iio: adc: ina2xx: Use a monotonic clock for delay calculation

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The iio timestamp clock is user selectable and may be non-monotonic. Also,
only part of the acquisition time is measured, thus the delay was longer
than intended.

Use a monotonic timestamp to track the time for the next poll iteration.
The timestamp is advanced by the sampling interval each iteration. In case
the conversion overrruns the register readout (i.e. fast sampling combined
with a slow bus), one or multiple samples will be dropped.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Stefan Brüns 2018-01-01 02:24:42 +01:00 • committed by Greg Kroah-Hartman

parent 08e2e51f9a

commit 8ea2a63869

1 changed files with 27 additions and 14 deletions

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drivers/iio/adc/ina2xx-adc.c

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