Most likely Snooze is turning off the enables for the watchdog clock. Watchdog is not something I took into account when writing the T4 sleep code. I'm sure there are other things that are getting in the way with these...
If anyone wants to see the incredibly difficult bring-up of the linux kernel on a new architecture have a look at this current bring-up: https://twitter.com/AsahiLinux and https://asahilinux.org and...