Re: [PATCH RFC v3 03/11] leds: trigger: Add offloaded() callback and provide trigger_may_offload attribute

> There are multiple triggers implementing hardware control. However, the
> LED trigger core doesn't really know the hardware control (offloaded)
> state since the coordination is done directly between the trigger and
> the LED driver. It can only assume private triggers as offloaded and
> generic ones as not offloaded.
> 
> Add an offloaded() callback so that triggers can report their offloaded
> states to the LED trigger core. When unimplemented, it defaults to true
> for private triggers and false for generic ones to keep the current
> behavior unchanged.
> 
> With that, provide a new attribute "trigger_may_offload", so that
> userspace can determine:
> 
> - if the LED device supports hardware control (supported => visible)
> - which trigger is the hardware control trigger selected by the LED
>   device
> - if the trigger is selected ("<foo_trigger>")
> - if the trigger is offloaded ("[foo_trigger]")
> 
> Note: the documentation describes the attribute as "returning a list"
> despite the LED core currently only supports one hardware control
> trigger per LED device. This is intentional to make the attribute
> extensible in the future without breaking userspace.
> 
> Signed-off-by: Rong Zhang <[email protected]>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/[email protected]?part=3