linux-kernel - Re: [PATCH v2 1/5] video: move mediabus format definition to a more standard place

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Date:	Mon, 29 Sep 2014 23:41:09 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] video: move mediabus format definition to a more standard place

Hi Boris,

Thank you for the patch.

On Monday 29 September 2014 16:02:39 Boris Brezillon wrote:
> Rename mediabus formats and move the enum into a separate header file so
> that it can be used by DRM/KMS subsystem without any reference to the V4L2
> subsystem.
> 
> Old V4L2_MBUS_FMT_ definitions are now macros that points to VIDEO_BUS_FMT_
> definitions.
> 
> Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> Acked-by: Guennadi Liakhovetski <g.liakhovetski@....de>
> ---
>  include/uapi/linux/Kbuild             |   1 +
>  include/uapi/linux/v4l2-mediabus.h    | 183 +++++++++++++------------------
>  include/uapi/linux/video-bus-format.h | 127 +++++++++++++++++++++++
>  3 files changed, 207 insertions(+), 104 deletions(-)
>  create mode 100644 include/uapi/linux/video-bus-format.h

One of the self-inflicted rules in V4L2 is to properly document every new 
media bus format when adding it to the kernel. The documentation is located in 
Documentation/DocBook/media/v4l/subdev-formats.xml. If we move the formats to 
a centralized header (which I believe is a good idea), we should also update 
the documentation, and possibly its location. I really want to avoid getting 
undocumented formats merged, and this will happen if we don't make the rule 
clear and/or don't make the documentation easily accessible.

Incidentally, patch 2/5 in this series is missing a documentation update ;-)

-- 
Regards,

Laurent Pinchart

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