linux-kernel - Re: [PATCH 3/4] iio: light: max44009: add missing OF device matching

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Date:   Sat, 11 Mar 2023 13:28:17 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Robert Eshleman <bobbyeshleman@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] iio: light: max44009: add missing OF device matching

On 11/03/2023 13:26, Jonathan Cameron wrote:
> On Sat, 11 Mar 2023 12:14:56 +0100
> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> 
>> The driver currently matches only via i2c_device_id, but also has
>> of_device_id table:
>>
>>   drivers/iio/light/max44009.c:545:34: error: ‘max44009_of_match’ defined but not used [-Werror=unused-const-variable=]
>>
>> Fixes: 6aef699a7d7e ("iio: light: add driver for MAX44009")
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> Don't use of_match_ptr() unless you are absolutely sure no other firmware
> route will make use of the of_match_table.
> 
> In this particular case ACPI using PRP0001 is broken by that macro.

It's not broken because there was no matching via PRP0001 due to missing
table.

> 
> So good to set the of_match_table, but make sure to always set it
> and hence you don't need the __maybe_unused.

So you want to add PRP0001? We can, the fix is for different issue, though.

Best regards,
Krzysztof