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
17 static 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
23 static 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
rzg2l_usb_vbus_regulator_probe(struct platform_device * pdev)36 static 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 if (IS_ERR(rdev)) {
53 of_node_put(config.of_node);
54 return dev_err_probe(dev, PTR_ERR(rdev),
55 "not able to register vbus regulator\n");
56 }
57
58 of_node_put(config.of_node);
59
60 return 0;
61 }
62
63 static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
64 .probe = rzg2l_usb_vbus_regulator_probe,
65 .driver = {
66 .name = "rzg2l-usb-vbus-regulator",
67 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
68 },
69 };
70 module_platform_driver(rzg2l_usb_vbus_regulator_driver);
71
72 MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
73 MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver");
74 MODULE_LICENSE("GPL");
75