Re: [Ksummit-2013-discuss] DT bindings as ABI [was: Do we havepeople interested in device tree janitoring / cleanup?]

[Arend van Spriel]

On 07/27/2013 10:01 PM, jonsmirl@xxxxxxxxx wrote:
> On Sat, Jul 27, 2013 at 3:45 PM, Grant Likely <grant.likely@xxxxxxxxxxxx> wrote:
> > On Sat, Jul 27, 2013 at 4:59 AM, Arend van Spriel <arend@xxxxxxxxxxxx> 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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