[PATCH 3/3] First cut at PReP support for arch/powerpc

[Yoder Stuart-B08248]

> > > > +		MPIC: interrupt-controller at d {
> > > > +			device_type = "open-pic";
> > > > 
> > > > device_type = "interrupt-controller".
> > 
> > Not according to the binding in booting-without-of.txt
> 
> My understanding here, though possibly flawed, is that the current
> implementation has "open-pic" but _should_ have "interrupt-controller"
> as that is the officially correct name.
> 
> I _think_ this means we need a transitional period where we update
> the code to look for "interrupt-controller", and obsoletedly, looks
> for the "open-pic", while we transition to the new, correct name.

"open-pic" is the correct value for the device_type property.
See the binding at:
http://playground.sun.com/1275/bindings/chrp/chrp1_8a.ps
That is the definition for open pic interrupt controllers (AFAIK).

I am not aware of any official binding with "interrupt-controller" 
as the device_type.

However, the interrupt mapping spec says that all interrupt
controller (regardless of device_type) must have a 
property named "interrupt-controller" to identify
the device node as an interrupt controller and root of
a interrupt tree.
See: http://playground.sun.com/1275/practice/imap/imap0_9d.html

Stuart