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

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Message-ID: <51F1737A.9020205@wwwdotorg.org>
Date:	Thu, 25 Jul 2013 11:50:34 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Olof Johansson <olof@...om.net>
CC:	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <Catalin.Marinas@....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>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	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>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ian.campbell@...rix.com>
Subject: Re: DT bindings as ABI [was: Do we have people interested in device
 tree janitoring / cleanup?]

On 07/25/2013 11:25 AM, Olof Johansson wrote:
> On Thu, Jul 25, 2013 at 11:05 AM, Stephen Warren <swarren@...dotorg.org> wrote:
...
>> On another related topic, something that may be useful for the DT
>> bindings reviewer team is a basic checklist for new DT bindings.
>> Something similar to Fedora's package review checklist. Perhaps also
>> (yet another?) document on a bit of DT philosophy. If this sounds
>> useful, I could try and take a stab at some basic initial version.
> 
> Sounds reasonable. Starting with one of the existing ones instead of
> from scratch is a reasonable approach. A checklist and a best
> practices doc would come a long way.

Do you have a link to an existing check-list? I know there's plenty of
best practices information out there to build on.

>> We also need to decide (or just document) exactly what "describes the
>> HW" means; see the thread on thermal limits, and consider the extension
>> of describing hard/absolute thermal limits to describing use-cased base
>> thermal profiles using the same schema, or not allowing that.
> 
> Yes indeed. A basic binding need just specify what the specific
> hardware IP is, if the rest of the configuration of the IP can be
> determined at runtime through other means (i.e. by autoprobing). It's
> stuff beyond that that gets very complicated.
> 
> To talk semi-specifics: What about USB PHY tunings for a specific
> board,

I was thinking more about the slightly blurry line between representing
HW and representing policy, but the example you gave certainly needs
consideration too.
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