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

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Message-ID: <2510029.UKsn4JyZOW@avalon>
Date:	Wed, 15 May 2013 15:24:23 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Lad Prabhakar <prabhakar.csengg@...il.com>
Cc:	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>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	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 Prabhakar,

Thank you for the patch.

On Wednesday 15 May 2013 18:22:29 Lad Prabhakar wrote:
> From: Lad, Prabhakar <prabhakar.csengg@...il.com>
> 
> This patch adds "field-active" and "sync-on-green" as part of
> endpoint properties and also support to parse them in the parser.
> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
> Cc: Guennadi Liakhovetski <g.liakhovetski@....de>
> Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Cc: Sakari Ailus <sakari.ailus@....fi>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Rob Landley <rob@...dley.net>
> Cc: devicetree-discuss@...ts.ozlabs.org
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: davinci-linux-open-source@...ux.davincidsp.com
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> ---
>  .../devicetree/bindings/media/video-interfaces.txt |    4 ++++
>  drivers/media/v4l2-core/v4l2-of.c                  |    6 ++++++
>  include/media/v4l2-mediabus.h                      |    2 ++
>  3 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt
> b/Documentation/devicetree/bindings/media/video-interfaces.txt index
> e022d2d..6bf87d0 100644
> --- a/Documentation/devicetree/bindings/media/video-interfaces.txt
> +++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
> @@ -101,6 +101,10 @@ Optional endpoint properties
>    array contains only one entry.
>  - clock-noncontinuous: a boolean property to allow MIPI CSI-2
> non-continuous clock mode.
> +-field-active: a boolean property indicating active high filed ID output
> + polarity is inverted.

Looks like we already have field-even-active property to describe the level of 
the field signal. Could you please check whether it fulfills your use cases ? 
Sorry for not pointing you to it earlier.

> +-sync-on-green: a boolean property indicating to sync with the green signal
> in + RGB.
> 
> 
>  Example
> diff --git a/drivers/media/v4l2-core/v4l2-of.c
> b/drivers/media/v4l2-core/v4l2-of.c index aa59639..1d59455 100644
> --- a/drivers/media/v4l2-core/v4l2-of.c
> +++ b/drivers/media/v4l2-core/v4l2-of.c
> @@ -100,6 +100,12 @@ static void v4l2_of_parse_parallel_bus(const struct
> device_node *node, if (!of_property_read_u32(node, "data-shift", &v))
>  		bus->data_shift = v;
> 
> +	if (of_get_property(node, "field-active", &v))
> +		flags |= V4L2_MBUS_FIELD_ACTIVE;
> +
> +	if (of_get_property(node, "sync-on-green", &v))
> +		flags |= V4L2_MBUS_SOG;
> +
>  	bus->flags = flags;
> 
>  }
> diff --git a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h
> index 83ae07e..b95553d 100644
> --- a/include/media/v4l2-mediabus.h
> +++ b/include/media/v4l2-mediabus.h
> @@ -40,6 +40,8 @@
>  #define V4L2_MBUS_FIELD_EVEN_HIGH		(1 << 10)
>  /* FIELD = 1/0 - Field1 (odd)/Field2 (even) */
>  #define V4L2_MBUS_FIELD_EVEN_LOW		(1 << 11)
> +#define V4L2_MBUS_FIELD_ACTIVE			(1 << 12)
> +#define V4L2_MBUS_SOG				(1 << 13)
> 
>  /* Serial flags */
>  /* How many lanes the client can use */
-- 
Regards,

Laurent Pinchart

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