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Date:	Fri, 21 Mar 2014 15:13:38 +0100
From:	Laurent Pinchart <>
To:	Tomi Valkeinen <>
Cc:	Grant Likely <>,
	Philipp Zabel <>,
	Russell King - ARM Linux <>,
	Mauro Carvalho Chehab <>,
	Rob Herring <>,
	Sylwester Nawrocki <>,
	Kyungmin Park <>,,,,
	Guennadi Liakhovetski <>,
	Philipp Zabel <>
Subject: Re: [PATCH v4 1/3] [media] of: move graph helpers from drivers/media/v4l2-core to drivers/of

Hi Tomi,

On Friday 21 March 2014 15:37:17 Tomi Valkeinen wrote:
> On 21/03/14 00:32, Laurent Pinchart wrote:
> > The OF graph bindings documentation could just specify the ports node as
> > optional and mandate individual device bindings to specify it as mandatory
> > or forbidden (possibly with a default behaviour to avoid making all
> > device bindings too verbose).
> Isn't it so that if the device has one port, it can always do without
> 'ports', but if it has multiple ports, it always has to use 'ports' so
> that #address-cells and #size-cells can be defined?

You can put the #address-cells and #size-cells property in the device node 
directly without requiring a ports subnode.

> If so, there's nothing left for the individual device bindings to decide.


Laurent Pinchart

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