Re: [RFC] powerpc: Document new property called interrupt-parents

On Wed, Feb 28, 2007 at 08:56:55AM -0700, Yoder Stuart-B08248 wrote:

quoted

-----Original Message-----
From: David Gibson [mailto:david@gibson.dropbear.id.au] 
Sent: Tuesday, February 27, 2007 6:56 PM
To: Yoder Stuart-B08248
Cc: paulus@samba.org; linuxppc-dev@ozlabs.org
Subject: Re: [RFC] powerpc: Document new property called 
interrupt-parents

On Tue, Feb 27, 2007 at 04:54:45PM -0600, Stuart Yoder wrote:

quoted

Document new property called interrupt-parents which can
be used to represent interrupts for devices that route
interrupts to more than one interrupt controller.

Well, whatever Segher says, I'm still very concerned about the
potential for extra difficulty in debugging with this approach.

The issue, as I understand it, is the potential for an old
kernel parser to silently misparse a new dev tree with this
new property.

Do the version and last_comp_version in the blob header
help here?

Unfortunately not.  Those fields version the the serialization format
of the device tree, not the content of the device tree.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson