From: pbrobinson on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/777#note_52471...
So s390/powerpc are not using PS2 anywhere. Some *old* PowerPC platforms
had `PC_SERIO` in the POWER4 sort of age, but in Fedora/RHEL we only
support POWER8 or later.
So *old* PowerPC did use PS/2 but none of the modern POWER8/POWER0
little endian platforms that we actually support do.