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: <CACxGe6vw9=y5a+EgF1gO39SwGAdGofD2MYjyJ3jYu6uN3ke70A@mail.gmail.com>
Date:	Sat, 27 Jul 2013 21:28:15 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	"jonsmirl@...il.com" <jonsmirl@...il.com>
Cc:	Arend van Spriel <arend@...adcom.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Richard Cochran <richardcochran@...il.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 Sat, Jul 27, 2013 at 2:25 PM, Grant Likely <grant.likely@...retlab.ca> wrote:
> On Sat, Jul 27, 2013 at 2:01 PM, jonsmirl@...il.com <jonsmirl@...il.com> wrote:
>> On Sat, Jul 27, 2013 at 3:45 PM, Grant Likely <grant.likely@...retlab.ca> wrote:
>>> On Sat, Jul 27, 2013 at 4:59 AM, Arend van Spriel <arend@...adcom.com> wrote:
>>>> Let's see how many people go and scream if I say this: Too bad .dts files
>>>> are not done using XML format as DT bindings could be described using XML
>>>> Schema.
>>>
>>> Draft an example and show us how it would look!  :-)  There is
>>> absolutely nothing preventing us from expressing a DT in XML format,
>>> or even using XSLT to define DT schema while still using our current
>>> .dts syntax. It would be trivial to do lossless translation between
>>> .dts syntax and xml.
>>>
>>> The problem that I have with XML and XSLT is that it is very verbose
>>> and not entirely friendly to mere-mortals. However, I'm more than
>>> willing to be proved wrong on this point.
>>
>> I considered this approach a while ago and discarded it. It would work
>> but it is just too much of a Frankenstein monster.
>>
>> Much cleaner to modify dtc to take a schema as part of the compilation
>> process. The schema language itself has no requirement to look like
>> DTS syntax. Whoever wrote dtc probably has a favorite language that
>> would be good for writing schemas in.
>
> Making it part of dtc is a required feature as far as I'm concerned.
> Using XML/XSLT and dtc-integration are not mutually exclusive, but I
> digress.

Oops, ignore the XSLT bit. XSLT isn't schema and has no bearing on the
discussion of schema. Sorry for the noise.

g.
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