linux-kernel - Re: [PATCH v2] iio: proximity: vl53l0x-i2c add i2c_device

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Date:   Sun, 18 Oct 2020 12:33:34 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Vaishnav M A <vaishnav@...gleboard.org>
Cc:     songqiang1304521@...il.com, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, jkridner@...gleboard.org,
        drew@...gleboard.org, robertcnelson@...gleboard.org,
        rajkovic@...roe.com, Wolfram Sang <wsa@...nel.org>
Subject: Re: [PATCH v2] iio: proximity: vl53l0x-i2c add i2c_device_id

On Sun, 18 Oct 2020 09:01:42 +0530
Vaishnav M A <vaishnav@...gleboard.org> wrote:

> add i2c_device_id for the vl53l0x-i2c driver so
> that the device can be instantiated using i2c_new_client_device
> or from userspace, useful in cases where device tree based description
> is not possible now(Eg. a device on a gbphy i2c
> adapter created by greybus).
> 
> Signed-off-by: Vaishnav M A <vaishnav@...gleboard.org>

Please fix the description as mentioned in other patches.

The code change is fine, but it does raise the question of whether we want to think
about providing a means to register such devices using the of_match_table.
It's somewhat irritating to need to provide both (I'd rather not
just provide the non-dt version rely on the old hack that drops the
vendor ID for matching).

+CC Wolfram.

> ---
>  v2:
> 	- fix commit message
>  drivers/iio/proximity/vl53l0x-i2c.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c
> index 5fbda9475ba9..7c29d4cae24a 100644
> --- a/drivers/iio/proximity/vl53l0x-i2c.c
> +++ b/drivers/iio/proximity/vl53l0x-i2c.c
> @@ -143,6 +143,12 @@ static int vl53l0x_probe(struct i2c_client *client)
>  	return devm_iio_device_register(&client->dev, indio_dev);
>  }
>  
> +static const struct i2c_device_id vl53l0x_id[] = {
> +	{ "vl53l0x", 0},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, vl53l0x_id);
> +
>  static const struct of_device_id st_vl53l0x_dt_match[] = {
>  	{ .compatible = "st,vl53l0x", },
>  	{ }
> @@ -155,6 +161,7 @@ static struct i2c_driver vl53l0x_driver = {
>  		.of_match_table = st_vl53l0x_dt_match,
>  	},
>  	.probe_new = vl53l0x_probe,
> +	.id_table = vl53l0x_id,
>  };
>  module_i2c_driver(vl53l0x_driver);
>