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-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index a0438f395..d8b0d3367 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -36,6 +36,10 @@ The watchdog_unregister_device routine deregisters a registered watchdog timer
device. The parameter of this routine is the pointer to the registered
watchdog_device structure.
+The watchdog subsystem includes an registration deferral mechanism,
+which allows you to register an watchdog as early as you wish during
+the boot process.
+
The watchdog device structure looks like this:
struct watchdog_device {
@@ -52,6 +56,7 @@ struct watchdog_device {
void *driver_data;
struct mutex lock;
unsigned long status;
+ struct list_head deferred;
};
It contains following fields:
@@ -80,6 +85,8 @@ It contains following fields:
information about the status of the device (Like: is the watchdog timer
running/active, is the nowayout bit set, is the device opened via
the /dev/watchdog interface or not, ...).
+* deferred: entry in wtd_deferred_reg_list which is used to
+ register early initialized watchdogs.
The list of watchdog operations is defined as: