renesas-usb-vbus-regulator.c

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