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-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt9
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index abbcf2ce8f62..429f81bf0cf7 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -56,8 +56,9 @@ It contains following fields:
This data should only be accessed via the watchdog_set_drvadata and
watchdog_get_drvdata routines.
* status: this field contains a number of status bits that give extra
- information about the status of the device (Like: is the device opened via
- the /dev/watchdog interface or not, ...).
+ information about the status of the device (Like: is the watchdog timer
+ running/active, is the device opened via the /dev/watchdog interface or not,
+ ...).
The list of watchdog operations is defined as:
@@ -109,6 +110,10 @@ they are supported. These optional routines/operations are:
The status bits should (preferably) be set with the set_bit and clear_bit alike
bit-operations. The status bits that are defined are:
+* WDOG_ACTIVE: this status bit indicates whether or not a watchdog timer device
+ is active or not. When the watchdog is active after booting, then you should
+ set this status bit (Note: when you register the watchdog timer device with
+ this bit set, then opening /dev/watchdog will skip the start operation)
* WDOG_DEV_OPEN: this status bit shows whether or not the watchdog device
was opened via /dev/watchdog.
(This bit should only be used by the WatchDog Timer Driver Core).