serial: sh-sci: Handle GPIO function requests.
This adds initial support for requesting the various GPIO functions
necessary for certain ports. This just plugs in dumb request/free logic,
but serves as a building block for migrating off of the ->init_pins mess
to a wholly gpiolib backed solution (primarily parts with external
RTS/CTS pins, but will also allow us to clean up RXD pin testing).
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
(cherry picked from commit 50f0959ad4f9ac1c5ee208bb820de299a1b3730b)
Signed-off-by: Simon Horman <horms@verge.net.au>
2 files changed
