But how often are developers going to have to tweak these things?  SoC 
interrupts tend to be fixed so its just a question of external 
interrupts (and controllers) that a customer has to describe in their 
dts.

Yes.  So if we want to add some new representation for
interrupt mapping, it would be good if those users
could benefit.  Then again, I don't see any evidence
that "external users" ever need to do any (complicated)
interrupt mapping stuff.


Segher