tree f7720bd43139f88751f780ddc27005bc058aa9c1
parent 9b556add1bf58d00703049a9d10372b40ec73456
author Manojkiran Eda <manojkiran.eda@gmail.com> 1613713833 +0530
committer ManojKiran Eda <manojkiran.eda@gmail.com> 1614932999 +0000

Make snoop port optional for the daemon

- In the current state, the daemon only works on the bmc
  systems that has the snooping port enabled, but for IBM
  systems, we communicate the progress codes aka post codes
  via pldm.

- In addition to the host, we also have couple of bmc
  applications that can post these codes during the early
  boot sequence.

- The intent behind this commit is to make the snooping port
  argument optional for the snooping service, so that the
  daemon can still host the raw interface & the Raw value
  property for pldm to write into, even when the snooping
  device is not present.

- This commit would try to address the following mailing list
  proposal.
  https://lore.kernel.org/openbmc/4795347F-477D-45EF-A145-0C7B163FE01B@getmailspring.com/

TestedBy:
- meson builddir
- ninja -C builddir
- copy the snoopd daemon into a witherspoon system and make sure
  it hosts the dbus interface.

- meson builddir
- ninja -C builddir -Dsnoop-device=/dev/aspeed-lpc-snoop0
- copy the snoopd daemon into witherspoon and it fails to start
  beacause it could not find the snoop port.
root@witherspoon:/tmp# Unable to open: /dev/aspeed-lpc-snoop0
[1]+  Done(255)               ./snoopd

Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
Change-Id: I941897a7aea795f418494087ac8aa1fbc6ecf633