linux-kernel - Re: [PATCH v3] i2c: virtio: add a virtio i2c frontend driver

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Message-ID: <20201008140151.GE897@ninjato>
Date:   Thu, 8 Oct 2020 16:01:51 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     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, jasowang@...hat.com,
        andriy.shevchenko@...ux.intel.com, jarkko.nikula@...ux.intel.com,
        jdelvare@...e.de, Sergey.Semin@...kalelectronics.ru,
        krzk@...nel.org, rppt@...nel.org, loic.poulain@...aro.org,
        tali.perry1@...il.com, bjorn.andersson@...aro.org,
        shuo.a.liu@...el.com, conghui.chen@...el.com, yu1.wang@...el.com
Subject: Re: [PATCH v3] i2c: virtio: add a virtio i2c frontend driver

Hi,

some super high level questions:

> different controllers according to their needs. A backend
> example can be found in the device model of the open source
> project ACRN. For more information, please refer to
> https://projectacrn.org.

Could you provide a link directly to the backend, please?

> The device ID request:
>         https://github.com/oasis-tcs/virtio-spec/issues/85

Shall we wait for this to be approved? Or will it get only approved once
the driver here is upstream?

> +	  If you say yes to this option, support will be included for the virtio
> +	  I2C adapter driver. The hardware can be emulated by any device model
> +	  software according to the virtio protocol.

That means stuff like "limiting which devices on a given bus can be
accessed" will be handled by the backends, or?

What kind of testing has been done with this on which setup?

Thanks and happy hacking,

   Wolfram


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