linux-kernel - Re: [PATCH 03/11] x86/dtb: Add a device tree for CE4100

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Message-ID: <4CF4DE00.4030105@linutronix.de>
Date:	Tue, 30 Nov 2010 12:20:32 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mitch Bradley <wmb@...mworks.com>,
	Scott Wood <scottwood@...escale.com>, sodaville@...utronix.de,
	x86@...nel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/11] x86/dtb: Add a device tree for CE4100

Benjamin Herrenschmidt wrote:
> On Mon, 2010-11-29 at 23:47 +0000, Alan Cox wrote:
>> That may not be wise. Your real bus heirarchy may not be architecturally
>> defined on some systems so you can't incorporate it into code, nor is it
>> necessarily a heirarchy - eg some of the Geodes. 
> 
> Ok, so I'd suggest doing something like:
> 
>  - pci is below the corresponding atom node
>  - isa is a child of pci
> 
> The later is a useful representation even if it doesn't correspond to
> reality. From an address representation perspective, ISA can be
> considered somewhat as a substractive decoding child of PCI (again even
> if that's not 100% true), which simplifies the representation in the
> device-tree a bit, and allows to still have things like VGA devices on
> the PCI segment that decode IO ports in the ISA range.

okay.

> Cheers,
> Ben.


Sebastian
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