Date: Fri, 26 Jul 2013 10:01:15 +0200
From: Richard Cochran <richardcochran@gmail.com>
To: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "ksummit-2013-discuss@lists.linuxfoundation.org" 
	<ksummit-2013-discuss@lists.linuxfoundation.org>,
        Russell King - ARM Linux <linux@arm.linux.org.uk>,
        Samuel Ortiz <sameo@linux.intel.com>, Pawel Moll <Pawel.Moll@arm.com>,
        Stephen Warren <swarren@wwwdotorg.org>,
        Catalin Marinas <Catalin.Marinas@arm.com>,
        Domenico Andreoli <cavokz@gmail.com>,
        "rob.herring@calxeda.com" <rob.herring@calxeda.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Olof Johansson <olof@lixom.net>, Dave P Martin <Dave.Martin@arm.com>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
        Ian Campbell <ian.campbell@citrix.com>
Subject: Re: DT bindings as ABI [was: Do we have people interested in device
 tree janitoring / cleanup?]
Message-ID: <20130726080115.GA5436@netboy>
References: <CAOesGMhJ+je8FZqeFxhAcYwU0CHYer+aGP6DA_8x3azrzfA2sw@mail.gmail.com>
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 <51F168FC.9070906@wwwdotorg.org>
 <20130725182920.GA24955@e106331-lin.cambridge.arm.com>
 <20130725184834.GA8296@netboy>
 <20130725213753.GC17616@obsidianresearch.com>
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On Thu, Jul 25, 2013 at 03:37:53PM -0600, Jason Gunthorpe wrote:
> 
> We use DT has a kernel configuration input. Our environment is
> designed to guarantee 100% that the kernel and DT match exactly. DT
> very deliberately isn't an ABI boundary in our systems.

Think about what you just said.

The DT describes the *hardware* not the kernel. Why should you ever
need to update your DT at all?

(Hint: the answer is, because the DT system is broken.)

Thanks,
Richard
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