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 19:36:18 -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 15:42:54 -0600
Grant Likely <grant.likely@...retlab.ca> wrote:

> On Tue, Jun 29, 2010 at 9:03 AM, Andres Salomon <dilinger@...ued.net>
> wrote:
[...]
> 
> >  Sparc and OLPC have very similar
> > mechanisms for getting device tree info from OFW, so it makes sense
> > to share code between them.
> 
> Other than the flattened tree step; is the powerpc method dissimilar
> from the Sparc and OLPC method for talking to OFW?  (This is not a
> rhetorical question, I'm want to know if I'm missing some details).
> The main difference I know about is that OFW can still kept alive at
> runtime for sparc, which powerpc does not do.  However, keeping OFW
> callable is a separate issue from how to extract the device tree.
> 

After having a look at powerpc's flatten_device_tree, I don't see any
obvious reason why OLPC couldn't use this (though it still strikes me
as weird to go from prom->fdt->dt when the option of prom->dt is
available and less complex). Do you already have the patches that put
this into drivers/of/?
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