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: <51F1C48C.7010408@wwwdotorg.org>
Date:	Thu, 25 Jul 2013 17:36:28 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	Jason Cooper <jason@...edaemon.net>,
	Rob Herring <robherring2@...il.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>,
	Domenico Andreoli <cavokz@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	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 07/25/2013 02:53 PM, Ben Hutchings wrote:
> On Thu, Jul 25, 2013 at 04:32:28PM -0400, Jason Cooper wrote:
> [...]
>> One of the things I've been trying to square up in my head is how to
>> retain the history of the binding when moving to the new tree.  My
>> current idea was to clone the kernel tree, add one patch deleting
>> everything but the bindings and dts files, and one more patch moving
>> things where we want them (arch/{powerpc,arm}/boot/dts -> dts).
>>
>> Then, as needed, we could merge a kernel version tag and delete
>> everything we don't need (code) in the merge commit.
>>
>> The downside of this is it would be messy, the upside is that we could
>> closely track the kernel tree (until the bindings and dts are moved
>> out), and retain the history of the bindings and dts files.
> [...]
> 
> It's *extremely* messy, but 'git filter-branch' might help to make a
> clean tracking branch preserving history of just DT files.  David
> Woodhouse did something like that for the linux-firmware repo
> initially.

Ian Campbell is already working on exactly this solution:
https://lkml.org/lkml/2013/7/23/547

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