1// SPDX-License-Identifier: GPL-2.0
 2//
 3// Renesas USB VBUS output regulator driver
 4//
 5// Copyright (C) 2024 Renesas Electronics Corporation
 6//
 7
 8#include <linux/module.h>
 9#include <linux/err.h>
10#include <linux/kernel.h>
11#include <linux/of.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/of_regulator.h>
16
17static const struct regulator_ops rzg2l_usb_vbus_reg_ops = {
18	.enable     = regulator_enable_regmap,
19	.disable    = regulator_disable_regmap,
20	.is_enabled = regulator_is_enabled_regmap,
21};
22
23static const struct regulator_desc rzg2l_usb_vbus_rdesc = {
24	.name = "vbus",
25	.of_match = of_match_ptr("regulator-vbus"),
26	.ops = &rzg2l_usb_vbus_reg_ops,
27	.type = REGULATOR_VOLTAGE,
28	.owner = THIS_MODULE,
29	.enable_reg  = 0,
30	.enable_mask = BIT(0),
31	.enable_is_inverted = true,
32	.fixed_uV	= 5000000,
33	.n_voltages	= 1,
34};
35
36static int rzg2l_usb_vbus_regulator_probe(struct platform_device *pdev)
37{
38	struct regulator_config config = { };
39	struct device *dev = &pdev->dev;
40	struct regulator_dev *rdev;
41
42	config.regmap = dev_get_regmap(dev->parent, NULL);
43	if (!config.regmap)
44		return dev_err_probe(dev, -ENOENT, "Failed to get regmap\n");
45
46	config.dev = dev;
47	config.of_node = of_get_child_by_name(dev->parent->of_node, "regulator-vbus");
48	if (!config.of_node)
49		return dev_err_probe(dev, -ENODEV, "regulator node not found\n");
50
51	rdev = devm_regulator_register(dev, &rzg2l_usb_vbus_rdesc, &config);
52	of_node_put(config.of_node);
53	if (IS_ERR(rdev))
54		return dev_err_probe(dev, PTR_ERR(rdev),
55				     "not able to register vbus regulator\n");
56
57	return 0;
58}
59
60static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
61	.probe = rzg2l_usb_vbus_regulator_probe,
62	.driver	= {
63		.name = "rzg2l-usb-vbus-regulator",
64		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
65	},
66};
67module_platform_driver(rzg2l_usb_vbus_regulator_driver);
68
69MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
70MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver");
71MODULE_LICENSE("GPL");