LXR linux/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
  24struct exynos_dp_video_phy_drvdata {
  25        u32 phy_ctrl_offset;
  26};
  27
  28struct exynos_dp_video_phy {
  29        struct regmap *regs;
  30        const struct exynos_dp_video_phy_drvdata *drvdata;
  31};
  32
  33static 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
  42static 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
  51static 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
  57static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
  58        .phy_ctrl_offset        = EXYNOS5_DPTX_PHY_CONTROL,
  59};
  60
  61static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
  62        .phy_ctrl_offset        = EXYNOS5420_DPTX_PHY_CONTROL,
  63};
  64
  65static 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};
  75MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
  76
  77static 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
 111static 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};
 118module_platform_driver(exynos_dp_video_phy_driver);
 119
 120MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 121MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
 122MODULE_LICENSE("GPL v2");
 123