mirror of
https://github.com/AsahiLinux/u-boot
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a8f63d18bb
Add an option to automatically register watchdog devices with the wdt_reboot driver for use with sysreset. This allows sysreset to be a drop-in replacement for platform-specific watchdog reset code, without needing any device tree changes. Signed-off-by: Samuel Holland <samuel@sholland.org> Reviewed-by: Stefan Roese <sr@denx.de>
83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/device-internal.h>
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#include <errno.h>
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#include <malloc.h>
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#include <sysreset.h>
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#include <wdt.h>
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struct wdt_reboot_plat {
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struct udevice *wdt;
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};
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static int wdt_reboot_request(struct udevice *dev, enum sysreset_t type)
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{
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struct wdt_reboot_plat *plat = dev_get_plat(dev);
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int ret;
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ret = wdt_expire_now(plat->wdt, 0);
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if (ret)
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return ret;
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return -EINPROGRESS;
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}
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static struct sysreset_ops wdt_reboot_ops = {
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.request = wdt_reboot_request,
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};
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static int wdt_reboot_of_to_plat(struct udevice *dev)
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{
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struct wdt_reboot_plat *plat = dev_get_plat(dev);
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int err;
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err = uclass_get_device_by_phandle(UCLASS_WDT, dev,
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"wdt", &plat->wdt);
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if (err) {
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pr_err("unable to find wdt device\n");
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return err;
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}
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return 0;
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}
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static const struct udevice_id wdt_reboot_ids[] = {
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{ .compatible = "wdt-reboot" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(wdt_reboot) = {
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.name = "wdt_reboot",
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.id = UCLASS_SYSRESET,
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.of_match = wdt_reboot_ids,
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.of_to_plat = wdt_reboot_of_to_plat,
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.plat_auto = sizeof(struct wdt_reboot_plat),
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.ops = &wdt_reboot_ops,
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};
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#if IS_ENABLED(CONFIG_SYSRESET_WATCHDOG_AUTO)
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int sysreset_register_wdt(struct udevice *dev)
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{
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struct wdt_reboot_plat *plat = malloc(sizeof(*plat));
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int ret;
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if (!plat)
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return -ENOMEM;
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plat->wdt = dev;
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ret = device_bind(dev, DM_DRIVER_GET(wdt_reboot),
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dev->name, plat, ofnode_null(), NULL);
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if (ret) {
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free(plat);
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return ret;
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}
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return 0;
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}
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#endif
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