linux/drivers/phy/phy-exynos-dp-video.c
<<
>>
Prefs
   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 void exynos_dp_video_phy_pwr_isol(struct exynos_dp_video_phy *state,
  34                                                        unsigned int on)
  35{
  36        unsigned int val;
  37
  38        if (IS_ERR(state->regs))
  39                return;
  40
  41        val = on ? 0 : EXYNOS5_PHY_ENABLE;
  42
  43        regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
  44                           EXYNOS5_PHY_ENABLE, val);
  45}
  46
  47static int exynos_dp_video_phy_power_on(struct phy *phy)
  48{
  49        struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  50
  51        /* Disable power isolation on DP-PHY */
  52        exynos_dp_video_phy_pwr_isol(state, 0);
  53
  54        return 0;
  55}
  56
  57static int exynos_dp_video_phy_power_off(struct phy *phy)
  58{
  59        struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
  60
  61        /* Enable power isolation on DP-PHY */
  62        exynos_dp_video_phy_pwr_isol(state, 1);
  63
  64        return 0;
  65}
  66
  67static struct phy_ops exynos_dp_video_phy_ops = {
  68        .power_on       = exynos_dp_video_phy_power_on,
  69        .power_off      = exynos_dp_video_phy_power_off,
  70        .owner          = THIS_MODULE,
  71};
  72
  73static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
  74        .phy_ctrl_offset        = EXYNOS5_DPTX_PHY_CONTROL,
  75};
  76
  77static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
  78        .phy_ctrl_offset        = EXYNOS5420_DPTX_PHY_CONTROL,
  79};
  80
  81static const struct of_device_id exynos_dp_video_phy_of_match[] = {
  82        {
  83                .compatible = "samsung,exynos5250-dp-video-phy",
  84                .data = &exynos5250_dp_video_phy,
  85        }, {
  86                .compatible = "samsung,exynos5420-dp-video-phy",
  87                .data = &exynos5420_dp_video_phy,
  88        },
  89        { },
  90};
  91MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
  92
  93static int exynos_dp_video_phy_probe(struct platform_device *pdev)
  94{
  95        struct exynos_dp_video_phy *state;
  96        struct device *dev = &pdev->dev;
  97        const struct of_device_id *match;
  98        struct phy_provider *phy_provider;
  99        struct phy *phy;
 100
 101        state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
 102        if (!state)
 103                return -ENOMEM;
 104
 105        state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
 106                                                      "samsung,pmu-syscon");
 107        if (IS_ERR(state->regs)) {
 108                dev_err(dev, "Failed to lookup PMU regmap\n");
 109                return PTR_ERR(state->regs);
 110        }
 111
 112        match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node);
 113        state->drvdata = match->data;
 114
 115        phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
 116        if (IS_ERR(phy)) {
 117                dev_err(dev, "failed to create Display Port PHY\n");
 118                return PTR_ERR(phy);
 119        }
 120        phy_set_drvdata(phy, state);
 121
 122        phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 123
 124        return PTR_ERR_OR_ZERO(phy_provider);
 125}
 126
 127static struct platform_driver exynos_dp_video_phy_driver = {
 128        .probe  = exynos_dp_video_phy_probe,
 129        .driver = {
 130                .name   = "exynos-dp-video-phy",
 131                .of_match_table = exynos_dp_video_phy_of_match,
 132        }
 133};
 134module_platform_driver(exynos_dp_video_phy_driver);
 135
 136MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 137MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver");
 138MODULE_LICENSE("GPL v2");
 139
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.