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

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Date:	Mon, 28 Apr 2014 08:52:04 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	Mark Rutland <mark.rutland@....com>
CC:	"broonie@...nel.org" <broonie@...nel.org>,
	"rob@...dley.net" <rob@...dley.net>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"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 23, 2014 at 07:46:34AM +0100, Xiubo Li wrote:
> > Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
> > ---
> >  .../bindings/regmap/regmap-endianness.txt          | 48
> ++++++++++++++++++++++
> >  1 file changed, 48 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/regmap/regmap-
> endianness.txt
> >
> > diff --git a/Documentation/devicetree/bindings/regmap/regmap-endianness.txt
> b/Documentation/devicetree/bindings/regmap/regmap-endianness.txt
> > new file mode 100644
> > index 0000000..1d838c5
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/regmap/regmap-endianness.txt
> > @@ -0,0 +1,48 @@
> > +Device-Tree bindings for regmap endianness
> 
> As regmap is a Linux internal detail, I don't see why it needs to leak
> into bindings.
> 
> > +Required properties:
> > +- regmap-reg-endian: register endianness, see ../endianness/endianness.txt
> > +  for detail.
> > +- regmap-val-endian: value endianness, see ../endianness/endianness.txt for
> 
> I'm not familiar with regmap. What is the difference between register
> and value endianness?
>

Sorry for late, I'm very busy these days.

The register endianness here is used for the I2C and SPI protocol, which will
Send the register address(which maybe 8-bit or 16-bit) before its values.
 
BRs
Xiubo
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