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

   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/of_address.h>
  16 #include <linux/of_device.h>
  17 #include <linux/phy/phy.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/soc/samsung/exynos-regs-pmu.h>
  21
  22 struct exynos_dp_video_phy_drvdata {
  23         u32 phy_ctrl_offset;
  24 };
  25
  26 struct exynos_dp_video_phy {
  27         struct regmap *regs;
  28         const struct exynos_dp_video_phy_drvdata *drvdata;
  29 };
  30
  31 static int exynos_dp_video_phy_power_on(struct phy *phy)
  32 {
  33         struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  34
  35         /* Disable power isolation on DP-PHY */
  36         return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
  37                                   EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
  38 }
  39
  40 static int exynos_dp_video_phy_power_off(struct phy *phy)
  41 {
  42         struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  43
  44         /* Enable power isolation on DP-PHY */
  45         return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
  46                                   EXYNOS4_PHY_ENABLE, 0);
  47 }
  48
  49 static const struct phy_ops exynos_dp_video_phy_ops = {
  50         .power_on       = exynos_dp_video_phy_power_on,
  51         .power_off      = exynos_dp_video_phy_power_off,
  52         .owner          = THIS_MODULE,
  53 };
  54
  55 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
  56         .phy_ctrl_offset        = EXYNOS5_DPTX_PHY_CONTROL,
  57 };
  58
  59 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
  60         .phy_ctrl_offset        = EXYNOS5420_DPTX_PHY_CONTROL,
  61 };
  62
  63 static const struct of_device_id exynos_dp_video_phy_of_match[] = {
  64         {
  65                 .compatible = "samsung,exynos5250-dp-video-phy",
  66                 .data = &exynos5250_dp_video_phy,
  67         }, {
  68                 .compatible = "samsung,exynos5420-dp-video-phy",
  69                 .data = &exynos5420_dp_video_phy,
  70         },
  71         { },
  72 };
  73 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
  74
  75 static int exynos_dp_video_phy_probe(struct platform_device *pdev)
  76 {
  77         struct exynos_dp_video_phy *state;
  78         struct device *dev = &pdev->dev;
  79         struct phy_provider *phy_provider;
  80         struct phy *phy;
  81
  82         state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
  83         if (!state)
  84                 return -ENOMEM;
  85
  86         state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
  87                                                       "samsung,pmu-syscon");
  88         if (IS_ERR(state->regs)) {
  89                 dev_err(dev, "Failed to lookup PMU regmap\n");
  90                 return PTR_ERR(state->regs);
  91         }
  92
  93         state->drvdata = of_device_get_match_data(dev);
  94
  95         phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
  96         if (IS_ERR(phy)) {
  97                 dev_err(dev, "failed to create Display Port PHY\n");
  98                 return PTR_ERR(phy);
  99         }
 100         phy_set_drvdata(phy, state);
 101
 102         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 103
 104         return PTR_ERR_OR_ZERO(phy_provider);
 105 }
 106
 107 static struct platform_driver exynos_dp_video_phy_driver = {
 108         .probe  = exynos_dp_video_phy_probe,
 109         .driver = {
 110                 .name   = "exynos-dp-video-phy",
 111                 .of_match_table = exynos_dp_video_phy_of_match,
 112         }
 113 };
 114 module_platform_driver(exynos_dp_video_phy_driver);
 115
 116 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 117 MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
 118 MODULE_LICENSE("GPL v2");