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Date:	Fri, 21 Mar 2014 14:16:20 +0200
From:	Tomi Valkeinen <>
To:	Grant Likely <>,
	Andrzej Hajda <>,
	Laurent Pinchart <>
CC:	Philipp Zabel <>,
	Sascha Hauer <>,
	Rob Herring <>,
	Russell King - ARM Linux <>,
	Mauro Carvalho Chehab <>,
	Rob Herring <>,
	Sylwester Nawrocki <>,
	Kyungmin Park <>,
	"" <>,
	"" <>,
	"" <>,
	Philipp Zabel <>
Subject: Re: [RFC PATCH] [media]: of: move graph helpers from drivers/media/v4l2-core
 to drivers/of

On 21/03/14 13:47, Grant Likely wrote:

> I'm firm on the opinion that the checking must also happen at runtime.
> The biggest part of my objection has been how easy it would be to get a
> linkage out of sync, and dtc is not necessarily the last tool to touch
> the dtb before the kernel gets booted. I want the kernel to flat out
> reject any linkage that is improperly formed.

Isn't it trivial to verify it with the current v4l2 bindings? And
endpoint must have a 'remote-endpoint' property, and the endpoint on the
other end must have similar property, pointing in the first endpoint.
Anything else is an error.

I agree that it's easier to write bad links in the dts with
double-linking than with single-linking, but it's still trivial to
verify it in the kernel.


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