[RFC] Interrupt mapping documentation

[Jon Loeliger]

So, like, the other day Segher Boessenkool mumbled:
> >> Just *require* #address-cells for everything with addressable sub- 
> >> nodes,
> >> at least in DTC.  Doesn't cost much, and no confusion anymore.
> >
> > Woot!  Send me a patch! :-)
> 
> Noooo...  tiiiime...  And way too lazy.

Jinx.

> Could you pick this up, please?

I would not be able to get anywhere near it until
significantly into August at the very earliest.

Really.

jdl