LXR linux/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
  25struct exynos_dp_video_phy_drvdata {
  26        u32 phy_ctrl_offset;
  27};
  28
  29struct exynos_dp_video_phy {
  30        struct regmap *regs;
  31        const struct exynos_dp_video_phy_drvdata *drvdata;
  32};
  33
  34static 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
  43static 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
  52static 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
  58static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
  59        .phy_ctrl_offset        = EXYNOS5_DPTX_PHY_CONTROL,
  60};
  61
  62static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
  63        .phy_ctrl_offset        = EXYNOS5420_DPTX_PHY_CONTROL,
  64};
  65
  66static 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};
  76MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
  77
  78static 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
 110static 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};
 117module_platform_driver(exynos_dp_video_phy_driver);
 118
 119MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 120MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
 121MODULE_LICENSE("GPL v2");
 122