linux-kernel - Re: [PATCH RFC] media: OF: add field-active and sync-on-green endpoint properties

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Message-ID: <CA+V-a8s_G78tDCGebUEw_WNmOmxHzEpsNjJ2w4oTEJ=QZzqcUQ@mail.gmail.com>
Date:	Thu, 16 May 2013 16:22:20 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Sylwester Nawrocki <sylvester.nawrocki@...il.com>
Cc:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Sakari Ailus <sakari.ailus@....fi>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH RFC] media: OF: add field-active and sync-on-green
 endpoint properties

Hi Sylwester,

On Thu, May 16, 2013 at 4:13 PM, Sylwester Nawrocki
<sylvester.nawrocki@...il.com> wrote:
> Hi,
>
>
> On 05/16/2013 06:53 AM, Prabhakar Lad wrote:
>>>>
[Snip]
>> May be we rename "field-active" to "fid-pol" ?
>
>
> I guess we failed to clearly describe the 'field-even-active' property then.
> It seems to be exactly what you need.
>
> It is not enough to say e.g. field-active = <1>;, because it would not have
> been clear which field it refers to, odd or even ? Unlike VSYNC, HSYNC both
> levels of the FIELD signal are "active", there is no "idle" state for FIELD.
>
> So field-even-active = <1>; means the FIELD signal at logic high level
> indicates EVEN field _and_ this implies FIELD = 0 indicates ODD field, i.e.
>
> FIELD = 0 => odd field
> FIELD = 1 => even field
>
> For field-even-active = <0>; it is the other way around:
>
> FIELD = 0 => even field
> FIELD = 1 => odd field
>
Thanks that makes it clear :)

> It looks like only "sync-on-green" property is missing. BTW, is it really
> commonly used ? What drivers would need it ?
> I'm not against making it a common property, it's just first time I see it.
>
I have comes across a decoder tvp7002 which uses it, may be Laurent/Hans/Sakari
may point much more devices.

Regards,
--Prabhakar Lad
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