There's a custom board type containing the AR9485 which requires some slightly different config handling.
I don't know if the qca_main based HAL has this code or not.
So - evaluate what's going on, and if not, port it over.
The Linux bug and patch:
Over to maintainer(s).
For bugs that match the following
- Status Is In progress
- Untouched since 2018-01-01.
- Affects Base System OR Documentation
Reset to open status.
I did a quick pass but if you are getting this email it might be worthwhile to double check to see if this bug ought to be closed.