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

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Message-ID: <5102E2F4.80604@gmail.com>
Date:	Fri, 25 Jan 2013 20:54:28 +0100
From:	Sylwester Nawrocki <sylvester.nawrocki@...il.com>
To:	Prabhakar Lad <prabhakar.csengg@...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>,
	Manjunath Hadli <manjunath.hadli@...com>,
	"Lad, Prabhakar" <prabhakar.lad@...com>
Subject: Re: [PATCH 1/2] media: add support for decoder subdevs along with
 sensor and others

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. :)


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

--

Regards,
Sylwester
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