common/usb_onboard_hub.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for onboard USB hubs
   4  *
   5  * Copyright (C) 2022, STMicroelectronics - All Rights Reserved
   6  *
   7  * Mostly inspired by Linux kernel v6.1 onboard_usb_hub driver
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <dm/device_compat.h>
  13 #include <power/regulator.h>
  14
  15 struct onboard_hub {
  16         struct udevice *vdd;
  17 };
  18
  19 static int usb_onboard_hub_probe(struct udevice *dev)
  20 {
  21         struct onboard_hub *hub = dev_get_priv(dev);
  22         int ret;
  23
  24         ret = device_get_supply_regulator(dev, "vdd-supply", &hub->vdd);
  25         if (ret) {
  26                 dev_err(dev, "can't get vdd-supply: %d\n", ret);
  27                 return ret;
  28         }
  29
  30         ret = regulator_set_enable_if_allowed(hub->vdd, true);
  31         if (ret)
  32                 dev_err(dev, "can't enable vdd-supply: %d\n", ret);
  33
  34         return ret;
  35 }
  36
  37 static int usb_onboard_hub_remove(struct udevice *dev)
  38 {
  39         struct onboard_hub *hub = dev_get_priv(dev);
  40         int ret;
  41
  42         ret = regulator_set_enable_if_allowed(hub->vdd, false);
  43         if (ret)
  44                 dev_err(dev, "can't disable vdd-supply: %d\n", ret);
  45
  46         return ret;
  47 }
  48
  49 static const struct udevice_id usb_onboard_hub_ids[] = {
  50         /* Use generic usbVID,PID dt-bindings (usb-device.yaml) */
  51         { .compatible = "usb424,2514" }, /* USB2514B USB 2.0 */
  52         { }
  53 };
  54
  55 U_BOOT_DRIVER(usb_onboard_hub) = {
  56         .name   = "usb_onboard_hub",
  57         .id     = UCLASS_USB_HUB,
  58         .probe = usb_onboard_hub_probe,
  59         .remove = usb_onboard_hub_remove,
  60         .of_match = usb_onboard_hub_ids,
  61         .priv_auto = sizeof(struct onboard_hub),
  62 };