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

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Message-Id: <201305031634.39129.arnd@arndb.de>
Date:	Fri, 3 May 2013 16:34:38 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
Cc:	LMML <linux-media@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.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>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	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

On Friday 03 May 2013, Prabhakar Lad wrote:
> 
> +static struct mt9p031_platform_data *
> +mt9p031_get_pdata(struct i2c_client *client)
> +{
> +       struct device_node *np;
> +       struct mt9p031_platform_data *pdata;
> +
> +       if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
> +               return client->dev.platform_data;
> +
> +       np = v4l2_of_get_next_endpoint(client->dev.of_node, NULL);
> +       if (!np)
> +               return NULL;
> +
> +       pdata = devm_kzalloc(&client->dev, sizeof(struct mt9p031_platform_data),
> +                            GFP_KERNEL);
> +       if (!pdata)
> +               return NULL;
> +
> +       pdata->reset = of_get_named_gpio(client->dev.of_node, "gpio-reset", 0);
> +       of_property_read_u32(np, "input-clock-frequency", &pdata->ext_freq);
> +       of_property_read_u32(np, "pixel-clock-frequency", &pdata->target_freq);
> +
> +       return pdata;
> +}

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.

	Arnd
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