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Diffstat (limited to 'Documentation/watchdog/watchdog-kernel-api.rst')
| -rw-r--r-- | Documentation/watchdog/watchdog-kernel-api.rst | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.rst b/Documentation/watchdog/watchdog-kernel-api.rst index 068a55ee0d4a..243231fe4c0a 100644 --- a/Documentation/watchdog/watchdog-kernel-api.rst +++ b/Documentation/watchdog/watchdog-kernel-api.rst @@ -77,7 +77,7 @@ It contains following fields: * groups: List of sysfs attribute groups to create when creating the watchdog device. * info: a pointer to a watchdog_info structure. This structure gives some - additional information about the watchdog timer itself. (Like it's unique name) + additional information about the watchdog timer itself. (Like its unique name) * ops: a pointer to the list of watchdog operations that the watchdog supports. * gov: a pointer to the assigned watchdog device pretimeout governor or NULL. * timeout: the watchdog timer's timeout value (in seconds). @@ -336,3 +336,15 @@ an action is taken by a preconfigured pretimeout governor preassigned to the watchdog device. If watchdog pretimeout governor framework is not enabled, watchdog_notify_pretimeout() prints a notification message to the kernel log buffer. + +To set the last known HW keepalive time for a watchdog, the following function +should be used:: + + int watchdog_set_last_hw_keepalive(struct watchdog_device *wdd, + unsigned int last_ping_ms) + +This function must be called immediately after watchdog registration. It +sets the last known hardware heartbeat to have happened last_ping_ms before +current time. Calling this is only needed if the watchdog is already running +when probe is called, and the watchdog can only be pinged after the +min_hw_heartbeat_ms time has passed from the last ping. |