On ETRAX FS, all pins on the first port (and only the first port) have
interrupt support.
On ARTPEC-3, all pins on all ports have interrupt support. However,
there are only eight interrupts. Each of the interrupts is associated
with a group of pins and for each interrupt the one pin from the group
which will trigger it can be selected.
Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>