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