linux-kernel - Re: [PATCH v2 2/2] iio: adc: ep93xx: Add OF support

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Message-ID: <20221223162024.46636cce@jic23-huawei>
Date:   Fri, 23 Dec 2022 16:20:24 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexander Sverdlin <alexander.sverdlin@...il.com>
Cc:     linux-iio@...r.kernel.org,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] iio: adc: ep93xx: Add OF support

On Mon, 19 Dec 2022 18:36:18 +0100
Alexander Sverdlin <alexander.sverdlin@...il.com> wrote:

> Prepare for EP93xx conversion to DT.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
Hi Alexander,

Comments inline,

Jonathan

> ---
>  drivers/iio/adc/ep93xx_adc.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/iio/adc/ep93xx_adc.c b/drivers/iio/adc/ep93xx_adc.c
> index fd5a9404c8dc..e530a37180e1 100644
> --- a/drivers/iio/adc/ep93xx_adc.c
> +++ b/drivers/iio/adc/ep93xx_adc.c
> @@ -21,6 +21,7 @@
>  #include <linux/module.h>
>  #include <linux/mutex.h>
>  #include <linux/platform_device.h>
> +#include <linux/of.h>
>  
>  /*
>   * This code could benefit from real HR Timers, but jiffy granularity would
> @@ -227,9 +228,18 @@ static int ep93xx_adc_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_OF
> +static const struct of_device_id ep93xx_adc_of_ids[] = {
> +	{ .compatible = "cirrus,ep9301-adc" },
> +	{},

No comma needed for 'NULL' terminator of the array.

> +};
> +MODULE_DEVICE_TABLE(of, ep93xx_adc_of_ids);
> +#endif
> +
>  static struct platform_driver ep93xx_adc_driver = {
>  	.driver = {
>  		.name = "ep93xx-adc",
> +		.of_match_table = of_match_ptr(ep93xx_adc_of_ids),
drop the of_match_ptr() protection and the ifdefs.
They only save a tiny amount of space, and add complexity that outweighs it.
The other normal reason we don't like these is that there are ACPI paths
that use of_match_table and this breaks them.  Not likely to be relevant
here though I guess.

Jonathan




>  	},
>  	.probe = ep93xx_adc_probe,
>  	.remove = ep93xx_adc_remove,