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watchdog: core: dt: add support for the timeout-sec dt property

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Add support for watchdog drivers to initialize/set the timeout field
of the watchdog_device structure. The timeout field is initialised
either with the module timeout parameter value (if valid) or with the
timeout-sec dt property (if valid). If both are invalid the initial
value is unchanged.

Signed-off-by: Fabio Porcedda <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
This commit is contained in:
Fabio Porcedda 2013-01-08 11:04:10 +01:00 • committed by Wim Van Sebroeck
commit 3048253ed9
4 changed files with 80 additions and 12 deletions
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14
Documentation/watchdog/watchdog-kernel-api.txt
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@ -1,6 +1,6 @@
The Linux WatchDog Timer Driver Core kernel API.
===============================================
Last reviewed: 22-May-2012
Last reviewed: 12-Feb-2013
Wim Van Sebroeck <[email protected]>
@ -212,3 +212,15 @@ driver specific data to and a pointer to the data itself.
The watchdog_get_drvdata function allows you to retrieve driver specific data.
The argument of this function is the watchdog device where you want to retrieve
data from. The function returns the pointer to the driver specific data.
To initialize the timeout field, the following function can be used:
extern int watchdog_init_timeout(struct watchdog_device *wdd,
unsigned int timeout_parm, struct device *dev);
The watchdog_init_timeout function allows you to initialize the timeout field
using the module timeout parameter or by retrieving the timeout-sec property from
the device tree (if the module timeout parameter is invalid). Best practice is
to set the default timeout value as timeout value in the watchdog_device and
then use this function to set the user "preferred" timeout value.
This routine returns zero on success and a negative errno code for failure.