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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Wed, 21 Jul 2021 18:50:59 +0300
Message-ID: <CAHp75VeWSfBek+m6hQoc6G7wP+JNN-V3S0kfcGBESZLR+6QAxg@mail.gmail.com>
Subject: Re: [PATCH] iio: accel: fxls8962af: fix i2c dependency
To:     Arnd Bergmann <arnd@kernel.org>
Cc:     Jonathan Cameron <jic23@kernel.org>,
        Sean Nyekjaer <sean@geanix.com>, Arnd Bergmann <arnd@arndb.de>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Linus Walleij <linus.walleij@linaro.org>,
        Stephan Gerhold <stephan@gerhold.net>,
        Hans de Goede <hdegoede@redhat.com>,
        Tomas Melin <tomas.melin@vaisala.com>,
        Mike Looijmans <mike.looijmans@topic.nl>,
        Alexandru Ardelean <aardelean@deviqon.com>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
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On Wed, Jul 21, 2021 at 6:13 PM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> With CONFIG_SPI=y and CONFIG_I2C=m, building fxls8962af into vmlinux
> causes a link error against the I2C module:
>
> aarch64-linux-ld: drivers/iio/accel/fxls8962af-core.o: in function `fxls8962af_fifo_flush':
> fxls8962af-core.c:(.text+0x3a0): undefined reference to `i2c_verify_client'
>
> Work around it by adding a Kconfig dependency that forces the SPI driver
> to be a loadable module whenever I2C is a module.

...

>  config FXLS8962AF
>         tristate
> +       depends on I2C || !I2C # cannot be built-in for modular I2C

Can you enlighten me how this will not be a no-op?

-- 
With Best Regards,
Andy Shevchenko