1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Samsung Exynos SoC series Display Port PHY driver 4 * 5 * Copyright (C) 2013 Samsung Electronics Co., Ltd. 6 * Author: Jingoo Han <jg1.han@samsung.com> 7 */ 8 9 #include <linux/err.h> 10 #include <linux/io.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/mfd/syscon.h> 14 #include <linux/of.h> 15 #include <linux/phy/phy.h> 16 #include <linux/platform_device.h> 17 #include <linux/regmap.h> 18 #include <linux/soc/samsung/exynos-regs-pmu.h> 19 20 struct exynos_dp_video_phy_drvdata { 21 u32 phy_ctrl_offset; 22 }; 23 24 struct exynos_dp_video_phy { 25 struct regmap *regs; 26 const struct exynos_dp_video_phy_drvdata *drvdata; 27 }; 28 29 static int exynos_dp_video_phy_power_on(struct phy *phy) 30 { 31 struct exynos_dp_video_phy *state = phy_get_drvdata(phy); 32 33 /* Disable power isolation on DP-PHY */ 34 return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset, 35 EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE); 36 } 37 38 static int exynos_dp_video_phy_power_off(struct phy *phy) 39 { 40 struct exynos_dp_video_phy *state = phy_get_drvdata(phy); 41 42 /* Enable power isolation on DP-PHY */ 43 return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset, 44 EXYNOS4_PHY_ENABLE, 0); 45 } 46 47 static const struct phy_ops exynos_dp_video_phy_ops = { 48 .power_on = exynos_dp_video_phy_power_on, 49 .power_off = exynos_dp_video_phy_power_off, 50 .owner = THIS_MODULE, 51 }; 52 53 static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = { 54 .phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL, 55 }; 56 57 static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = { 58 .phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL, 59 }; 60 61 static const struct of_device_id exynos_dp_video_phy_of_match[] = { 62 { 63 .compatible = "samsung,exynos5250-dp-video-phy", 64 .data = &exynos5250_dp_video_phy, 65 }, { 66 .compatible = "samsung,exynos5420-dp-video-phy", 67 .data = &exynos5420_dp_video_phy, 68 }, 69 { }, 70 }; 71 MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match); 72 73 static int exynos_dp_video_phy_probe(struct platform_device *pdev) 74 { 75 struct exynos_dp_video_phy *state; 76 struct device *dev = &pdev->dev; 77 struct phy_provider *phy_provider; 78 struct phy *phy; 79 80 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); 81 if (!state) 82 return -ENOMEM; 83 84 state->regs = syscon_node_to_regmap(dev->parent->of_node); 85 if (IS_ERR(state->regs)) 86 /* Backwards compatible way */ 87 state->regs = syscon_regmap_lookup_by_phandle(dev->of_node, 88 "samsung,pmu-syscon"); 89 if (IS_ERR(state->regs)) { 90 dev_err(dev, "Failed to lookup PMU regmap\n"); 91 return PTR_ERR(state->regs); 92 } 93 94 state->drvdata = of_device_get_match_data(dev); 95 96 phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops); 97 if (IS_ERR(phy)) { 98 dev_err(dev, "failed to create Display Port PHY\n"); 99 return PTR_ERR(phy); 100 } 101 phy_set_drvdata(phy, state); 102 103 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 104 105 return PTR_ERR_OR_ZERO(phy_provider); 106 } 107 108 static struct platform_driver exynos_dp_video_phy_driver = { 109 .probe = exynos_dp_video_phy_probe, 110 .driver = { 111 .name = "exynos-dp-video-phy", 112 .of_match_table = exynos_dp_video_phy_of_match, 113 .suppress_bind_attrs = true, 114 } 115 }; 116 module_platform_driver(exynos_dp_video_phy_driver); 117 118 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 119 MODULE_DESCRIPTION("Samsung Exynos SoC DP PHY driver"); 120 MODULE_LICENSE("GPL v2"); 121