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Date:   Tue, 5 Mar 2019 17:46:17 +0100
From:   Arnd Bergmann <>
To:     "Enrico Weigelt, metux IT consult" <>
Cc:     Darren Hart <>,
        Andy Shevchenko <>,
        Linus Walleij <>,
        Enrico Weigelt <>,
        Andy Shevchenko <>,
        "open list:GPIO SUBSYSTEM" <>,
        Platform Driver <>,
        Linux Kernel Mailing List <>,
        Masahiro Yamada <>,
        Linux Kbuild mailing list <>
Subject: Re: [PATCH 2/3] x86: apuv2: fix input dependencies

On Tue, Mar 5, 2019 at 2:50 PM Enrico Weigelt, metux IT consult
<> wrote:
> On 05.03.19 09:23, Arnd Bergmann wrote:
> hmm, if circular deps happen, wouldn't that mean we've got some deeper
> problems in here ? IMHO, dependencies should always form a DAG (except
> for some really rare cases).
> Do you recall any actual problem w/ input vs gpio vs. drivers ?
> I'd like to have a closer look at it.

Not with gpio. Most of the circular dependencies I've seen tend to
revolve around drivers/gpu/drm, which uses more 'select' statements
than most other subsystems. Those dependencies often touch
backlight, acpi, fbdev and other things then.


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