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

On 29-06-21, 12:43, Wolfram Sang wrote:

quoted

From the spec:

The case when ``length of \field{write_buf}''=0, and at the same time,
``length of \field{read_buf}''=0 doesn't make any sense.

I mentioned this in my first reply and to my understanding I did not get
a reply that this has changed meanwhile.

Also, this code as mentioned before:

quoted

+             if (!msgs[i].len)
+                     break;

I hope this can extended in the future to allow zero-length messages. If
this is impossible we need to set an adapter quirk instead.

Ahh, yeah I saw these messages but I wasn't able to relate them to the
I2C_FUNC_SMBUS_QUICK thing. My bad.

Looked at Spec, Linux driver and my backends, I don't there is
anything that breaks if we allow this. So the best thing (looking
ahead) is if Jie sends a patch for spec to be modified like this.

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.

-- 
viresh
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