linux-kernel - Re: [PATCH v3 2/2] dt-bindings: imx: ldb: Add ddc-i2c-bus property

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Message-ID: <20160503160647.GA10680@rob-hp-laptop>
Date:	Tue, 3 May 2016 11:06:47 -0500
From:	Rob Herring <robh@...nel.org>
To:	Philipp Zabel <p.zabel@...gutronix.de>
Cc:	Akshay Bhat <akshay.bhat@...esys.com>, airlied@...ux.ie,
	steve_longerbeam@...tor.com, dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] dt-bindings: imx: ldb: Add ddc-i2c-bus property

On Fri, Apr 29, 2016 at 09:44:12AM +0200, Philipp Zabel wrote:
> Am Donnerstag, den 28.04.2016, 16:48 -0500 schrieb Rob Herring:
> > On Wed, Apr 27, 2016 at 04:23:34PM -0400, Akshay Bhat wrote:
> > > Document the ddc-i2c-bus property used by imx-ldb driver to read EDID
> > > information via I2C interface.
> > > 
> > > Signed-off-by: Akshay Bhat <akshay.bhat@...esys.com>
> > > ---
> > > 
> > > v3:
> > > Newly added.
> > > 
> > >  Documentation/devicetree/bindings/display/imx/ldb.txt | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/display/imx/ldb.txt b/Documentation/devicetree/bindings/display/imx/ldb.txt
> > > index 0a175d9..a407462 100644
> > > --- a/Documentation/devicetree/bindings/display/imx/ldb.txt
> > > +++ b/Documentation/devicetree/bindings/display/imx/ldb.txt
> > > @@ -62,6 +62,7 @@ Required properties:
> > >     display-timings are used instead.
> > >  
> > >  Optional properties (required if display-timings are used):
> > 
> > The required part doesn't make sense if you add this, but...
> > 
> > > + - ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
> > 
> > Really, this should be part of a connector node since i2c goes from the 
> > i2c controller to a connector and is not part of the display controller.
> 
> If the ddc i2c bus does indeed go through a connector, yes. Would that
> warrant a generic "lvds-connector" binding for all those different types
> of internal LVDS connectors?

Probably an overkill for that case. It could be part of the panel node, 
but I'm reluctant to define a 3rd way. So this is fine as is.

Acked-by: Rob Herring <robh@...nel.org>

Rob