linux-kernel - Re: [PATCH v8] i2c: virtio: add a virtio i2c frontend driver

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Message-ID: <0dfff1ac-50bb-b5bc-72ea-880fd52ed60d@metux.net>
Date:   Thu, 18 Mar 2021 15:40:30 +0100
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Jie Deng <jie.deng@...el.com>
Cc:     linux-i2c@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, mst@...hat.com, wsa@...nel.org,
        jasowang@...hat.com, wsa+renesas@...g-engineering.com,
        andriy.shevchenko@...ux.intel.com, conghui.chen@...el.com,
        arnd@...db.de, kblaiech@...lanox.com,
        jarkko.nikula@...ux.intel.com, Sergey.Semin@...kalelectronics.ru,
        rppt@...nel.org, loic.poulain@...aro.org, tali.perry1@...il.com,
        u.kleine-koenig@...gutronix.de, bjorn.andersson@...aro.org,
        yu1.wang@...el.com, shuo.a.liu@...el.com, stefanha@...hat.com,
        pbonzini@...hat.com
Subject: Re: [PATCH v8] i2c: virtio: add a virtio i2c frontend driver

On 16.03.21 08:44, Viresh Kumar wrote:

> FWIW, this limits this driver to support a single device ever. We
> can't bind multiple devices to this driver now. Yeah, perhaps we will
> never be required to do so, but who knows.

Actually, I believe multiple devices really should be possible.

The major benefit of virtio-i2c is either bridging certan real bus'es
into a confined workload, or creating virtual hw testbeds w/o having to
write a complete emulation (in this case, for dozens of different i2c
controllers) - and having multiple i2c interfaces in one machine isn't
exactly rare.


--mtx

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