Messages in this thread | | | Date | Tue, 29 Jun 2021 16:46:30 +0530 | From | Viresh Kumar <> | Subject | Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver |
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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
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