121 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Samsung Exynos SoC series Display Port PHY driver4 *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 20struct exynos_dp_video_phy_drvdata {21 u32 phy_ctrl_offset;22};23 24struct exynos_dp_video_phy {25 struct regmap *regs;26 const struct exynos_dp_video_phy_drvdata *drvdata;27};28 29static 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 38static 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 47static 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 53static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {54 .phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL,55};56 57static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {58 .phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL,59};60 61static 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};71MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);72 73static 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 108static 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};116module_platform_driver(exynos_dp_video_phy_driver);117 118MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");119MODULE_DESCRIPTION("Samsung Exynos SoC DP PHY driver");120MODULE_LICENSE("GPL v2");121