tree 0599c4cf93b33d2bfb199006117b9bfb056dc22d
parent ff4a98e3bcb3756544b31a2610a24db77f5a20b4
author Akinobu Mita <akinobu.mita@gmail.com> 1500564262 +0900
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1504971578 +0200

iio: adc: ti-ads1015: add adequate wait time to get correct conversion

commit 4744d4e2afebf9644a439da9ca73d822fdd67bd9 upstream.

This driver assumes that the device is operating in the continuous
conversion mode which performs the conversion continuously.  So this driver
inserts a wait time before reading the conversion register if the
configuration is changed from a previous request.

Currently, the wait time is only the period required for a single
conversion that is calculated as the reciprocal of the sampling frequency.
However we also need to wait for the the previous conversion to complete.
Otherwise we probably get the conversion result for the previous
configuration when the sampling frequency is lower.

Cc: Daniel Baluta <daniel.baluta@gmail.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>