Re: [PATCH v1 3/7] iio: adc: ina2xx: Remove unneeded dummy read to clear CNVR flag

[Stefan Brüns]

On Sunday, December 10, 2017 6:27:33 PM CET Jonathan Cameron wrote:
> On Fri, 8 Dec 2017 18:41:48 +0100
> 
> Stefan Brüns <stefan.bruens@xxxxxxxxxxxxxx> wrote:
> > Although the datasheet states the CNVR flag is cleared by reading the
> > BUS_VOLTAGE register, it is actually cleared by reading any of the
> > voltage/current/power registers.
> > 
> > The behaviour has been confirmed by TI support:
> > http://e2e.ti.com/support/amplifiers/current-shunt-monitors/f/931/p/647053
> > /2378282
> > 
> > Signed-off-by: Stefan Brüns <stefan.bruens@xxxxxxxxxxxxxx>
> 
> I haven't checked the code thoroughly so there may well be something
> stopping it but have you checked the case where the only channel enabled is
> the timestamp?
> 
> Obviously it makes little sense, but IIRC there is nothing in the core
> preventing that happening.

The timestamp is completely unrelated to the status register, so I fail to 
understand your question. Can you please clarify?

This only removes a redundant read.

All channel combinations (w/ and w/o timestamp) work, but combinations not 
including the power register use less bus time now.

Kind regards,

Stefan

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