linux-kernel - Re: [PATCH 16/34] iio: ad5755: hook up of_device

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Date: Wed, 3 Apr 2024 11:55:06 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
 Lars-Peter Clausen <lars@...afoo.de>,
 Michael Hennerich <Michael.Hennerich@...log.com>,
 Jonathan Cameron <jic23@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, linux-iio@...r.kernel.org
Subject: Re: [PATCH 16/34] iio: ad5755: hook up of_device_id lookup to
 platform driver

On 03/04/2024 10:06, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When the driver is built-in, 'make W=1' warns about an unused
> ID table:
> 
> drivers/iio/dac/ad5755.c:866:34: error: 'ad5755_of_match' defined but not used [-Werror=unused-const-variable=]
>   866 | static const struct of_device_id ad5755_of_match[] = {
> 
> While the data is duplicated in the spi_device_id, it's common
> to use the actual OF compatible strings in the driver.
> 
> Since there are no in-tree users of plain platform devices, the
> spi_device_id table could actually be dropped entirely with this.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/iio/dac/ad5755.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iio/dac/ad5755.c b/drivers/iio/dac/ad5755.c
> index 404865e35460..5c1e7f428c25 100644
> --- a/drivers/iio/dac/ad5755.c
> +++ b/drivers/iio/dac/ad5755.c
> @@ -876,6 +876,7 @@ MODULE_DEVICE_TABLE(of, ad5755_of_match);
>  static struct spi_driver ad5755_driver = {
>  	.driver = {
>  		.name = "ad5755",
> +		.of_match_table = ad5755_of_match,

I was working on this as well and have a bit bigger solution, following
Jonathan's preference (I think):

https://lore.kernel.org/all/20240226192555.14aa178e@jic23-huawei/

I need to send v3, somehow I missed his comments.

Jonathan,
Do you want me to still work on this according to your comments (which I
missed, I am sorry).

Best regards,
Krzysztof