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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Prabhakar Lad <prabhakar.csengg@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Sascha Hauer <s.hauer@pengutronix.de>,
        LMML <linux-media@vger.kernel.org>,
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Subject: Re: [PATCH RFC v3] media: i2c: mt9p031: add OF support
Date: Wed, 08 May 2013 04:02:12 +0200
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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@arndb.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).

-- 
Regards,

Laurent Pinchart