iio: adc: ad7091r5: Add scale and external VREF support

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The scale can now be obtained with the "in_voltage_scale" file.
By default, the scale returned corresponds to the internal VREF of 2.5V.

It is possible to use an external VREF (through the REFIN/REFOUT pin of
the chip), by passing a regulator to the driver. The scale will then be
calculated according to the voltage reported by the regulator.

Signed-off-by: Paul Cercueil <paul.cercueil@analog.com>
Co-developed-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Paul Cercueil 2019-11-15 15:57:21 +02:00 • committed by Jonathan Cameron

parent ca69300173

commit 260442cc5b

3 changed files with 44 additions and 0 deletions

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38

drivers/iio/adc/ad7091r-base.c

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1

drivers/iio/adc/ad7091r-base.h

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5

drivers/iio/adc/ad7091r5.c

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