mkbp_event: Add CONFIG_MKBP_USE_GPIO_AND_HOST_EVENT.

MKBP was recently refactored to offer choice in the MKBP notification
method.  However, if a board is using a GPIO to notify the AP of a MKBP
event, and the AP cannot wake from the GPIO, the MKBP event cannot wake
the system up from suspend as is.  This commit simply adds a new config
option, CONFIG_MKBP_USE_GPIO_AND_HOST_EVENT such that MKBP events can
wake the system from suspend.  Note that the board will have to add MKBP
events to the host event sleep mask in coreboot.  Typically on ARM
devices, EC_INT_L is already a wake pin, but on Intel devices it is not;
there's actually a different pin, PCH_WAKE_L which is set via sending a
host event and wakes the system.

BUG=b:136272898,chromium:786721
BRANCH=None
TEST=Enable config option on nocturne, flash nocturne, suspend DUT,
verify that MKBP events can wake the AP.

Change-Id: If5026bfe3efacbc051f99a180e061c6fd679ce5a
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1685786
Reviewed-by: Jett Rink <jettrink@chromium.org>
Tested-by: Aseda Aboagye <aaboagye@chromium.org>
Commit-Queue: Aseda Aboagye <aaboagye@chromium.org>

0 files changed, 0 insertions, 0 deletions