linux-kernel - Re: [PATCH v4] i2c: virtio: add a virtio i2c frontend driver

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Message-ID: <6cbea83e-04fa-8d5a-bba7-d80afabe8a5d@intel.com>
Date:   Thu, 26 Nov 2020 10:00:18 +0800
From:   Jie Deng <jie.deng@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-i2c@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, jasowang@...hat.com,
        wsa+renesas@...g-engineering.com, wsa@...nel.org,
        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 v4] i2c: virtio: add a virtio i2c frontend driver

On 2020/11/25 17:35, Michael S. Tsirkin wrote:

> On Mon, Oct 12, 2020 at 09:55:55AM +0800, Jie Deng wrote:
>> Add an I2C bus driver for virtio para-virtualization.
>>
>> The controller can be emulated by the backend driver in
>> any device model software by following the virtio protocol.
>>
>> This driver communicates with the backend driver through a
>> virtio I2C message structure which includes following parts:
>>
>> - Header: i2c_msg addr, flags, len.
>> - Data buffer: the pointer to the I2C msg data.
>> - Status: the processing result from the backend.
>>
>> People may implement different backend drivers to emulate
>> 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.
>>
>> The virtio device ID 34 is used for this I2C adpter since IDs
>> before 34 have been reserved by other virtio devices.
>>
>> Co-developed-by: Conghui Chen <conghui.chen@...el.com>
>> Signed-off-by: Conghui Chen <conghui.chen@...el.com>
>> Signed-off-by: Jie Deng <jie.deng@...el.com>
>> Reviewed-by: Shuo Liu <shuo.a.liu@...el.com>
>> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> I assume this will be updated once the specification is acked
> by the virtio tc. Holding off on this one for now since
> we know there will be host/guest ABI changes.

Yeah. I will update this driver once the specification is acked by the 
virtio tc.

Thanks.