linux-kernel - Re: [PATCH -next 1/2] ASoC: max98396: Fix build error for implicit function declaration

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Date:   Wed, 11 May 2022 13:06:05 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Hui Tang <tanghui20@...wei.com>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        ryan.lee.analog@...il.com, ricardw@...s.com, steve@....org,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next 1/2] ASoC: max98396: Fix build error for implicit
 function declaration

On Wed, May 11, 2022 at 09:23:47AM +0800, Hui Tang wrote:

>                          devm_regulator_get_optional
> sound/soc/codecs/max98396.c:1556:23: error: ‘GPIOD_OUT_HIGH’ undeclared (first use in this function); did you mean ‘GPIOF_INIT_HIGH’?
>               "reset", GPIOD_OUT_HIGH);
>                        ^~~~~~~~~~~~~~
>                        GPIOF_INIT_HIGH
> sound/soc/codecs/max98396.c:1556:23: note: each undeclared identifier is reported only once for each function it appears in
> sound/soc/codecs/max98396.c:1565:3: error: implicit declaration of function ‘gpiod_set_value_cansleep’; did you mean ‘gpio_set_value_cansleep’? [-Werror=implicit-function-declaration]
>    gpiod_set_value_cansleep(max98396->reset_gpio, 0);
>    ^~~~~~~~~~~~~~~~~~~~~~~~
>    gpio_set_value_cansleep
> cc1: all warnings being treated as errors
> 
> Add depend on GPIOLIB for 'config SND_SOC_MAX98396'

No, these issues are missing headers not dependencies.  In general
gpiolib stubs out so drivers can optionally use GPIO functionality.

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