iio: proximity: as3935: recalibrate RCO after resume
According to the datasheet the RCO must be recalibrated on every power-on-reset. Also remove mutex locking in the calibration function since callers other than the probe function (which doesn't need it) will have a lock. Fixes: 24ddb0e4 ("iio: Add AS3935 lightning sensor support") Cc: George McCollister <george.mccollister@gmail.com> Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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