linux-kernel - Re: [PATCH 11/15] [media] Deprecate v4l2_mbus

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Date:	Wed, 5 Nov 2014 16:30:49 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Hans Verkuil <hansverk@...co.com>
Cc:	Sakari Ailus <sakari.ailus@....fi>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-api@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: [PATCH 11/15] [media] Deprecate v4l2_mbus_pixelcode

On Wed, 05 Nov 2014 16:19:56 +0100
Hans Verkuil <hansverk@...co.com> wrote:

> 
> 
> On 11/05/14 16:15, Boris Brezillon wrote:
> > On Wed, 5 Nov 2014 17:08:15 +0200
> > Sakari Ailus <sakari.ailus@....fi> wrote:
> > 
> >> Hi Boris,
> >>
> >> On Tue, Nov 04, 2014 at 10:55:06AM +0100, Boris Brezillon wrote:
> >>> The v4l2_mbus_pixelcode enum (or its values) should be replaced by the
> >>> media_bus_format enum.
> >>> Keep this enum in v4l2-mediabus.h and create a new header containing
> >>> the v4l2_mbus_framefmt struct definition (which is not deprecated) so
> >>> that we can add a #warning statement in v4l2-mediabus.h and hopefully
> >>> encourage users to move to the new definitions.
> >>>
> >>> Replace inclusion of v4l2-mediabus.h with v4l2-mbus.h in all common headers
> >>> and update the documentation Makefile to parse v4l2-mbus.h instead of
> >>> v4l2-mediabus.h.
> >>>
> >>> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> >>> ---
> >>>  Documentation/DocBook/media/Makefile |  2 +-
> >>>  include/media/v4l2-mediabus.h        |  2 +-
> >>>  include/uapi/linux/Kbuild            |  1 +
> >>>  include/uapi/linux/v4l2-mbus.h       | 35 +++++++++++++++++++++++++++++++++++
> >>>  include/uapi/linux/v4l2-mediabus.h   | 26 ++++----------------------
> >>
> >> I would keep the original file name, even if the compatibility definitions
> >> are there. I don't see any harm in having them around as well.
> >>
> > 
> > That's the part I was not sure about.
> > The goal of this patch (and the following ones) is to deprecate
> > v4l2_mbus_pixelcode enum and its values by adding a #warning when
> > v4l2-mediabus.h file is included, thus encouraging people to use new
> > definitions.
> 
> Since v4l2-mediabus.h contains struct v4l2_mbus_framefmt this header remains
> a legal header, so you can't use #warning here in any case.
> 

Actually this patch moves the struct v4l2_mbus_framefmt definition into
another header before adding the warning statement.

Anyway, this is really a detail, and if everybody agrees that we should
just leave the old definition in place, I'm fine with that.


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