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

[Sebastian Andrzej Siewior <bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>]

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