linux-kernel - Re: [PATCH v4 4/7] [media] ad5820: Add support for of-autoload

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Date:   Thu, 27 Sep 2018 22:29:13 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     Pavel Machek <pavel@....cz>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v4 4/7] [media] ad5820: Add support for of-autoload

Hi Ricardo,

On Thu, Sep 20, 2018 at 10:47:48PM +0200, 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>
> Acked-by: Pavel Machek <pavel@....cz>
> ---
>  drivers/media/i2c/ad5820.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/media/i2c/ad5820.c b/drivers/media/i2c/ad5820.c
> index 625867472929..e461d36201a4 100644
> --- a/drivers/media/i2c/ad5820.c
> +++ b/drivers/media/i2c/ad5820.c
> @@ -372,12 +372,21 @@ static const struct i2c_device_id ad5820_id_table[] = {
>  };
>  MODULE_DEVICE_TABLE(i2c, ad5820_id_table);
>  
> +#ifdef CONFIG_OF
> +static const struct of_device_id ad5820_of_table[] = {
> +	{ .compatible = "adi,ad5820" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, ad5820_of_table);
> +#endif
> +
>  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 = of_match_ptr(ad5820_of_table),

No need to use of_match_ptr() or #ifdef above --- not doing so makes this
work on ACPI, too.

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

-- 
Regards,

Sakari Ailus
e-mail: sakari.ailus@....fi