tree df8759e59e199f767d712931d493189183ad6810
parent 886574cd772be492212cd5a1fde8bc2de8dabf9b
author Adriana Kobylak <anoo@us.ibm.com> 1634140345 +0000
committer Shawn McCarney <shawnmm@us.ibm.com> 1636410016 +0000

psu-ng: Set the power-config-full-load GPIO

The power-config-full-load GPIO is an optional GPIO that communicates to
the HW the number of expected number of working PSUs. Reference:
https://github.com/openbmc/docs/commit/2cbf57a8a0bb8d95b0e19b7fc27c4f95cbd8609a

If the system implements this GPIO, set it to the appropriate value when
the psu monitor app starts, and every time the system powers on in case
the number of PSUs was changed when the system was powered off.

In the GPIOReader constructor, move the error message from a journal log
to the exception, otherwise this journal log will show up on all systems
that do not implement this GPIO.

Tested:

Verified the correct value was set by reading the GPIO after
writing by calling line.get_value() during testing.

Verified the GPIOReader only displays the error message when a
GPIO does not exist and the exception is not caught, no error messages
are displayed for a missing power-config-full-load GPIO:
Oct 14 20:54:27 p10bmc phosphor-psu-monitor[1152]: Failed to find
line: Line does not exist: test-gpio
Oct 14 20:54:27 p10bmc systemd[1]: phosphor-psu-monitor.service: Main
process exited, code=exited, status=254/n/a

Change-Id: Ifdcd9f552c28cec860b9b65a1133e179683fb0db
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>