On 11/7/21 4:24 PM, Ansuel Smith wrote:
diff --git a/Documentation/leds/leds-class.rst b/Documentation/leds/leds-class.rst
index 5bf6e5d471ce..0a3bbe71dac7 100644
--- a/Documentation/leds/leds-class.rst
+++ b/Documentation/leds/leds-class.rst
@@ -190,6 +190,30 @@ If the second argument (enable) to the trigger_offload() method is false, any
active HW offloading must be deactivated. In this case errors are not permitted
in the trigger_offload() method and the driver will be set to the new trigger.
+The offload trigger will use the function configure_offload() provided by the driver
+that will configure the offloaded mode for the LED.
+This function passes as the first argument (offload_flags) a u32 flag.
+The second argument (cmd) of the configure_offload() method can be used to do various
+operations for the specific trigger. We currently support ENABLE, DISABLE, READ and
+SUPPORTED to enable, disable, read the state of the offload trigger and ask the LED
+driver supports the specific offload trigger.
+
+In ENABLE/DISABLE configure_offload() should configure the LED to enable/disable the
+requested trigger (flags).
+In READ configure_offload() should return 0 or 1 based on the status of the requested
+trigger (flags).
+In SUPPORTED configure_offload() should return 0 or 1 if the LED driver supports the
+requested trigger (flags) or not.
+
+The u32 flag is specific to the trigger and change across them. It's in the LED
changes
+driver interest know how to elaborate this flag and to declare support for a
driver's
+particular offload trigger. For this exact reason explicit support for the specific
+trigger is mandatory or the driver returns -EOPNOTSUPP if asked to enter offload mode
+with a not supported trigger.
+If the driver returns -EOPNOTSUPP on configure_offload(), the trigger activation will
+fail as the driver doesn't support that specific offload trigger or doesn't know
+how to handle the provided flags.
--
~Randy
