drivers/ipmi: implement "POST complete" notification functionality

Some server boards like OCP Tiogapass and X11-LGA1151 boards use a gpio
for signalling "POST complete" to BMC/IPMI. Add a new driver devicetree
option to set the gpio and configure a callback that pulls the gpio low
right before jumping to the payload.

Test: Check that sensor readings appear in BMC web interface when the
payload gets executed.

Successfully tested on Supermicro X11SSM-F with CB:48097, X11SSH-TF with
CB:48711 and OCP DeltaLake with CB:48672.

Change-Id: I34764858be9c7f7f1110ce885fa056591164f148
Tested-by: Johnny Lin <Johnny_Lin@wiwynn.com>
Tested-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: Patrick Rudolph <siro@das-labor.org>
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48096
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

0 files changed, 0 insertions, 0 deletions