watchdog: WatchDog Timer Driver Core - Add minimum and max timeout

Add min_timeout (minimum timeout) and max_timeout
values so that the framework can check if the new
timeout value is between the minimum and maximum
timeout values. If both values are 0, then the
framework will leave the check for the watchdog
device driver itself.

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 325d90b6641b..111843f88b2a 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -95,6 +95,8 @@ struct watchdog_ops {
  * @ops:        Pointer to the list of watchdog operations.
  * @bootstatus: Status of the watchdog device at boot.
  * @timeout:    The watchdog devices timeout value.
+ * @min_timeout:The watchdog devices minimum timeout value.
+ * @max_timeout:The watchdog devices maximum timeout value.
  * @driver-data:Pointer to the drivers private data.
  * @status:     Field that contains the devices internal status bits.
  *
@@ -109,6 +111,8 @@ struct watchdog_device {
         const struct watchdog_ops *ops;
         unsigned int bootstatus;
         unsigned int timeout;
+        unsigned int min_timeout;
+        unsigned int max_timeout;
         void *driver_data;
         unsigned long status;
 /* Bit numbers for status flags */