netdev - Re: [PATCH v3 03/24] wfx: add Makefile/Kconfig

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Date:   Wed, 23 Dec 2020 07:16:06 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Jérôme Pouiller <jerome.pouiller@...abs.com>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        linux-mmc@...r.kernel.org,
        Pali Rohár <pali@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v3 03/24] wfx: add Makefile/Kconfig

Jérôme Pouiller <jerome.pouiller@...abs.com> writes:

> On Tuesday 22 December 2020 16:02:38 CET Kalle Valo wrote:
>> Jerome Pouiller <Jerome.Pouiller@...abs.com> writes:
>> 
>> > From: Jérôme Pouiller <jerome.pouiller@...abs.com>
>> >
>> > Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
>> 
>> [...]
>> 
>> > +wfx-$(CONFIG_SPI) += bus_spi.o
>> > +wfx-$(subst m,y,$(CONFIG_MMC)) += bus_sdio.o
>> 
>> Why this subst? And why only for MMC?
>
> CONFIG_SPI is a boolean (y or empty). The both values make senses.
>
> CONFIG_MMC is a tristate (y, m or empty). The substitution above
> ensure that bus_sdio.o will included in wfx.ko if CONFIG_MMC is 'm'
> ("wfx-$(CONFIG_MMC) += bus_sdio.o" wouldn't make the job).
>
> You may want to know what it happens if CONFIG_MMC=m while CONFIG_WFX=y.
> This line in Kconfig prevents to compile wfx statically if MMC is a
> module:
>        depends on MMC || !MMC # do not allow WFX=y if MMC=m

Ok, thanks for explaining this.

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