iio: adc: stm32-adc: add vrefint calibration support

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Add support of vrefint calibration.
If a channel is labeled as vrefint, get vrefint calibration
from non volatile memory for this channel.
vrefint channel is exposed as a processed channel returning
the actual value of vrefp:
vrefp = 3.3 x vrefint_cal / vrefint_data

A conversion on vrefint channel allows to update scale
factor according to vrefint deviation, compared to vrefint
calibration value.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20211014131228.4692-7-olivier.moysan@foss.st.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Olivier Moysan 2021-10-14 15:12:27 +02:00 • committed by Jonathan Cameron

parent aec6e0d8f0

commit 0e346b2cfa

1 changed files with 68 additions and 6 deletions

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drivers/iio/adc/stm32-adc.c

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