linux-kernel - Re: [PATCH RFC v2] media: tvp514x: add OF support

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Message-ID: <CA+V-a8vocaoA=zTkSGX7Mi5QdjhzZPCAd3SThFv3uKQxwSTpsA@mail.gmail.com>
Date:	Sun, 3 Feb 2013 21:42:14 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	LMML <linux-media@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	"Lad, Prabhakar" <prabhakar.lad@...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,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2] media: tvp514x: add OF support

Hi Laurent,

On Sun, Feb 3, 2013 at 6:44 PM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> Hi Prabhakar,
>
> On Sunday 03 February 2013 15:43:49 Prabhakar Lad wrote:
>> On Sat, Feb 2, 2013 at 4:07 AM, Sylwester Nawrocki wrote:
>> > On 01/29/2013 02:07 PM, Prabhakar Lad wrote:
>> > [...]
>> >
>> >> diff --git a/Documentation/devicetree/bindings/media/i2c/tvp514x.txt
>> >> b/Documentation/devicetree/bindings/media/i2c/tvp514x.txt
>> >> new file mode 100644
>> >> index 0000000..55d3ffd
>> >> --- /dev/null
>> >> +++ b/Documentation/devicetree/bindings/media/i2c/tvp514x.txt
>> >> @@ -0,0 +1,38 @@
>> >> +* Texas Instruments TVP514x video decoder
>> >> +
>> >> +The TVP5146/TVP5146m2/TVP5147/TVP5147m1 device is high quality,
>> >> +single-chip digital video decoder that digitizes and decodes all popular
>> >> +baseband analog video formats into digital video component. The tvp514x
>> >> +decoder supports analog-to-digital (A/D) conversion of component RGB and
>> >> +YPbPr signals as well as A/D conversion and decoding of NTSC, PAL and
>> >> +SECAM composite and S-video into component YCbCr.
>> >> +
>> >> +Required Properties :
>> >> +- compatible: Must be "ti,tvp514x-decoder"
>> >
>> > There are no significant differences among TVP514* devices as listed
>> > above, you would like to handle above ?
>> >
>> > I'm just wondering if you don't need, for instance, two separate
>> > compatible properties, e.g. "ti,tvp5146-decoder" and "ti,tvp5147-decoder"
>> > ?
>>
>> There are few differences in init/power sequence tough, I would still
>> like to have single compatible property "ti,tvp514x-decoder", If you feel we
>> need separate property I will change it please let me know on this.
>
> If there's any difference between the chips that need to be handled in the
> driver, using two compatible properties is a good practice. Your driver will
> then be able to easily differentiate between the two chips, and there's no
> real drawback in doing so.
>
Ok I'll will have separate compatible properties.

Regards,
--Prabhakar

> --
> Regards,
>
> Laurent Pinchart
>
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