linux-kernel - Re: [PATCH] media: platform: add VPFE capture driver support for AM437X

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Message-ID: <547D6B07.6050803@xs4all.nl>
Date:	Tue, 02 Dec 2014 08:32:23 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
CC:	LMML <linux-media@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-api <linux-api@...r.kernel.org>,
	Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [PATCH] media: platform: add VPFE capture driver support for
 AM437X

On 12/01/2014 11:27 PM, Prabhakar Lad wrote:
> Hi Hans,
> 
> On Mon, Dec 1, 2014 at 11:00 AM, Hans Verkuil <hverkuil@...all.nl> wrote:
>> On 12/01/2014 11:11 AM, Hans Verkuil wrote:
>>> Hi all,
>>>
>>> Thanks for the patch, review comments are below.
>>>
>>> For the next version I would appreciate if someone can test this driver with
>>> the latest v4l2-compliance from the v4l-utils git repo. If possible test streaming
>>> as well (v4l2-compliance -s), ideally with both a sensor and a STD receiver input.
>>> But that depends on the available hardware of course.
>>>
>>> I'd like to see the v4l2-compliance output. It's always good to have that on
>>> record.
>>>
>>>
>>> On 11/24/2014 02:10 AM, Lad, Prabhakar wrote:
>>>> From: Benoit Parrot <bparrot@...com>
>>>>
>>>> This patch adds Video Processing Front End (VPFE) driver for
>>>> AM437X family of devices
>>>> Driver supports the following:
>>>> - V4L2 API using MMAP buffer access based on videobuf2 api
>>>> - Asynchronous sensor/decoder sub device registration
>>>> - DT support
>>>>
>>>> Signed-off-by: Benoit Parrot <bparrot@...com>
>>>> Signed-off-by: Darren Etheridge <detheridge@...com>
>>>> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
>>>> ---
>>>>  .../devicetree/bindings/media/ti-am437xx-vpfe.txt  |   61 +
>>>>  MAINTAINERS                                        |    9 +
>>>>  drivers/media/platform/Kconfig                     |    1 +
>>>>  drivers/media/platform/Makefile                    |    2 +
>>>>  drivers/media/platform/am437x/Kconfig              |   10 +
>>>>  drivers/media/platform/am437x/Makefile             |    2 +
>>>>  drivers/media/platform/am437x/vpfe.c               | 2764 ++++++++++++++++++++
>>>>  drivers/media/platform/am437x/vpfe.h               |  286 ++
>>>>  drivers/media/platform/am437x/vpfe_regs.h          |  140 +
>>>>  include/uapi/linux/Kbuild                          |    1 +
>>>>  include/uapi/linux/am437x_vpfe.h                   |  122 +
>>>>  11 files changed, 3398 insertions(+)
>>
>> Can the source names be improved? There are too many 'vpfe' sources.
>> Perhaps prefix all with 'am437x-'?
>>
> I did think of it but, dropped it as anyway the source's are present
> in am437x folder, again naming the files am437x-xxx.x didn't make
> me feel good. If you still insists I'll do it.

Yes, please do. If you look at most other drivers they all have a prefix.

Another reason is that the media_build system expects unique names.

Regards,

	Hans

>> In general I prefer '-' over '_' in a source name: it's looks better
>> IMHO.
>>
> I am almost done with all the review comments, if we take a decision
> on this quickly I can post a v2 soon.
> 
>> One question, unrelated to this patch series:
>>
>> Prabhakar, would it make sense to look at the various existing TI sources
>> as well and rename them to make it more explicit for which SoCs they are
>> meant? Most are pretty vague with variations on vpe, vpif, vpfe, etc. but
>> no reference to the actual SoC they are for.
>>
> vpe - definitely needs to be changed.
> vpif - under davinci is common for (Davinci series
> dm6467/dm6467t/omapl138/am1808)
> vpfe -  under davinci is common for (Davinci series dm36x/dm6446/dm355)
> 
> I am falling short of names for renaming this common drivers :)
> 
> Thanks,
> --Prabhakar Lad
> --
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