linux-kernel - Re: [PATCH V3 1/3] gpio: Add virtio-gpio driver

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Message-ID: <8d58da79-8e54-048b-db89-8c1caaa0320f@metux.net>
Date:   Wed, 16 Jun 2021 17:52:22 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        Viresh Kumar <vireshk@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Bill Mills <bill.mills@...aro.org>,
        Alex Benn?e <alex.bennee@...aro.org>,
        stratos-dev@...lists.linaro.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Stefano Garzarella --cc virtualization @ lists . linux-foundation . org" 
        <sgarzare@...hat.com>, virtualization@...ts.linux-foundation.org,
        Alistair Strachan <astrachan@...gle.com>
Subject: Re: [PATCH V3 1/3] gpio: Add virtio-gpio driver

On 16.06.21 05:30, Bjorn Andersson wrote:

> Combined with the virtio-i2c effort this could provide an alternative by
> simply tunneling the busses and GPIOs into Linux and use standard iio
> drivers, for cases where this suits your product requirements better.

So, you wanna use virtio as logical interface between the two CPUs ?
Interesting idea. Usually folks use rpmsg for those things.

What is running on the secondary CPU ? Some OS like Linux or some bare
metal stuff ? What kind of CPU is that anyways ?

--mtx

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