iio:adc:at91-sama5d2: add support for differential conversions

Add signed differential channels and update the voltage scale for
differential conversions.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Ludovic Desroches 2016-03-22 17:08:46 +01:00 • committed by Jonathan Cameron
commit d65113222c