// SPDX-License-Identifier: GPL-2.0
//
// Renesas USB VBUS output regulator driver
//
// Copyright (C) 2024 Renesas Electronics Corporation
//

#include <linux/module.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>

static const struct regulator_ops rzg2l_usb_vbus_reg_ops = {
        .enable     = regulator_enable_regmap,
        .disable    = regulator_disable_regmap,
        .is_enabled = regulator_is_enabled_regmap,
};

static const struct regulator_desc rzg2l_usb_vbus_rdesc = {
        .name = "vbus",
        .of_match = of_match_ptr("regulator-vbus"),
        .ops = &rzg2l_usb_vbus_reg_ops,
        .type = REGULATOR_VOLTAGE,
        .owner = THIS_MODULE,
        .enable_reg  = 0,
        .enable_mask = BIT(0),
        .enable_is_inverted = true,
        .fixed_uV       = 5000000,
        .n_voltages     = 1,
};

static int rzg2l_usb_vbus_regulator_probe(struct platform_device *pdev)
{
        struct regulator_config config = { };
        struct device *dev = &pdev->dev;
        struct regulator_dev *rdev;

        config.regmap = dev_get_regmap(dev->parent, NULL);
        if (!config.regmap)
                return dev_err_probe(dev, -ENOENT, "Failed to get regmap\n");

        config.dev = dev;
        config.of_node = of_get_child_by_name(dev->parent->of_node, "regulator-vbus");
        if (!config.of_node)
                return dev_err_probe(dev, -ENODEV, "regulator node not found\n");

        rdev = devm_regulator_register(dev, &rzg2l_usb_vbus_rdesc, &config);
        of_node_put(config.of_node);
        if (IS_ERR(rdev))
                return dev_err_probe(dev, PTR_ERR(rdev),
                                     "not able to register vbus regulator\n");

        return 0;
}

static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
        .probe = rzg2l_usb_vbus_regulator_probe,
        .driver = {
                .name = "rzg2l-usb-vbus-regulator",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
        },
};
module_platform_driver(rzg2l_usb_vbus_regulator_driver);

MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver");
MODULE_LICENSE("GPL");