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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Date:	Sat, 27 Jul 2013 17:16:34 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	"jonsmirl@...il.com" <jonsmirl@...il.com>
Cc:	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>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	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 10:14 PM, jonsmirl@...il.com <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.

+1.

If we want to keep the schema stable, it has to be defined and described
explicitly with one language, just like syscall ABI: C type/API exported to
userspace header file.


Thanks,
-- 
Ming Lei
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