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 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