linux-kernel - Re: [PATCH 2/2] iio: light: bh1750: Add device tree support

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Date:   Wed, 19 Sep 2018 21:22:39 +0200
From:   Tomasz Duszynski <tduszyns@...il.com>
To:     ryang <decatf@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] iio: light: bh1750: Add device tree support

Comments inline.

On Sat, Sep 15, 2018 at 01:42:14PM -0400, ryang wrote:
> Add device tree support for ROHM BH1750 series ambient light sensors.
>
> Signed-off-by: ryang <decatf@...il.com>
> ---
>  drivers/iio/light/bh1750.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/iio/light/bh1750.c b/drivers/iio/light/bh1750.c
> index a814828e69f5..50b599abb383 100644
> --- a/drivers/iio/light/bh1750.c
> +++ b/drivers/iio/light/bh1750.c
> @@ -315,9 +315,19 @@ static const struct i2c_device_id bh1750_id[] = {
>  };
>  MODULE_DEVICE_TABLE(i2c, bh1750_id);
>
> +static const struct of_device_id bh1750_of_match[] = {
> +	{ .compatible = "rohm,bh1710", },
> +	{ .compatible = "rohm,bh1715", },
> +	{ .compatible = "rohm,bh1721", },
> +	{ .compatible = "rohm,bh1750", },
> +	{ .compatible = "rohm,bh1751", },
> +	{ }
> +};
> +

Hmm, I believe this should be exported additionally using
MODULE_DEVICE_TABLE(of, bh1750_of_match). Otherwise module loading
will not work as expected.

Moreover, we can do without DT and if you want to avoid
warning about unused variables you may consider enclosing everything
with:

#ifdef CONFIG_OF
...
#endif

>  static struct i2c_driver bh1750_driver = {
>  	.driver = {
>  		.name = "bh1750",
> +		.of_match_table = of_match_ptr(bh1750_of_match),
>  		.pm = BH1750_PM_OPS,

I've recently simplified setting pm ops so this would not apply to
iio/togreg cleanly.

>  	},
>  	.probe = bh1750_probe,
> --
> 2.17.1
>