linux-kernel - Re: [Ksummit-2013-discuss] DT bindings as ABI [was: Do we have people interested in device tree janitoring / cleanup?]

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Message-ID: <CACxGe6v9G0aeAHQoymhg1=aTyNqf2w9OEcuK06GR=8rXCbB+fQ@mail.gmail.com>
Date:	Sat, 27 Jul 2013 13:37:19 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"jonsmirl@...il.com" <jonsmirl@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Jason Cooper <jason@...edaemon.net>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"ksummit-2013-discuss@...ts.linuxfoundation.org" 
	<ksummit-2013-discuss@...ts.linuxfoundation.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Richard Cochran <richardcochran@...il.com>,
	Domenico Andreoli <cavokz@...il.com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Dave P Martin <Dave.Martin@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Ksummit-2013-discuss] DT bindings as ABI [was: Do we have people
 interested in device tree janitoring / cleanup?]

On Fri, Jul 26, 2013 at 8:21 AM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Fri, Jul 26, 2013 at 10:14:32AM -0400, jonsmirl@...il.com wrote:
>> Yes, yes - that's why the schema should be written down and used as a
>> validation input to dtc. Then dtc can spit out errors for non-standard
>> items. There would be two versions - the standard one and a legacy one
>> that includes the standard one plus the hacks that can't be undone.
>>
>> But more importantly it provides a framework for people creating new
>> node definitions. Now they can't work in a vacuum and come up with
>> random names and structure for everything.
>>
>> Most of the problems express in the thread would go away if the schema
>> was written down and discussed. The rule going forward would be no new
>> nodes that aren't part of the standard schema.
>
> So this is why I'm seeing patches just a short time ago removing existing
> compatible strings from the DT descriptions and associated driver, and
> replacing them with new ones... meaning that the old DT files won't work
> with newer kernels.
>
> What that means is using the descriptions as the schema won't catch that
> because they're changing those as well to match.
>
> There's a solution to that: dtc becomes a separate project external to
> the kernel which also contains the schemas that it verifies against.
> That way, if you want to make changes such as that above, you need to
> get it past not only kernel people but also past dtc maintainers -
> which increases the chances of such stuff being caught.

+1

dtc has always been a separate project that happens to be mirrored in
the kernel tree, but the bindings need to come out be turned into
schema that can be validated.

g.
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