linux-kernel - Re: [PATCH v5 2/2] gpio: gpio-cascade: add generic GPIO cascade

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

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@...ux.net -- +49-151-27565287