iio: adc: meson-saradc: add calibration

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This patch adds calibration for the Meson SAR ADC.
Points 25% vref and 75% vref are used for calibration.
It uses a simple linear calibration function: SCALE * val + BIAS

Successfully tested on a Odroid C2.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

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Heiner Kallweit 2017-03-18 19:38:19 +01:00 • committed by Jonathan Cameron

parent 66893ea375

commit 48ba7c3c0b

1 changed files with 75 additions and 2 deletions

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drivers/iio/adc/meson_saradc.c

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