linux-kernel - Re: [PATCH 1/2] media: add support for decoder subdevs along with sensor and others

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Date:	Sat, 26 Jan 2013 10:07:36 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Sylwester Nawrocki <sylvester.nawrocki@...il.com>
Cc:	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	"Lad, Prabhakar" <prabhakar.lad@...com>
Subject: Re: [PATCH 1/2] media: add support for decoder subdevs along with
 sensor and others

Hi Sylwester,

On Sat, Jan 26, 2013 at 1:24 AM, Sylwester Nawrocki
<sylvester.nawrocki@...il.com> wrote:
> Hi Prahakar,
>
>
> On 01/25/2013 08:01 AM, Prabhakar Lad wrote:
>>
>> From: Manjunath Hadli<manjunath.hadli@...com>
>>
>> A lot of SOCs including Texas Instruments Davinci family mainly use
>> video decoders as input devices. Here the initial subdevice node
>> from where the input really comes is this decoder, for which support
>> is needed as part of the Media Controller infrastructure. This patch
>> adds an additional flag to include the decoders along with others,
>> such as the sensor and lens.
>>
>> Signed-off-by: Manjunath Hadli<manjunath.hadli@...com>
>> Signed-off-by: Lad, Prabhakar<prabhakar.lad@...com>
>> ---
>>   include/uapi/linux/media.h |    1 +
>>   1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
>> index 0ef8833..fa44ed9 100644
>> --- a/include/uapi/linux/media.h
>> +++ b/include/uapi/linux/media.h
>> @@ -56,6 +56,7 @@ struct media_device_info {
>>   #define MEDIA_ENT_T_V4L2_SUBDEV_SENSOR        (MEDIA_ENT_T_V4L2_SUBDEV +
>> 1)
>>   #define MEDIA_ENT_T_V4L2_SUBDEV_FLASH (MEDIA_ENT_T_V4L2_SUBDEV + 2)
>>   #define MEDIA_ENT_T_V4L2_SUBDEV_LENS  (MEDIA_ENT_T_V4L2_SUBDEV + 3)
>> +#define MEDIA_ENT_T_V4L2_SUBDEV_DECODER        (MEDIA_ENT_T_V4L2_SUBDEV +
>> 4)
>
>
> Such a new entity type needs to be documented in the media DocBook [1].
> It probably also deserves a comment here, as DECODER isn't that obvious
> like the other already existing entity types. I heard people referring
> to a device that encodes analog (composite) video signal into its digital
> representation as an ENCODER. :)
>
>
Thanks for pointing it :), I'll document it and post a v2.

Regards,
--Prabhakar Lad

> [1] http://hverkuil.home.xs4all.nl/spec/media.html#media-ioc-enum-entities
>
> --
>
> Regards,
> Sylwester
--
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