[RFC PATCH 1/5] watchdog: Add API to trigger reboots

Some hardware implements reboot through its watchdog hardware,
for example by triggering a watchdog timeout. Platform specific
code starts to spread into watchdog drivers, typically by setting
pointers to a callback functions which is then called from the
platform reset handler.

To simplify code and provide a unified API to trigger reboots by
watchdog drivers, provide a single API to trigger such reboots
through the watchdog subsystem.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/watchdog/watchdog_core.c |   17 +++++++++++++++++
 include/linux/watchdog.h         |   11 +++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index cec9b55..4ec6e2f 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c

@@ -43,6 +43,17 @@
 static DEFINE_IDA(watchdog_ida);
 static struct class *watchdog_class;
 
+static struct watchdog_device *wdd_reboot_dev;
+
+void watchdog_do_reboot(enum reboot_mode mode, const char *cmd)
+{
+	if (wdd_reboot_dev) {
+		if (wdd_reboot_dev->ops->reboot)
+			wdd_reboot_dev->ops->reboot(wdd_reboot_dev, mode, cmd);
+	}
+}