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

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Message-ID: <CA+V-a8tXZrh68_T=VAOTB23sFfOCOA+GafueWuH6cFFmKz7cvA@mail.gmail.com>
Date:	Tue, 7 May 2013 15:10:36 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	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 Arnd,

On Mon, May 6, 2013 at 8:29 PM, Prabhakar Lad
<prabhakar.csengg@...il.com> wrote:
> Hi Arnd,
>
> 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 :-)

Regards,
--Prabhakar Lad
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