Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver

Viresh Kumar
2021-06-29T11:16:51Z

On 29-06-21, 13:11, Wolfram Sang wrote:
>
> > The case when ``length of \field{write_buf}''=0, and at the same time,
> > ``length of \field{read_buf}''=0 is called not-a-read-write request
> > and result for such a request is I2C device specific.
>
> Obviously, I don't know much about the specs and their wording. Still I
> wonder if we can't call it a zero length transfer?

Maybe that.

> This is allowed by
> the I2C standard and SMBus has even a proper name for it (SMBUS_QUICK).
> From my point of view, I would not say it is device specific because
> devices are expected to ACK such a message.

Actually we should skip the last line from my diff, i.e. completely
drop "and result for such a request is I2C device specific".

The device (host in virtio spec terminology) still needs to return
success/failure as it does for other requests. Nothing special here.

--
viresh