Quelle  phy-mtk-hdmi.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2018 MediaTek Inc.
 * Author: Jie Qiu <jie.qiu@mediatek.com>
 */

#include "phy-mtk-hdmi.h"

static int mtk_hdmi_phy_power_on(struct phy *phy);
static int mtk_hdmi_phy_power_off(struct phy *phy);
static int mtk_hdmi_phy_configure(struct phy *phy, union phy_configure_opts *opts);

static const struct phy_ops mtk_hdmi_phy_dev_ops = {
 .power_on = mtk_hdmi_phy_power_on,
 .power_off = mtk_hdmi_phy_power_off,
 .configure = mtk_hdmi_phy_configure,
 .owner = THIS_MODULE,
};

inline struct mtk_hdmi_phy *to_mtk_hdmi_phy(struct clk_hw *hw)
{
 return container_of(hw, struct mtk_hdmi_phy, pll_hw);
}

static int mtk_hdmi_phy_power_on(struct phy *phy)
{
 struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
 int ret;

 ret = clk_prepare_enable(hdmi_phy->pll);
 if (ret < 0)
  return ret;

 hdmi_phy->conf->hdmi_phy_enable_tmds(hdmi_phy);
 return 0;
}

static int mtk_hdmi_phy_power_off(struct phy *phy)
{
 struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);

 hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);
 clk_disable_unprepare(hdmi_phy->pll);

 return 0;
}

static int mtk_hdmi_phy_configure(struct phy *phy, union phy_configure_opts *opts)
{
 struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);

 if (hdmi_phy->conf->hdmi_phy_configure)
  return hdmi_phy->conf->hdmi_phy_configure(phy, opts);

 return 0;
}

static const struct phy_ops *
mtk_hdmi_phy_dev_get_ops(const struct mtk_hdmi_phy *hdmi_phy)
{
 if (hdmi_phy && hdmi_phy->conf &&
     hdmi_phy->conf->hdmi_phy_enable_tmds &&
     hdmi_phy->conf->hdmi_phy_disable_tmds)
  return &mtk_hdmi_phy_dev_ops;

 if (hdmi_phy)
  dev_err(hdmi_phy->dev, "Failed to get dev ops of phy\n");
 return NULL;
}

static void mtk_hdmi_phy_clk_get_data(struct mtk_hdmi_phy *hdmi_phy,
          struct clk_init_data *clk_init)
{
 clk_init->flags = hdmi_phy->conf->flags;
 clk_init->ops = hdmi_phy->conf->hdmi_phy_clk_ops;
}

static int mtk_hdmi_phy_register_regulators(struct mtk_hdmi_phy *hdmi_phy)
{
 const struct regulator_desc *vreg_desc = hdmi_phy->conf->hdmi_phy_regulator_desc;
 const struct regulator_init_data vreg_init_data = {
  .constraints = {
   .valid_ops_mask = REGULATOR_CHANGE_STATUS,
  }
 };
 struct regulator_config vreg_config = {
  .dev = hdmi_phy->dev,
  .driver_data = hdmi_phy,
  .init_data = &vreg_init_data,
  .of_node = hdmi_phy->dev->of_node
 };

 hdmi_phy->rdev = devm_regulator_register(hdmi_phy->dev, vreg_desc, &vreg_config);
 if (IS_ERR(hdmi_phy->rdev))
  return PTR_ERR(hdmi_phy->rdev);

 return 0;
}

static int mtk_hdmi_phy_probe(struct platform_device *pdev)
{
 struct device *dev = &pdev->dev;
 struct mtk_hdmi_phy *hdmi_phy;
 struct clk *ref_clk;
 const char *ref_clk_name;
 struct clk_init_data clk_init = {
  .num_parents = 1,
  .parent_names = (const char * const *)&ref_clk_name,
 };

 struct phy *phy;
 struct phy_provider *phy_provider;
 int ret;

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

 hdmi_phy->regs = devm_platform_ioremap_resource(pdev, 0);
 if (IS_ERR(hdmi_phy->regs))
  return PTR_ERR(hdmi_phy->regs);

 ref_clk = devm_clk_get(dev, "pll_ref");
 if (IS_ERR(ref_clk))
  return dev_err_probe(dev, PTR_ERR(ref_clk),
         "Failed to get PLL reference clock\n");

 ref_clk_name = __clk_get_name(ref_clk);

 ret = of_property_read_string(dev->of_node, "clock-output-names",
          &clk_init.name);
 if (ret < 0)
  return dev_err_probe(dev, ret, "Failed to read clock-output-names\n");

 hdmi_phy->dev = dev;
 hdmi_phy->conf =
  (struct mtk_hdmi_phy_conf *)of_device_get_match_data(dev);
 mtk_hdmi_phy_clk_get_data(hdmi_phy, &clk_init);
 hdmi_phy->pll_hw.init = &clk_init;
 hdmi_phy->pll = devm_clk_register(dev, &hdmi_phy->pll_hw);
 if (IS_ERR(hdmi_phy->pll))
  return dev_err_probe(dev, PTR_ERR(hdmi_phy->pll),
        "Failed to register PLL\n");

 ret = of_property_read_u32(dev->of_node, "mediatek,ibias",
       &hdmi_phy->ibias);
 if (ret < 0)
  return dev_err_probe(dev, ret, "Failed to get ibias\n");

 ret = of_property_read_u32(dev->of_node, "mediatek,ibias_up",
       &hdmi_phy->ibias_up);
 if (ret < 0)
  return dev_err_probe(dev, ret, "Failed to get ibias_up\n");

 dev_info(dev, "Using default TX DRV impedance: 4.2k/36\n");
 hdmi_phy->drv_imp_clk = 0x30;
 hdmi_phy->drv_imp_d2 = 0x30;
 hdmi_phy->drv_imp_d1 = 0x30;
 hdmi_phy->drv_imp_d0 = 0x30;

 phy = devm_phy_create(dev, NULL, mtk_hdmi_phy_dev_get_ops(hdmi_phy));
 if (IS_ERR(phy))
  return dev_err_probe(dev, PTR_ERR(phy), "Cannot create HDMI PHY\n");

 phy_set_drvdata(phy, hdmi_phy);

 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 if (IS_ERR(phy_provider))
  return dev_err_probe(dev, PTR_ERR(phy_provider),
         "Failed to register HDMI PHY\n");

 if (hdmi_phy->conf->pll_default_off)
  hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);

 if (hdmi_phy->conf->hdmi_phy_regulator_desc) {
  ret = mtk_hdmi_phy_register_regulators(hdmi_phy);
  if (ret)
   return ret;
 }

 return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
       hdmi_phy->pll);
}

static const struct of_device_id mtk_hdmi_phy_match[] = {
 { .compatible = "mediatek,mt2701-hdmi-phy",
   .data = &mtk_hdmi_phy_2701_conf,
 },
 { .compatible = "mediatek,mt8173-hdmi-phy",
   .data = &mtk_hdmi_phy_8173_conf,
 },
 { .compatible = "mediatek,mt8195-hdmi-phy",
   .data = &mtk_hdmi_phy_8195_conf,
 },
 {},
};
MODULE_DEVICE_TABLE(of, mtk_hdmi_phy_match);

static struct platform_driver mtk_hdmi_phy_driver = {
 .probe = mtk_hdmi_phy_probe,
 .driver = {
  .name = "mediatek-hdmi-phy",
  .of_match_table = mtk_hdmi_phy_match,
 },
};
module_platform_driver(mtk_hdmi_phy_driver);

MODULE_DESCRIPTION("MediaTek HDMI PHY Driver");
MODULE_LICENSE("GPL v2");