linux-kernel - Re: [PATCH v1 2/3] Documentation: gpio: Add a section on what to return in ->get() callback

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Message-ID: <CACRpkdaQWZE6=BNEh5hSH9=jBK=TcLoD1uUb=JyNYmHFvaSAfg@mail.gmail.com>
Date:   Sat, 3 Dec 2022 10:38:45 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kent Gibson <warthog618@...il.com>
Cc:     Marc Zyngier <maz@...nel.org>, linux-gpio@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Corbet <corbet@....net>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v1 2/3] Documentation: gpio: Add a section on what to
 return in ->get() callback

On Wed, Nov 30, 2022 at 4:55 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:

> +The below table gathered the most used cases.
> +
> +==========  ==========  ===============  =======================
> +  Input       Output         State        What value to return?
> +==========  ==========  ===============  =======================
> + Disabled    Disabled    Hi-Z             input buffer
> + Disabled    OS/OD/etc   Single ended     [cached] output buffer
> +    x        Push-Pull   Out              [cached] output buffer
> + Enabled     Disabled    In               input buffer
> + Enabled     OS/OD/etc   Bidirectional    input buffer
> +==========  ==========  ===============  =======================

This looks about right to me, but we need more input, Kent?

Yours,
Linus Walleij