Messages in this thread | | | Date | Tue, 29 Jun 2021 16:26:49 +0530 | From | Viresh Kumar <> | Subject | Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver |
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On 29-06-21, 12:43, Wolfram Sang wrote: > > > 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: > > > + 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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