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authorWolfram Sang <w.sang@pengutronix.de>2011-12-02 00:43:11 +0100
committerWim Van Sebroeck <wim@iguana.be>2012-01-06 15:26:14 +0100
commit02861cca4b4f1ceaa7dc805041d84caee580670b (patch)
tree497521e74d64c1eddd7ab1e141bea9bfd045e0d2 /Documentation/watchdog
parent9d36bc8cd8d607ec5db98bcc85b27cff9e1b6dfd (diff)
downloadlinux-02861cca4b4f1ceaa7dc805041d84caee580670b.tar.gz
watchdog: documentation: describe nowayout in coversion-guide
nowayout is also handled by the watchdog core. Describe how this needs to be addressed in the conversion guide. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'Documentation/watchdog')
-rw-r--r--Documentation/watchdog/convert_drivers_to_kernel_api.txt19
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/watchdog/convert_drivers_to_kernel_api.txt b/Documentation/watchdog/convert_drivers_to_kernel_api.txt
index ae1e90036d0..be8119bb15d 100644
--- a/Documentation/watchdog/convert_drivers_to_kernel_api.txt
+++ b/Documentation/watchdog/convert_drivers_to_kernel_api.txt
@@ -163,6 +163,25 @@ Here is a simple example for a watchdog device:
+};
+Handle the 'nowayout' feature
+-----------------------------
+
+A few drivers use nowayout statically, i.e. there is no module parameter for it
+and only CONFIG_WATCHDOG_NOWAYOUT determines if the feature is going to be
+used. This needs to be converted by initializing the status variable of the
+watchdog_device like this:
+
+ .status = WATCHDOG_NOWAYOUT_INIT_STATUS,
+
+Most drivers, however, also allow runtime configuration of nowayout, usually
+by adding a module parameter. The conversion for this would be something like:
+
+ watchdog_set_nowayout(&s3c2410_wdd, nowayout);
+
+The module parameter itself needs to stay, everything else related to nowayout
+can go, though. This will likely be some code in open(), close() or write().
+
+
Register the watchdog device
----------------------------