path: root/Documentation/watchdog
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authorWim Van Sebroeck <wim@iguana.be>2011-11-29 16:24:16 +0100
committerWim Van Sebroeck <wim@iguana.be>2012-01-06 15:22:04 +0100
commitff0b3cd4a416bc727b0797b95b229b278d2a28f2 (patch)
treecd6bdc2304ee8fd751f3bd79607c7bcaf337e198 /Documentation/watchdog
parentb8ec61189f3b4cd9d1b2856342f5d7676151d01c (diff)
watchdog: add nowayout helpers to Watchdog Timer Driver Kernel API
Add two nowayout helpers for the Watchdog Timer Driver Kernel API. And apply this to the already converted drivers. Note: s3c2410_wdt lost the nowayout feature during the conversion. Reviewed-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'Documentation/watchdog')
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index 4f7c894244d..4b93c28e35c 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -1,6 +1,6 @@
The Linux WatchDog Timer Driver Core kernel API.
-Last reviewed: 22-Jul-2011
+Last reviewed: 29-Nov-2011
Wim Van Sebroeck <wim@iguana.be>
@@ -142,6 +142,14 @@ bit-operations. The status bits that are defined are:
* WDOG_NO_WAY_OUT: this bit stores the nowayout setting for the watchdog.
If this bit is set then the watchdog timer will not be able to stop.
+ To set the WDOG_NO_WAY_OUT status bit (before registering your watchdog
+ timer device) you can either:
+ * set it statically in your watchdog_device struct with
+ (this will set the value the same as CONFIG_WATCHDOG_NOWAYOUT) or
+ * use the following helper function:
+ static inline void watchdog_set_nowayout(struct watchdog_device *wdd, int nowayout)
Note: The WatchDog Timer Driver Core supports the magic close feature and
the nowayout feature. To use the magic close feature you must set the
WDIOF_MAGICCLOSE bit in the options field of the watchdog's info structure.