linux-kernel - RE: [PATCHv2 2/3] regmap: Add the DT binding documentation for endianness

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Date:	Thu, 3 Apr 2014 07:04:00 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	Mark Brown <broonie@...nel.org>
CC:	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCHv2 2/3] regmap: Add the DT binding documentation for
 endianness

> Subject: Re: [PATCHv2 2/3] regmap: Add the DT binding documentation for
> endianness
> 
> On Wed, Apr 02, 2014 at 06:09:08PM +0800, Xiubo Li wrote:
> 
> > +sai2: sai@...31000 {
> > +	      compatible = "fsl,vf610-sai";
> > +	      reg = <0x40031000 0x1000>;
> > +	      ...
> > +	      val-endian = 'LE';
> > +};
> 
> This is mostly OK as a binding (though it should be CCed to the DT list
> and maintiners as all DT bindings should) except using upper case
> doesn't really seem idiomatic for DT - lower case is more normal - 

I will your advices.


> and I
> don't think we can make these properties mandatory in themselves.
> Individual bindings would need to make them mandatory.  It's also odd to
> have a mandatory property which may be absent!

Well, yes, It is.

The absent one is just to compatible with the old drivers.



> 
> It'd probably be better if the binding defined what the default
> endianess was too, or just didn't say what happens in cases where
> nothing is specified, the latter seems better.  

I will think it over carefully.


> Generally just not
> mentioning regmap is better for a binding definition, the binding should
> be usable by all OSs and not just Linux.

How about move the endianness OF parsing to the driver/of/ ?
Is this will be better ?

Thanks,

BRs
Xiubo



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