drivers/phy/mediatek/phy-mtk-hdmi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018 MediaTek Inc.
   4  * Author: Jie Qiu <jie.qiu@mediatek.com>
   5  */
   6
   7 #include "phy-mtk-hdmi.h"
   8
   9 static int mtk_hdmi_phy_power_on(struct phy *phy);
  10 static int mtk_hdmi_phy_power_off(struct phy *phy);
  11 static int mtk_hdmi_phy_configure(struct phy *phy, union phy_configure_opts *opts);
  12
  13 static const struct phy_ops mtk_hdmi_phy_dev_ops = {
  14         .power_on = mtk_hdmi_phy_power_on,
  15         .power_off = mtk_hdmi_phy_power_off,
  16         .configure = mtk_hdmi_phy_configure,
  17         .owner = THIS_MODULE,
  18 };
  19
  20 inline struct mtk_hdmi_phy *to_mtk_hdmi_phy(struct clk_hw *hw)
  21 {
  22         return container_of(hw, struct mtk_hdmi_phy, pll_hw);
  23 }
  24
  25 static int mtk_hdmi_phy_power_on(struct phy *phy)
  26 {
  27         struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
  28         int ret;
  29
  30         ret = clk_prepare_enable(hdmi_phy->pll);
  31         if (ret < 0)
  32                 return ret;
  33
  34         hdmi_phy->conf->hdmi_phy_enable_tmds(hdmi_phy);
  35         return 0;
  36 }
  37
  38 static int mtk_hdmi_phy_power_off(struct phy *phy)
  39 {
  40         struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
  41
  42         hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);
  43         clk_disable_unprepare(hdmi_phy->pll);
  44
  45         return 0;
  46 }
  47
  48 static int mtk_hdmi_phy_configure(struct phy *phy, union phy_configure_opts *opts)
  49 {
  50         struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
  51
  52         if (hdmi_phy->conf->hdmi_phy_configure)
  53                 return hdmi_phy->conf->hdmi_phy_configure(phy, opts);
  54
  55         return 0;
  56 }
  57
  58 static const struct phy_ops *
  59 mtk_hdmi_phy_dev_get_ops(const struct mtk_hdmi_phy *hdmi_phy)
  60 {
  61         if (hdmi_phy && hdmi_phy->conf &&
  62             hdmi_phy->conf->hdmi_phy_enable_tmds &&
  63             hdmi_phy->conf->hdmi_phy_disable_tmds)
  64                 return &mtk_hdmi_phy_dev_ops;
  65
  66         if (hdmi_phy)
  67                 dev_err(hdmi_phy->dev, "Failed to get dev ops of phy\n");
  68         return NULL;
  69 }
  70
  71 static void mtk_hdmi_phy_clk_get_data(struct mtk_hdmi_phy *hdmi_phy,
  72                                       struct clk_init_data *clk_init)
  73 {
  74         clk_init->flags = hdmi_phy->conf->flags;
  75         clk_init->ops = hdmi_phy->conf->hdmi_phy_clk_ops;
  76 }
  77
  78 static int mtk_hdmi_phy_probe(struct platform_device *pdev)
  79 {
  80         struct device *dev = &pdev->dev;
  81         struct mtk_hdmi_phy *hdmi_phy;
  82         struct clk *ref_clk;
  83         const char *ref_clk_name;
  84         struct clk_init_data clk_init = {
  85                 .num_parents = 1,
  86                 .parent_names = (const char * const *)&ref_clk_name,
  87         };
  88
  89         struct phy *phy;
  90         struct phy_provider *phy_provider;
  91         int ret;
  92
  93         hdmi_phy = devm_kzalloc(dev, sizeof(*hdmi_phy), GFP_KERNEL);
  94         if (!hdmi_phy)
  95                 return -ENOMEM;
  96
  97         hdmi_phy->regs = devm_platform_ioremap_resource(pdev, 0);
  98         if (IS_ERR(hdmi_phy->regs))
  99                 return PTR_ERR(hdmi_phy->regs);
 100
 101         ref_clk = devm_clk_get(dev, "pll_ref");
 102         if (IS_ERR(ref_clk))
 103                 return dev_err_probe(dev, PTR_ERR(ref_clk),
 104                                      "Failed to get PLL reference clock\n");
 105
 106         ref_clk_name = __clk_get_name(ref_clk);
 107
 108         ret = of_property_read_string(dev->of_node, "clock-output-names",
 109                                       &clk_init.name);
 110         if (ret < 0)
 111                 return dev_err_probe(dev, ret, "Failed to read clock-output-names\n");
 112
 113         hdmi_phy->dev = dev;
 114         hdmi_phy->conf =
 115                 (struct mtk_hdmi_phy_conf *)of_device_get_match_data(dev);
 116         mtk_hdmi_phy_clk_get_data(hdmi_phy, &clk_init);
 117         hdmi_phy->pll_hw.init = &clk_init;
 118         hdmi_phy->pll = devm_clk_register(dev, &hdmi_phy->pll_hw);
 119         if (IS_ERR(hdmi_phy->pll))
 120                 return dev_err_probe(dev, PTR_ERR(hdmi_phy->pll),
 121                                     "Failed to register PLL\n");
 122
 123         ret = of_property_read_u32(dev->of_node, "mediatek,ibias",
 124                                    &hdmi_phy->ibias);
 125         if (ret < 0)
 126                 return dev_err_probe(dev, ret, "Failed to get ibias\n");
 127
 128         ret = of_property_read_u32(dev->of_node, "mediatek,ibias_up",
 129                                    &hdmi_phy->ibias_up);
 130         if (ret < 0)
 131                 return dev_err_probe(dev, ret, "Failed to get ibias_up\n");
 132
 133         dev_info(dev, "Using default TX DRV impedance: 4.2k/36\n");
 134         hdmi_phy->drv_imp_clk = 0x30;
 135         hdmi_phy->drv_imp_d2 = 0x30;
 136         hdmi_phy->drv_imp_d1 = 0x30;
 137         hdmi_phy->drv_imp_d0 = 0x30;
 138
 139         phy = devm_phy_create(dev, NULL, mtk_hdmi_phy_dev_get_ops(hdmi_phy));
 140         if (IS_ERR(phy))
 141                 return dev_err_probe(dev, PTR_ERR(phy), "Cannot create HDMI PHY\n");
 142
 143         phy_set_drvdata(phy, hdmi_phy);
 144
 145         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 146         if (IS_ERR(phy_provider))
 147                 return dev_err_probe(dev, PTR_ERR(phy_provider),
 148                                      "Failed to register HDMI PHY\n");
 149
 150         if (hdmi_phy->conf->pll_default_off)
 151                 hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);
 152
 153         return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
 154                                    hdmi_phy->pll);
 155 }
 156
 157 static const struct of_device_id mtk_hdmi_phy_match[] = {
 158         { .compatible = "mediatek,mt2701-hdmi-phy",
 159           .data = &mtk_hdmi_phy_2701_conf,
 160         },
 161         { .compatible = "mediatek,mt8173-hdmi-phy",
 162           .data = &mtk_hdmi_phy_8173_conf,
 163         },
 164         { .compatible = "mediatek,mt8195-hdmi-phy",
 165           .data = &mtk_hdmi_phy_8195_conf,
 166         },
 167         {},
 168 };
 169 MODULE_DEVICE_TABLE(of, mtk_hdmi_phy_match);
 170
 171 static struct platform_driver mtk_hdmi_phy_driver = {
 172         .probe = mtk_hdmi_phy_probe,
 173         .driver = {
 174                 .name = "mediatek-hdmi-phy",
 175                 .of_match_table = mtk_hdmi_phy_match,
 176         },
 177 };
 178 module_platform_driver(mtk_hdmi_phy_driver);
 179
 180 MODULE_DESCRIPTION("MediaTek HDMI PHY Driver");
 181 MODULE_LICENSE("GPL v2");