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

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Date:	Tue, 30 Nov 2010 07:05:28 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	sodaville@...utronix.de, devicetree-discuss@...ts.ozlabs.org,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/11] x86/dtb: Add a device tree for CE4100

On Mon, 2010-11-29 at 13:07 -0600, Scott Wood wrote:
> 
> The motivation for simple-bus comes from Linux, but its definition is
> OS-neutral.  It indicates that no special bus knowledge is required to
> access the devices under it.

That's never 100% true. In the case of ISA it's even less true due to
the difference between IO and Memory space.

> I don't think it applies to ISA, though -- I/O space is special bus
> knowledge, and the "ranges" looks weird for memory-space as well.

Right.

> If we're going to get rid of device_type here, it would be nice to
> have some other way to indicate that this node follows the ISA
> binding, without having to recognize an implementation-specific
> compatible. 

The code in drivers/of/address.c uses the name property to match isa
busses.

Cheers,
Ben.


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