drivers/sysreset/sysreset_watchdog.c

   1 /*
   2  * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <sysreset.h>
  11 #include <wdt.h>
  12
  13 struct wdt_reboot_priv {
  14         struct udevice *wdt;
  15 };
  16
  17 static int wdt_reboot_request(struct udevice *dev, enum sysreset_t type)
  18 {
  19         struct wdt_reboot_priv *priv = dev_get_priv(dev);
  20         int ret;
  21
  22         ret = wdt_expire_now(priv->wdt, 0);
  23         if (ret)
  24                 return ret;
  25
  26         return -EINPROGRESS;
  27 }
  28
  29 static struct sysreset_ops wdt_reboot_ops = {
  30         .request = wdt_reboot_request,
  31 };
  32
  33 int wdt_reboot_probe(struct udevice *dev)
  34 {
  35         struct wdt_reboot_priv *priv = dev_get_priv(dev);
  36         int err;
  37
  38         err = uclass_get_device_by_phandle(UCLASS_WDT, dev,
  39                                            "wdt", &priv->wdt);
  40         if (err) {
  41                 pr_err("unable to find wdt device\n");
  42                 return err;
  43         }
  44
  45         return 0;
  46 }
  47
  48 static const struct udevice_id wdt_reboot_ids[] = {
  49         { .compatible = "wdt-reboot" },
  50         { /* sentinel */ }
  51 };
  52
  53 U_BOOT_DRIVER(wdt_reboot) = {
  54         .name = "wdt_reboot",
  55         .id = UCLASS_SYSRESET,
  56         .of_match = wdt_reboot_ids,
  57         .ops = &wdt_reboot_ops,
  58         .priv_auto_alloc_size = sizeof(struct wdt_reboot_priv),
  59         .probe = wdt_reboot_probe,
  60 };