drivers/regulator/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/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         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
  60 static 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 };
  67 module_platform_driver(rzg2l_usb_vbus_regulator_driver);
  68
  69 MODULE_AUTHOR("Biju Das <[email protected]>");
  70 MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver");
  71 MODULE_LICENSE("GPL");