linux-kernel - Re: [RFC PATCH V4 6/6] riscv: soc: Add Allwinner SoC kconfig option

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Message-ID: <CAJKOXPdH0C0CJe_oxZ2rG1UeE5G9w2mh2Thh8LynpNHQk2g1qA@mail.gmail.com>
Date:   Tue, 14 Sep 2021 12:07:08 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Guo Ren <guoren@...nel.org>, Randy Dunlap <rdunlap@...radead.org>,
        Maxime Ripard <maxime@...no.tech>,
        Anup Patel <anup.patel@....com>,
        Atish Patra <atish.patra@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Christoph Müllner <christoph.muellner@...ll.eu>,
        philipp.tomsich@...ll.eu, Christoph Hellwig <hch@....de>,
        liush <liush@...winnertech.com>, wefu@...hat.com,
        Wei Wu (吴伟) <lazyparser@...il.com>,
        Drew Fustini <drew@...gleboard.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        taiten.peng@...onical.com, aniket.ponkshe@...onical.com,
        heinrich.schuchardt@...onical.com, gordan.markus@...onical.com,
        Guo Ren <guoren@...ux.alibaba.com>,
        Chen-Yu Tsai <wens@...e.org>
Subject: Re: [RFC PATCH V4 6/6] riscv: soc: Add Allwinner SoC kconfig option

On Tue, 14 Sept 2021 at 11:31, Arnd Bergmann <arnd@...db.de> wrote:
> Some subsystem maintainers want drivers to be selected by the SoC
> option, this is why you need the 'select SIFIVE_PLIC', but usually
> the drivers are selectable with a 'depends on ARCH_SUNXI ||
> COMPILE_TEST' and enabled in the defconfig.

I would say selecting drivers is even more useful for distros and
other downstream users. Especially in the ARM world where we have so
many different SoCs - how could a distro person know which driver is
necessary, important or useful? Having all main SoC drivers enabled
when ARCH_SUNXI=y, helps distro a lot.

> If you want to get fancy, you can use something like:
>
> config RESET_SUNXI
>         bool "Allwinner SoCs Reset Driver" if COMPILE_TEST && !ARCH_SUNXI
>         default ARCH_SUNXI
>
> This will make an option that
>  - always enabled when the platform is built-in
>  - user selectable when compile-testing for any other platform
>  - always disabled otherwise

+1 for this pattern.

Best regards,
Krzysztof