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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /Documentation/watchdog
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'Documentation/watchdog')
-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt7
-rw-r--r--Documentation/watchdog/watchdog-parameters.txt3
2 files changed, 10 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:
diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
index 692791cc6..9f9ec9f76 100644
--- a/Documentation/watchdog/watchdog-parameters.txt
+++ b/Documentation/watchdog/watchdog-parameters.txt
@@ -208,6 +208,9 @@ nowayout: Watchdog cannot be stopped once started
-------------------------------------------------
omap_wdt:
timer_margin: initial watchdog timeout (in seconds)
+early_enable: Watchdog is started on module insertion (default=0
+nowayout: Watchdog cannot be stopped once started
+ (default=kernel config parameter)
-------------------------------------------------
orion_wdt:
heartbeat: Initial watchdog heartbeat in seconds