linux-kernel - Re: [PATCH 2/2] drm: bridge: add sil902x DT bindings doc

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Date:	Wed, 6 Jan 2016 14:24:57 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Rob Herring <robh@...nel.org>
Cc:	David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
	dri-devel@...ts.freedesktop.org, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm: bridge: add sil902x DT bindings doc

Hi Rob,

On Wed, 6 Jan 2016 07:19:59 -0600
Rob Herring <robh@...nel.org> wrote:

> On Wed, Jan 06, 2016 at 12:25:51PM +0100, Boris Brezillon wrote:
> > Add Sil9022 DT bindings description.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> > ---
> >  .../devicetree/bindings/display/bridge/sil902x.txt | 31 ++++++++++++++++++++++
> >  1 file changed, 31 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/sil902x.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/display/bridge/sil902x.txt b/Documentation/devicetree/bindings/display/bridge/sil902x.txt
> > new file mode 100644
> > index 0000000..7f1339f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/sil902x.txt
> > @@ -0,0 +1,31 @@
> > +sil902x HDMI bridge bindings
> > +
> > +Required properties:
> > +	- compatible: "sil,sil9022"
> > +	- reg: i2c address of the bridge
> > +	- reset-gpios: OF device-tree gpio specification for RST_N pin.
> > +
> > +Optional properties:
> > +	- interrupts-extended or interrupt-parent + interrupts: describe
> > +	  the interrupt line used to inform the host about hotplug events.
> > +
> > +Optional subnodes:
> > +	- video input: Device node can contain video input port node to
> > +	  connect the bridge to a display controller output (See this
> > +	  documentation [1]).
> > +
> > +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
> > +
> > +Example:
> > +	hdmi-bridge@39 {
> > +		compatible = "sil,sil9022";
> > +		reg = <0x39>;
> > +		reset-gpios = <&gpx1 5 1 0 0>;
> 
> 4 GPIO cells? Valid, but unusual.

Hehe, I blindly copied nxp,ptn3460 doc, which is defining such GPIO
descriptors :-). I can change that if you want.

> 
> > +		ports {
> > +			port@0 {
> 
> Either need a reg property here or drop the unit address. You could 
> remove ports as well.

Actually we'll likely define a 2nd port for the audio input, so I'd
prefer keeping the ports and @0 suffix and adding a reg property rather
than just defining port { ... };

Best Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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