1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
5 * Derived from linux/drivers/power/reset/syscon-reboot.c:
6 * Copyright (C) 2013, Applied Micro Circuits Corporation
7 * Author: Feng Kan <fkan@apm.com>
17 struct syscon_reboot_priv {
18 struct regmap *regmap;
23 static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
25 struct syscon_reboot_priv *priv = dev_get_priv(dev);
27 if (type == SYSRESET_POWER)
28 return -EPROTONOSUPPORT;
30 regmap_write(priv->regmap, priv->offset, priv->mask);
35 static struct sysreset_ops syscon_reboot_ops = {
36 .request = syscon_reboot_request,
39 int syscon_reboot_probe(struct udevice *dev)
41 struct syscon_reboot_priv *priv = dev_get_priv(dev);
43 priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
44 if (IS_ERR(priv->regmap)) {
45 pr_err("unable to find regmap\n");
49 priv->offset = dev_read_u32_default(dev, "offset", 0);
50 priv->mask = dev_read_u32_default(dev, "mask", 0);
55 static const struct udevice_id syscon_reboot_ids[] = {
56 { .compatible = "syscon-reboot" },
60 U_BOOT_DRIVER(syscon_reboot) = {
61 .name = "syscon_reboot",
62 .id = UCLASS_SYSRESET,
63 .of_match = syscon_reboot_ids,
64 .probe = syscon_reboot_probe,
65 .priv_auto_alloc_size = sizeof(struct syscon_reboot_priv),
66 .ops = &syscon_reboot_ops,