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:	Mon, 29 Jul 2013 11:19:10 +0200
From:	"Arend van Spriel" <arend@...adcom.com>
To:	"jonsmirl@...il.com" <jonsmirl@...il.com>
cc:	"Grant Likely" <grant.likely@...retlab.ca>,
	"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 07/27/2013 10:01 PM, 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.

Ah, but he is so cute. At least I do not think it is more monstrous as 
the bindings files. I just browsed through a couple of arm binding files 
as I felt challenged to come up with an example. I did not get the 
impression that there is some kind of template in place to get consitent 
bindings descriptions.

> 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.

Not sure if I can follow here. I guess you mean the dts compilation, 
right? There are tools freely available to validate XML files against 
XSD specification files. As an example libxml2 has support for it. I 
suspect it is not desired to have a dependency for DTC with an 
out-of-tree library, but it could be incorporated and have DTC spew the 
validation results.

Regards,
Arend


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