// SPDX-License-Identifier: GPL-2.0-only
/*
 * Samsung Exynos SoC series Display Port PHY driver
 *
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 * Author: Jingoo Han <jg1.han@samsung.com>
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/soc/samsung/exynos-regs-pmu.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 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 */
        return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
                                  EXYNOS4_PHY_ENABLE, EXYNOS4_PHY_ENABLE);
}

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 */
        return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
                                  EXYNOS4_PHY_ENABLE, 0);
}

static const 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;
        struct phy_provider *phy_provider;
        struct phy *phy;

        state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
        if (!state)
                return -ENOMEM;

        state->regs = syscon_node_to_regmap(dev->parent->of_node);
        if (IS_ERR(state->regs))
                /* Backwards compatible way */
                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);
        }

        state->drvdata = of_device_get_match_data(dev);

        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,
                .suppress_bind_attrs = true,
        }
};
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");