Refine offset and linear calibration strategy for STM32MP15 and STM32MP13 SoCs: - offset calibration This calibration depends on factors such as temperature and voltage. As it is not time consuming, it's worth doing it on each ADC start, to get the best accuracy. There is no need to save these data. - linear calibration This calibration is basically SoC dependent, so it can be done only once. When this calibration has been performed at boot stage, the ADC kernel driver can retrieve the calibration data from the ADC registers. Otherwise, the linear calibration is performed once by the ADC driver. The backup of these data, allows to restore them on successive ADC starts. Olivier Moysan (3): iio: adc: stm32-adc: smart calibration support iio: adc: stm32-adc: improve calibration error log iio: adc: stm32-adc: add debugfs to read raw calibration result drivers/iio/adc/stm32-adc-core.h | 1 + drivers/iio/adc/stm32-adc.c | 135 ++++++++++++++++++------------- 2 files changed, 78 insertions(+), 58 deletions(-) -- 2.25.1
