tree a6876c5ac0d44025789af6f4a0fada56af823fe8
parent 4250785723d92b6578176a2d961d47ab66e08124
author Naveen Moses <naveen.mosess@hcl.com> 1658255506 +0530
committer Naveen Moses <naveen.mosess@hcl.com> 1666098770 +0000

Add serial uart mux interface class

1. This change adds the multi-host serial uart mux interface class.

In a multi-host system when the host position is changed,
then the serial uart mux is configured to enable  the
respective host's serial console which is accessed via
OCP debug card.

2. Introduced two new methods in gpio.cpp
   setGpioState - set state for gpio fd based on polarity
   getGpiostate - get state for gpio fd based on polarity

3. Updated the readme file about details on the new gpio
configs

design : https://github.com/openbmc/docs/blob/master/designs/multihost-phosphor-buttons.md

Testing : This change is verified in yosemiteV2 platform.

Signed-off-by: Naveen Moses <naveen.mosess@hcl.com>
Change-Id: I861d70570650d7dfcab842a35bdcf63a9fdd3bd0