linux-kernel - Re: [RFC] Device Tree Overlays Proposal (Was Re: capebus moving omap

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Message-ID: <20121115045718.GJ32290@truffula.fritz.box>
Date:	Thu, 15 Nov 2012 15:57:18 +1100
From:	David Gibson <david@...son.dropbear.id.au>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Stephen Warren <swarren@...dotorg.org>,
	Kevin Hilman <khilman@...com>, Matt Porter <mporter@...com>,
	Koen Kooi <koen@...inion.thruhere.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>,
	Deepak Saxena <dsaxena@...aro.org>,
	Scott Wood <scottwood@...escale.com>,
	Russ Dill <Russ.Dill@...com>, linux-omap@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [RFC] Device Tree Overlays Proposal (Was Re: capebus moving
 omap_devices to mach-omap2)

On Tue, Nov 13, 2012 at 03:38:18PM +0200, Pantelis Antoniou wrote:
> Hi Grant,
> 
> On Nov 13, 2012, at 2:24 PM, Grant Likely wrote:

> > On Tue, Nov 13, 2012 at 8:09 AM, Pantelis Antoniou
[snip]
> My intention wasn't never to make overlays overly portable. My intention
> was to make them in a way that portability can be introduced if the boards
> are 'close' enough, but not for arbitrary boards.
> 
> There have to be compatible interfaces both on the base, and the overlay
> dtbs.

Right.  And this is why I'm arguing that those interfaces should be
described explicitly - using existing OF mechanisms like interrupt-map
where possible, rather than having a very general, but very low-level
interface to make arbitrary changes to the DT.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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