phy-exynos-dp-video.rar_SOC

/* * Samsung EXYNOS SoC series Display Port PHY driver * * Copyright (C) 2013 Samsung Electronics Co., Ltd. * Author: Jingoo Han <jg1.han@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/err.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mfd/syscon.h> #include <linux/mfd/syscon/exynos5-pmu.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/regmap.h> struct exynos_dp_video_phy_drvdata { u32 phy_ctrl_offset; }; struct exynos_dp_video_phy { struct regmap *regs; const struct exynos_dp_video_phy_drvdata *drvdata; }; static void exynos_dp_video_phy_pwr_isol(struct exynos_dp_video_phy *state, unsigned int on) { unsigned int val; if (IS_ERR(state->regs)) return; val = on ? 0 : EXYNOS5_PHY_ENABLE; regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset, EXYNOS5_PHY_ENABLE, val); } static int exynos_dp_video_phy_power_on(struct phy *phy) { struct exynos_dp_video_phy *state = phy_get_drvdata(phy); /* Disable power isolation on DP-PHY */ exynos_dp_video_phy_pwr_isol(state, 0); return 0; } static int exynos_dp_video_phy_power_off(struct phy *phy) { struct exynos_dp_video_phy *state = phy_get_drvdata(phy); /* Enable power isolation on DP-PHY */ exynos_dp_video_phy_pwr_isol(state, 1); return 0; } static struct phy_ops exynos_dp_video_phy_ops = { .power_on = exynos_dp_video_phy_power_on, .power_off = exynos_dp_video_phy_power_off, .owner = THIS_MODULE, }; static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = { .phy_ctrl_offset = EXYNOS5_DPTX_PHY_CONTROL, }; static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = { .phy_ctrl_offset = EXYNOS5420_DPTX_PHY_CONTROL, }; static const struct of_device_id exynos_dp_video_phy_of_match[] = { { .compatible = "samsung,exynos5250-dp-video-phy", .data = &exynos5250_dp_video_phy, }, { .compatible = "samsung,exynos5420-dp-video-phy", .data = &exynos5420_dp_video_phy, }, { }, }; MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match); static int exynos_dp_video_phy_probe(struct platform_device *pdev) { struct exynos_dp_video_phy *state; struct device *dev = &pdev->dev; const struct of_device_id *match; struct phy_provider *phy_provider; struct phy *phy; state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); if (!state) return -ENOMEM; state->regs = syscon_regmap_lookup_by_phandle(dev->of_node, "samsung,pmu-syscon"); if (IS_ERR(state->regs)) { dev_err(dev, "Failed to lookup PMU regmap\n"); return PTR_ERR(state->regs); } match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node); state->drvdata = match->data; phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops); if (IS_ERR(phy)) { dev_err(dev, "failed to create Display Port PHY\n"); return PTR_ERR(phy); } phy_set_drvdata(phy, state); phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); return PTR_ERR_OR_ZERO(phy_provider); } static struct platform_driver exynos_dp_video_phy_driver = { .probe = exynos_dp_video_phy_probe, .driver = { .name = "exynos-dp-video-phy", .of_match_table = exynos_dp_video_phy_of_match, } }; module_platform_driver(exynos_dp_video_phy_driver); MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver"); MODULE_LICENSE("GPL v2");