linux-kernel - Re: [PATCH RFC v3] media: i2c: mt9p031: add OF support

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Date:	Wed, 8 May 2013 10:19:57 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	LMML <linux-media@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	LKML <linux-kernel@...r.kernel.org>,
	Sakari Ailus <sakari.ailus@....fi>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	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
Subject: Re: [PATCH RFC v3] media: i2c: mt9p031: add OF support

Hi Laurent,

On Wed, May 8, 2013 at 7:32 AM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> Hi Prabhakar,
>
> On Tuesday 07 May 2013 15:10:36 Prabhakar Lad wrote:
>> On Mon, May 6, 2013 at 8:29 PM, Prabhakar Lad wrote:
>> > On Fri, May 3, 2013 at 8:04 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> >> On Friday 03 May 2013, Prabhakar Lad wrote:
>> > [snip]
>> >
>> >>> +}
>> >>
>> >> Ok, good.
>> >>
>> >>> @@ -955,7 +998,17 @@ static int mt9p031_probe(struct i2c_client *client,
>> >>>
>> >>>         mt9p031->pdata = pdata;
>> >>>         mt9p031->output_control = MT9P031_OUTPUT_CONTROL_DEF;
>> >>>         mt9p031->mode2 = MT9P031_READ_MODE_2_ROW_BLC;
>> >>>
>> >>> -       mt9p031->model = did->driver_data;
>> >>> +
>> >>> +       if (!client->dev.of_node) {
>> >>> +               mt9p031->model = (enum mt9p031_model)did->driver_data;
>> >>> +       } else {
>> >>> +               const struct of_device_id *of_id;
>> >>> +
>> >>> +               of_id = of_match_device(of_match_ptr(mt9p031_of_match),
>> >>> +                                       &client->dev);
>> >>> +               if (of_id)
>> >>> +                       mt9p031->model = (enum
>> >>> mt9p031_model)of_id->data;
>> >>> +       }
>> >>>
>> >>>         mt9p031->reset = -1;
>> >>
>> >> Is this actually required? I thought the i2c core just compared the
>> >> part of the "compatible" value after the first comma to the string, so
>> >> "mt9p031->model = (enum mt9p031_model)did->driver_data" should work
>> >> in both cases.
>> >
>> > I am OK with "mt9p031->model = (enum mt9p031_model)did->driver_data"
>> > but I see still few drivers doing this, I am not sure for what reason.
>> > If everyone is
>> > OK with it I can drop the above change.
>>
>> My bad, while booting with DT the i2c_device_id ie did in this case will be
>> NULL, so the above changes are required :-)
>
> I've just tested your patch, and did isn't NULL when booting my Beagleboard
> with DT (on v3.9-rc5).
>
I am pretty much sure you tested it compatible property as "aptina,mt9p031"
if the compatible property is set to "aptina,mt9p031m" the did will be NULL.

Regards,
--Prabhakar Lad
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