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

From: Arnd Bergmann
Date: Thu Mar 18 2021 - 10:53:45 EST

On Thu, Mar 18, 2021 at 3:42 PM Enrico Weigelt, metux IT consult
<lkml@xxxxxxxxx> wrote:
> 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.

Allowing multiple virtio-i2c controllers in one system, and multiple i2c
devices attached to each controller is clearly something that has to work.

I don't actually see a limitation though. Viresh, what is the problem
you see for having multiple controllers?