linux-kernel - Re: [PATCH 2/4] sparc: break out some prom device-tree building code out into drivers/of

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Date:	Tue, 29 Jun 2010 11:03:24 -0400
From:	Andres Salomon <dilinger@...ued.net>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	devicetree-discuss@...ts.ozlabs.org, sparclinux@...r.kernel.org,
	x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, cjb@...top.org, Mitch Bradley <wmb@...top.org>,
	pgf@...top.org, linux-kernel@...r.kernel.org, davem@...emloft.net,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 2/4] sparc: break out some prom device-tree building
 code  out into drivers/of

On Tue, 29 Jun 2010 00:50:08 -0700
Grant Likely <grant.likely@...retlab.ca> wrote:

> On Mon, Jun 28, 2010 at 7:00 PM, Andres Salomon <dilinger@...ued.net> wrote:
> >
> > Stick code into drivers/of/pdt.c (Prom Device Tree) that other
> > architectures with OpenFirmware resident in memory can make use of.
> >
> > Signed-off-by: Andres Salomon <dilinger@...ued.net>
> 
> Hi Andres,
> 
> The patch itself looks fine, but there are currently two methods for
> extracting the device tree from open firmware; one in arch/powerpc
> using the flattened format, and one in arch/sparc.  I don't want to
> end up maintaining both methods in drivers/of, and there has also some
> discussions on moving the powerpc version into common code.  I've been
> thinking about using the powerpc approach to support ARM platforms
> using both the flat tree and real OFW.
> 
> Ben, what say you?  Before I do anything I'd like to have your opinion.
> 

So you're saying that you want ARM (and sparc, and OLPC) to generate a
flat tree by calling into OFW?  Sparc and OLPC have very similar
mechanisms for getting device tree info from OFW, so it makes sense to
share code between them.


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