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/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
  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
  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
  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");