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>
16 #include <linux/err.h>
18 struct syscon_reboot_priv {
19 struct regmap *regmap;
24 static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
26 struct syscon_reboot_priv *priv = dev_get_priv(dev);
27 ulong driver_data = dev_get_driver_data(dev);
29 if (type != driver_data)
30 return -EPROTONOSUPPORT;
32 regmap_write(priv->regmap, priv->offset, priv->mask);
37 static struct sysreset_ops syscon_reboot_ops = {
38 .request = syscon_reboot_request,
41 int syscon_reboot_probe(struct udevice *dev)
43 struct syscon_reboot_priv *priv = dev_get_priv(dev);
45 priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
46 if (IS_ERR(priv->regmap)) {
47 pr_err("unable to find regmap\n");
51 priv->offset = dev_read_u32_default(dev, "offset", 0);
52 priv->mask = dev_read_u32_default(dev, "mask", 0);
57 static const struct udevice_id syscon_reboot_ids[] = {
58 { .compatible = "syscon-reboot", .data = SYSRESET_COLD },
59 { .compatible = "syscon-poweroff", .data = SYSRESET_POWER_OFF },
63 U_BOOT_DRIVER(syscon_reboot) = {
64 .name = "syscon_reboot",
65 .id = UCLASS_SYSRESET,
66 .of_match = syscon_reboot_ids,
67 .probe = syscon_reboot_probe,
68 .priv_auto_alloc_size = sizeof(struct syscon_reboot_priv),
69 .ops = &syscon_reboot_ops,