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Subject: Re: [PATCH v5 2/2] gpio: gpio-cascade: add generic GPIO cascade
To:     Andy Shevchenko <andy.shevchenko@gmail.com>,
        Mauri Sandberg <maukka@ext.kapsi.fi>
Cc:     Mauri Sandberg <sandberg@mailfence.com>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Linus Walleij <linus.walleij@linaro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Drew Fustini <drew@beagleboard.org>
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From:   "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Message-ID: <8d28463e-7a67-229a-6934-e3a59a8ab330@metux.net>
Date:   Mon, 21 Jun 2021 20:31:44 +0200
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On 21.06.21 19:43, Andy Shevchenko wrote:

> Since in parallel there is a discussion about the virtio-gpio
> interface, how will this work with it?

Haven't really understood what this is actually doing. A multiplexer
where only external line is connected to some actual gpio at a time ?
Or does it merge multiple inputs into one (eg. logical OR) ?

Is that about real hardware mux chips or just a software only ?

What is the actual use case ?

For now, I don't see any relation to virtio-gpio. Correct me if I'm
wrong.


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@metux.net -- +49-151-27565287