmap *regs;
  30         const struct exynos_dp_video_phy_drvdata *drvdata;
  31 };
  32
  33 static int exynos_dp_video_phy_power_on(struct phy *phy)
  34 {
  35         struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  36
  37         /* Disable power isolation on DP-PHY */
  38         return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
  39                                   EXYNOS5_PHY_ENABLE, EXYNOS5_PHY_ENABLE);
  40 }
  41
  42 static int exynos_dp_video_phy_power_off(struct phy *phy)
  43 {
  44         struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  45
  46         /* Enable power isolation on DP-PHY */
  47         return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
  48                                   EXYNOS5_PHY_ENABLE, 0);
  49 }
  50
  51 static const struct phy_ops exynos_dp_video_phy_ops = {
  52         .power_on       = exynos_dp_video_phy_power_on,
  53         .power_off      = exynos_dp_video_phy_power_off,
  54         .owner          = THIS_MODULE,
  55 };
  56
  57 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
  58         .phy_ctrl_offset        = EXYNOS5_DPTX_PHY_CONTROL,
  59 };
  60
  61 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
  62         .phy_ctrl_offset        = EXYNOS5420_DPTX_PHY_CONTROL,
  63 };
  64
  65 static const struct of_device_id exynos_dp_video_phy_of_match[] = {
  66         {
  67                 .compatible = "samsung,exynos5250-dp-video-phy",
  68                 .data = &exynos5250_dp_video_phy,
  69         }, {
  70                 .compatible = "samsung,exynos5420-dp-video-phy",
  71                 .data = &exynos5420_dp_video_phy,
  72         },
  73         { },
  74 };
  75 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
  76
  77 static int exynos_dp_video_phy_probe(struct platform_device *pdev)
  78 {
  79         struct exynos_dp_video_phy *state;
  80         struct device *dev = &pdev->dev;
  81         const struct of_device_id *match;
  82         struct phy_provider *phy_provider;
  83         struct phy *phy;
  84
  85         state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
  86         if (!state)
  87                 return -ENOMEM;
  88
  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         match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node);
  97         state->drvdata = match->data;
  98
  99         phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
 100         if (IS_ERR(phy)) {
 101                 dev_err(dev, "failed to create Display Port PHY\n");
 102                 return PTR_ERR(phy);
 103         }
 104         phy_set_drvdata(phy, state);
 105
 106         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 107
 108         return PTR_ERR_OR_ZERO(phy_provider);
 109 }
 110
 111 static struct platform_driver exynos_dp_video_phy_driver = {
 112         .probe  = exynos_dp_video_phy_probe,
 113         .driver = {
 114                 .name   = "exynos-dp-video-phy",
 115                 .of_match_table = exynos_dp_video_phy_of_match,
 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");