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Date:   Mon, 25 Oct 2021 00:17:44 +0200
From:   Linus Walleij <>
To:     Mauri Sandberg <>
Cc:     Mauri Sandberg <>,
        Andy Shevchenko <>,
        Bartosz Golaszewski <>,
        Geert Uytterhoeven <>,
        "open list:GPIO SUBSYSTEM" <>,
        Rob Herring <>,
        linux-kernel <>,
        Drew Fustini <>
Subject: Re: [PATCH v7 2/2] gpio: gpio-cascade: add generic GPIO cascade

On Tue, Oct 19, 2021 at 10:10 PM Mauri Sandberg <> wrote:

> Adds support for building cascades of GPIO lines. That is, it allows
> setups when there is one upstream line and multiple cascaded lines, out
> of which one can be chosen at a time. The status of the upstream line
> can be conveyed to the selected cascaded line or, vice versa, the status
> of the cascaded line can be conveyed to the upstream line.
> A multiplexer is being used to select, which cascaded GPIO line is being
> used at any given time.
> At the moment only input direction is supported. In future it should be
> possible to add support for output direction, too.
> Signed-off-by: Mauri Sandberg <>
> ---
> v6 -> v7:

This v7 looks like clean and nice merge material to me,
Reviewed-by: Linus Walleij <>

Linus Walleij

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