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

On 2020/10/8 22:01, Wolfram Sang wrote:

Hi,

some super high level questions:

quoted

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?

Sure. Here is the link.
https://raw.githubusercontent.com/projectacrn/acrn-hypervisor/master/devicemodel/hw/pci/virtio/virtio_i2c.c

quoted

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?

That's what I want to know also.
So hi Michael, what's the upstream flow for this patch ?

Thanks.

quoted

+	  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

Yes, you can configure what devices can be seen by the guest.
This provides a way to flexibly organize and manage I2C slave devices 
from the guest.

We tested it on Intel APL MRB. There are some docs for you reference.
https://projectacrn.github.io/latest/developer-guides/hld/virtio-i2c.html?highlight=i2c

Regards.

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