Hi Krzysztof,

quoted

+Optional properties:
+- touch-key-connected	: specifies whether the touchkey feature is connected

You are making it a generic property but it is specific to this device,
so:
	st,touch-key-connected
?

quoted

+- ledvdd-supply		: power supply to the touch key leds

Is this really optional? If yes... how it gets the power when not
provided?

yes, it is. This is required only if (st,)touch-key-connected is
added, it's not required in any other case. Anyway, even if not
present, the device works, just without leds, which is fine for
me.

Thanks,
Andi