GPIO sysfs : set a wake source

Stephen Warren [off-list ref] writes:

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Instead figure out how to make the subsystems we have and the
device trees express what you want to do.

As I said above, I don't think it's the way to go. I have *no* subsystem to
address.
Devicetree can't help in the toggle to "activate" or "deactivate" the wakeup
upon this GPIO, can it ?

This sounds very similar to WiFi rfkill, although it's a MODEM not WiFi.

Mmmm yes, similar. But with one big difference : RFKill is control of wireless
chip "up state", while the toggle I'm speaking of will purely say if the "input
GPIO" will trigger a wake-up from S3 or not.

If RFKill interface had a toggle to say "hardware rfkill button toggle can
wake-up the kernel out of S3" then it would be very similar.

Cheers.

-- 
Robert