linux-kernel - Re: [PATCH v1 1/3] Documentation: gpio: Input mode is not true Hi-Z

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Message-ID: <CACRpkdYVU2KJMw=FRxCLXbpWY+42RGheHvnqzg2bo2=JjTRCOw@mail.gmail.com>
Date:   Sat, 3 Dec 2022 10:33:50 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.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 1/3] Documentation: gpio: Input mode is not true Hi-Z

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

> The true Hi-Z (a.k.a. high impedance) mode is when pin is completely
> disconnected from the chip. This includes input buffer as well.
> Nevertheless, some hardware may not support that mode and they are
> considering input only as Hi-Z, but more precisely it is an equivalent
> to that, in electronics it's basically "an antenna mode".
>
> Sligthly correct documentation to take the above into consideration.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij