linux-kernel - Re: [PATCH v2 4/4] [media] ad5820: Add support for of-autoload

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Date:   Thu, 20 Sep 2018 23:10:23 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     Pavel Machek <pavel@....cz>, Sakari Ailus <sakari.ailus@....fi>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [PATCH v2 4/4] [media] ad5820: Add support for of-autoload

Hi Ricardo,

Thank you for the patch.

On Thursday, 20 September 2018 21:31:51 EEST Ricardo Ribalda Delgado wrote:
> Since kernel 4.16, i2c devices with DT compatible tag are modprobed
> using their DT modalias.
> Without this patch, if this driver is build as module it would never
> be autoprobed.
> 
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
> ---
>  drivers/media/i2c/ad5820.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/media/i2c/ad5820.c b/drivers/media/i2c/ad5820.c
> index 20931217e3b1..75b9b8aa5533 100644
> --- a/drivers/media/i2c/ad5820.c
> +++ b/drivers/media/i2c/ad5820.c
> @@ -375,12 +375,19 @@ static const struct i2c_device_id ad5820_id_table[] =
> { };
>  MODULE_DEVICE_TABLE(i2c, ad5820_id_table);
> 
> +static const struct of_device_id ad5820_of_table[] = {
> +	{ .compatible = "adi,"AD5820_NAME },

I'd spell this out explicitly, to make it easier to grep for the compatible 
string.

> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, ad5820_of_table);
> +
>  static SIMPLE_DEV_PM_OPS(ad5820_pm, ad5820_suspend, ad5820_resume);
> 
>  static struct i2c_driver ad5820_i2c_driver = {
>  	.driver		= {
>  		.name	= AD5820_NAME,
>  		.pm	= &ad5820_pm,
> +		.of_match_table = ad5820_of_table,

As the driver doesn't depend on CONFIG_OF, would it make sense to use 
of_config_ptr() (and to compile the of table conditionally on CONFIG_OF) ?

>  	},
>  	.probe		= ad5820_probe,
>  	.remove		= ad5820_remove,

-- 
Regards,

Laurent Pinchart