linux-kernel - Re: [PATCH] media: i2c: tvp7002: enable TVP7002 decoder for media controller based usage

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Message-ID: <CA+V-a8tE4SHk2VCRPBTX5CixPip95KduzMSdGt7PEWtFLu52gQ@mail.gmail.com>
Date:	Mon, 29 Apr 2013 23:20:24 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.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>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>
Subject: Re: [PATCH] media: i2c: tvp7002: enable TVP7002 decoder for media
 controller based usage

Hi Laurent,

On Mon, Apr 29, 2013 at 11:06 PM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> Hi Prabhakar,
>
> On Monday 29 April 2013 23:00:26 Prabhakar Lad wrote:
>> On Mon, Apr 29, 2013 at 7:57 PM, Laurent Pinchart wrote:
>> > On Friday 26 April 2013 13:35:35 Prabhakar Lad wrote:
>> >> From: Lad, Prabhakar <prabhakar.csengg@...il.com>
>> >>
>> >> This patch enables tvp7002 decoder driver for media controller
>> >> based usage by adding v4l2_subdev_pad_ops  operations support
>> >> for enum_mbus_code, set_pad_format, get_pad_format and
>> >> media_entity_init()
>> >> on probe and media_entity_cleanup() on remove.
>> >>
>> >> The device supports 1 output pad and no input pads.
>> >
>> > We should actually define input pads, connected to connector entities, but
>> > that's out of scope for this patch.
>> >
>> >> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
>> >> ---
>
[snip]

>> >> +/* media pad related operation handlers */
>> >> +static const struct v4l2_subdev_pad_ops tvp7002_pad_ops = {
>> >> +     .enum_mbus_code = tvp7002_enum_mbus_code,
>> >> +     .get_fmt = tvp7002_get_pad_format,
>> >> +     .set_fmt = tvp7002_set_pad_format,
>> >
>> > We will need to define pad-aware DV timings operations.
>>
>> I didn't get you this?
>
> We will need to extend the pad operations (struct v4l2_subdev_pad_ops) with
> operations to enumerate, get and set DV timings at the pad level.
>
not sure if exposing get and set DV timings at the pad level would be a better
idea, timings for pad's would be the same always and anyways we get DV timings
on video node. I cant think of usecase where we require get and set DV
timings at the pad level.

Regards,
--Prabhakar Lad
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