Quelle  phy-exynos-dp-video.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Samsung Exynos SoC series Display Port PHY driver
 *
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 * Author: Jingoo Han <jg1.han@samsung.com>
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/soc/samsung/exynos-regs-pmu.h>

struct exynos_dp_video_phy_drvdata {
 u32 phy_ctrl_offset;
};

struct exynos_dp_video_phy {
 struct regmap *regs;
 const struct exynos_dp_video_phy_drvdata *drvdata;
};

static int exynos_dp_video_phy_power_on(struct phy *phy)
{
 struct exynos_dp_video_phy *state = phy_get_drvdata(phy);

 /* Disable power isolation on DP-PHY */
 return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
      EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
}

static int exynos_dp_video_phy_power_off(struct phy *phy)
{
 struct exynos_dp_video_phy *state = phy_get_drvdata(phy);

 /* Enable power isolation on DP-PHY */
 return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
      EXYNOS4_PHY_ENABLE, 0);
}

static const struct phy_ops exynos_dp_video_phy_ops = {
 .power_on = exynos_dp_video_phy_power_on,
 .power_off = exynos_dp_video_phy_power_off,
 .owner  = THIS_MODULE,
};

static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
 .phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL,
};

static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
 .phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL,
};

static const struct of_device_id exynos_dp_video_phy_of_match[] = {
 {
  .compatible = "samsung,exynos5250-dp-video-phy",
  .data = &exynos5250_dp_video_phy,
 }, {
  .compatible = "samsung,exynos5420-dp-video-phy",
  .data = &exynos5420_dp_video_phy,
 },
 { },
};
MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);

static int exynos_dp_video_phy_probe(struct platform_device *pdev)
{
 struct exynos_dp_video_phy *state;
 struct device *dev = &pdev->dev;
 struct phy_provider *phy_provider;
 struct phy *phy;

 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
 if (!state)
  return -ENOMEM;

 state->regs = syscon_node_to_regmap(dev->parent->of_node);
 if (IS_ERR(state->regs))
  /* Backwards compatible way */
  state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
             "samsung,pmu-syscon");
 if (IS_ERR(state->regs)) {
  dev_err(dev, "Failed to lookup PMU regmap\n");
  return PTR_ERR(state->regs);
 }

 state->drvdata = of_device_get_match_data(dev);

 phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
 if (IS_ERR(phy)) {
  dev_err(dev, "failed to create Display Port PHY\n");
  return PTR_ERR(phy);
 }
 phy_set_drvdata(phy, state);

 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);

 return PTR_ERR_OR_ZERO(phy_provider);
}

static struct platform_driver exynos_dp_video_phy_driver = {
 .probe = exynos_dp_video_phy_probe,
 .driver = {
  .name = "exynos-dp-video-phy",
  .of_match_table = exynos_dp_video_phy_of_match,
  .suppress_bind_attrs = true,
 }
};
module_platform_driver(exynos_dp_video_phy_driver);

MODULE_AUTHOR("Jingoo Han ");
MODULE_DESCRIPTION("Samsung Exynos SoC DP PHY driver");
MODULE_LICENSE("GPL v2");