tree 3da15c980ac5e48f2b741922c470b823aaf935ea
parent 70e7f939fd06a873ca1e93258cb1fe99c7417d21
author B. J. Wyman <bjwyman@gmail.com> 1618957882 +0000
committer Shawn McCarney <shawnmm@us.ibm.com> 1625180518 +0000

psu-ng: Add in ability to get presence via GPIO

The device tree and entity-manager (D-Bus) properties have the power
supply GPIO presence lines named, so we can use those GPIO line names to
find the GPIO device to read for determining power supply presence.

Some systems have the power supply presence lines in a gpio-keys section
(notably IBM Rainier). To facilitate continued function while running
with a device tree that has not removed those device tree entries, allow
for a fallback to the old inventory D-Bus propertiesChanged or
interfaceAdded matches for presence.

Change-Id: I5002aa62e5b460463cc26328c889a3786b467a3c
Signed-off-by: B. J. Wyman <bjwyman@gmail.com>