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Subject: Re: [PATCH v4] i2c: virtio: add a virtio i2c frontend driver
To:     "Michael S. Tsirkin" <mst@redhat.com>
Cc:     linux-i2c@vger.kernel.org,
        virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, jasowang@redhat.com,
        wsa+renesas@sang-engineering.com, wsa@kernel.org,
        andriy.shevchenko@linux.intel.com, jarkko.nikula@linux.intel.com,
        jdelvare@suse.de, Sergey.Semin@baikalelectronics.ru,
        krzk@kernel.org, rppt@kernel.org, loic.poulain@linaro.org,
        tali.perry1@gmail.com, bjorn.andersson@linaro.org,
        shuo.a.liu@intel.com, conghui.chen@intel.com, yu1.wang@intel.com
References: <7c5e44c534b3fd07b855af22d8d4b78bc44cd7a4.1602465440.git.jie.deng@intel.com>
 <20201125043422-mutt-send-email-mst@kernel.org>
From:   Jie Deng <jie.deng@intel.com>
Message-ID: <6cbea83e-04fa-8d5a-bba7-d80afabe8a5d@intel.com>
Date:   Thu, 26 Nov 2020 10:00:18 +0800
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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@intel.com>
>> Signed-off-by: Conghui Chen <conghui.chen@intel.com>
>> Signed-off-by: Jie Deng <jie.deng@intel.com>
>> Reviewed-by: Shuo Liu <shuo.a.liu@intel.com>
>> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.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.