drivers/phy/samsung/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/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_device.h>
  20 #include <linux/phy/phy.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regmap.h>
  23 #include <linux/soc/samsung/exynos-regs-pmu.h>
  24
  25 struct exynos_dp_video_phy_drvdata {
  26         u32 phy_ctrl_offset;
  27 };
  28
  29 struct exynos_dp_video_phy {
  30         struct regmap *regs;
  31         const struct exynos_dp_video_phy_drvdata *drvdata;
  32 };
  33
  34 static int exynos_dp_video_phy_power_on(struct phy *phy)
  35 {
  36         struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  37
  38         /* Disable power isolation on DP-PHY */
  39         return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
  40                                   EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
  41 }
  42
  43 static int exynos_dp_video_phy_power_off(struct phy *phy)
  44 {
  45         struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  46
  47         /* Enable power isolation on DP-PHY */
  48         return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
  49                                   EXYNOS4_PHY_ENABLE, 0);
  50 }
  51
  52 static const struct phy_ops exynos_dp_video_phy_ops = {
  53         .power_on       = exynos_dp_video_phy_power_on,
  54         .power_off      = exynos_dp_video_phy_power_off,
  55         .owner          = THIS_MODULE,
  56 };
  57
  58 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
  59         .phy_ctrl_offset        = EXYNOS5_DPTX_PHY_CONTROL,
  60 };
  61
  62 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
  63         .phy_ctrl_offset        = EXYNOS5420_DPTX_PHY_CONTROL,
  64 };
  65
  66 static const struct of_device_id exynos_dp_video_phy_of_match[] = {
  67         {
  68                 .compatible = "samsung,exynos5250-dp-video-phy",
  69                 .data = &exynos5250_dp_video_phy,
  70         }, {
  71                 .compatible = "samsung,exynos5420-dp-video-phy",
  72                 .data = &exynos5420_dp_video_phy,
  73         },
  74         { },
  75 };
  76 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
  77
  78 static int exynos_dp_video_phy_probe(struct platform_device *pdev)
  79 {
  80         struct exynos_dp_video_phy *state;
  81         struct device *dev = &pdev->dev;
  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         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         }
 116 };
 117 module_platform_driver(exynos_dp_video_phy_driver);
 118
 119 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 120 MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
 121 MODULE_LICENSE("GPL v2");