dm: sysreset: add watchdog-reboot driver
Add a new sysreset driver that uses the recently added watchdog support.
It performs a full SoC reset by calling wdt_expire_now op.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/sysreset/sysreset_watchdog.c b/drivers/sysreset/sysreset_watchdog.c
new file mode 100644
index 0000000..304ed05
--- /dev/null
+++ b/drivers/sysreset/sysreset_watchdog.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <wdt.h>
+
+struct wdt_reboot_priv {
+ struct udevice *wdt;
+};
+
+static int wdt_reboot_request(struct udevice *dev, enum sysreset_t type)
+{
+ struct wdt_reboot_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = wdt_expire_now(priv->wdt, 0);
+ if (ret)
+ return ret;
+
+ return -EINPROGRESS;
+}
+
+static struct sysreset_ops wdt_reboot_ops = {
+ .request = wdt_reboot_request,
+};
+
+int wdt_reboot_probe(struct udevice *dev)
+{
+ struct wdt_reboot_priv *priv = dev_get_priv(dev);
+ int err;
+
+ err = uclass_get_device_by_phandle(UCLASS_WDT, dev,
+ "wdt", &priv->wdt);
+ if (err) {
+ error("unable to find wdt device\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static const struct udevice_id wdt_reboot_ids[] = {
+ { .compatible = "wdt-reboot" },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(wdt_reboot) = {
+ .name = "wdt_reboot",
+ .id = UCLASS_SYSRESET,
+ .of_match = wdt_reboot_ids,
+ .ops = &wdt_reboot_ops,
+ .priv_auto_alloc_size = sizeof(struct wdt_reboot_priv),
+ .probe = wdt_reboot_probe,
+};