[RFC 3/5] powerpc/mpic: Add support for non-contiguous irq ranges

[Scott Wood]

On Tue, 2018-08-07 at 12:09 -0600, Rob Herring wrote:
> On Fri, Jul 27, 2018 at 03:17:59PM +0530, Bharat Bhushan wrote:
> > Freescale MPIC h/w may not support all interrupt sources reported
> > by hardware, "last-interrupt-source" or platform. On these platforms
> > a misconfigured device tree that assigns one of the reserved
> > interrupts leaves a non-functioning system without warning.
> 
> There are lots of ways to misconfigure DTs. I don't think this is 
> special and needs a property.

Yeah, the system will be just as non-functioning if you specify a valid-but-
wrong-for-the-device interrupt number.

>  We've had some interrupt mask or valid 
> properties in the past, but generally don't accept those.

FWIW, some of them like protected-sources and mpic-msgr-receive-mask aren't
for detecting errors, but are for partitioning (though the former is obsolete
with pic-no-reset).

-Scott