The press events are detected in the gateware and latched
and the firmware can just read them as "events". They also
trigger sys clock domain wake up if it was sleeping.
This is better since the 'sys' clock domain can be shutdown for
some non-negligible amount of time and it could lead to missed
presses or latency.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Sylvain Munaut