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-rw-r--r--Documentation/watchdog/convert_drivers_to_kernel_api.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/watchdog/convert_drivers_to_kernel_api.txt b/Documentation/watchdog/convert_drivers_to_kernel_api.txt
index be8119bb15d2..271b8850dde7 100644
--- a/Documentation/watchdog/convert_drivers_to_kernel_api.txt
+++ b/Documentation/watchdog/convert_drivers_to_kernel_api.txt
@@ -59,6 +59,10 @@ Here is a overview of the functions and probably needed actions:
WDIOC_GETTIMEOUT:
No preparations needed
+ WDIOC_GETTIMELEFT:
+ It needs get_timeleft() callback to be defined. Otherwise it
+ will return EOPNOTSUPP
+
Other IOCTLs can be served using the ioctl-callback. Note that this is mainly
intended for porting old drivers; new drivers should not invent private IOCTLs.
Private IOCTLs are processed first. When the callback returns with