phy/samsung/phy-exynos-dp-video.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Samsung Exynos SoC series Display Port PHY driver
0004  *
0005  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
0006  * Author: Jingoo Han <jg1.han@samsung.com>
0007  */
0008
0009 #include <linux/err.h>
0010 #include <linux/io.h>
0011 #include <linux/kernel.h>
0012 #include <linux/module.h>
0013 #include <linux/mfd/syscon.h>
0014 #include <linux/of.h>
0015 #include <linux/of_address.h>
0016 #include <linux/of_device.h>
0017 #include <linux/phy/phy.h>
0018 #include <linux/platform_device.h>
0019 #include <linux/regmap.h>
0020 #include <linux/soc/samsung/exynos-regs-pmu.h>
0021
0022 struct exynos_dp_video_phy_drvdata {
0023     u32 phy_ctrl_offset;
0024 };
0025
0026 struct exynos_dp_video_phy {
0027     struct regmap *regs;
0028     const struct exynos_dp_video_phy_drvdata *drvdata;
0029 };
0030
0031 static int exynos_dp_video_phy_power_on(struct phy *phy)
0032 {
0033     struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
0034
0035     /* Disable power isolation on DP-PHY */
0036     return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
0037                   EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
0038 }
0039
0040 static int exynos_dp_video_phy_power_off(struct phy *phy)
0041 {
0042     struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
0043
0044     /* Enable power isolation on DP-PHY */
0045     return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
0046                   EXYNOS4_PHY_ENABLE, 0);
0047 }
0048
0049 static const struct phy_ops exynos_dp_video_phy_ops = {
0050     .power_on   = exynos_dp_video_phy_power_on,
0051     .power_off  = exynos_dp_video_phy_power_off,
0052     .owner      = THIS_MODULE,
0053 };
0054
0055 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
0056     .phy_ctrl_offset    = EXYNOS5_DPTX_PHY_CONTROL,
0057 };
0058
0059 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
0060     .phy_ctrl_offset    = EXYNOS5420_DPTX_PHY_CONTROL,
0061 };
0062
0063 static const struct of_device_id exynos_dp_video_phy_of_match[] = {
0064     {
0065         .compatible = "samsung,exynos5250-dp-video-phy",
0066         .data = &exynos5250_dp_video_phy,
0067     }, {
0068         .compatible = "samsung,exynos5420-dp-video-phy",
0069         .data = &exynos5420_dp_video_phy,
0070     },
0071     { },
0072 };
0073 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
0074
0075 static int exynos_dp_video_phy_probe(struct platform_device *pdev)
0076 {
0077     struct exynos_dp_video_phy *state;
0078     struct device *dev = &pdev->dev;
0079     struct phy_provider *phy_provider;
0080     struct phy *phy;
0081
0082     state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
0083     if (!state)
0084         return -ENOMEM;
0085
0086     state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
0087                               "samsung,pmu-syscon");
0088     if (IS_ERR(state->regs)) {
0089         dev_err(dev, "Failed to lookup PMU regmap\n");
0090         return PTR_ERR(state->regs);
0091     }
0092
0093     state->drvdata = of_device_get_match_data(dev);
0094
0095     phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
0096     if (IS_ERR(phy)) {
0097         dev_err(dev, "failed to create Display Port PHY\n");
0098         return PTR_ERR(phy);
0099     }
0100     phy_set_drvdata(phy, state);
0101
0102     phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
0103
0104     return PTR_ERR_OR_ZERO(phy_provider);
0105 }
0106
0107 static struct platform_driver exynos_dp_video_phy_driver = {
0108     .probe  = exynos_dp_video_phy_probe,
0109     .driver = {
0110         .name   = "exynos-dp-video-phy",
0111         .of_match_table = exynos_dp_video_phy_of_match,
0112         .suppress_bind_attrs = true,
0113     }
0114 };
0115 module_platform_driver(exynos_dp_video_phy_driver);
0116
0117 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
0118 MODULE_DESCRIPTION("Samsung Exynos SoC DP PHY driver");
0119 MODULE_LICENSE("GPL v2");