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-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index 55120a055a14..dd8f912c0576 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -156,6 +156,11 @@ they are supported. These optional routines/operations are:
because the watchdog does not necessarily has a 1 second resolution).
(Note: the WDIOF_SETTIMEOUT needs to be set in the options field of the
watchdog's info structure).
+ If the watchdog driver does not have to perform any action but setting the
+ watchdog_device.timeout, this callback can be omitted.
+ If set_timeout is not provided but, WDIOF_SETTIMEOUT is set, the watchdog
+ infrastructure updates the timeout value of the watchdog_device internally
+ to the requested value.
* get_timeleft: this routines returns the time that's left before a reset.
* restart: this routine restarts the machine. It returns 0 on success or a
negative errno code for failure.