Add the required infrastructure to enable and report edge events
of the pins to the GPIO core. The actual hook-up of the event interrupt
will happen separately.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Co-developed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>