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:	Sun, 28 Jul 2013 15:19:03 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	Arend van Spriel <arend@...adcom.com>,
	Olof Johansson <olof@...om.net>,
	Mark Brown <broonie@...nel.org>,
	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>,
	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 Sun, Jul 28, 2013 at 11:12:53AM +0200, Tomasz Figa wrote:

> I'm not really sure what effect on users this has. Maybe you should define 
> "users".

...

> Care to explain this reasoning?

Use Case
~~~~~~~~

User acquires a machine running ARM Linux version 3.x, with u-boot
and dtb in a read only flash partition. The board boots and works just
fine. However, for his application, the user requires a new kernel
feature that appeared in version 3.y where y > x. He compiles the new
kernel, and it also works.

Thanks,
Richard



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