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[0/2] iio: adc: axp20x: add support for NTC thermistor

Message ID 20211118141233.247907-1-boger@wirenboard.com (mailing list archive)
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Series iio: adc: axp20x: add support for NTC thermistor | expand

Message

Evgeny Boger Nov. 18, 2021, 2:12 p.m. UTC 
Most AXPxxx-based reference designs place a 10k NTC thermistor on a
TS pin. When appropriately configured, AXP PMICs will inject fixed
current (80uA by default) into TS pin and measure the voltage across a
thermistor. The PMIC itself will by default compare this voltage with
predefined thresholds  and disable battery charging whenever
the battery is too hot or too cold.

Alternatively, the TS pin can be configured as general-purpose
ADC input. This mode is not supported by the driver.
    
This patch series allows reading the voltage on the TS pin. The voltage
can be then either processed by userspace or used by kernel consumer like
hwmon ntc thermistor driver.


Evgeny Boger (2):
  iio:adc:axp20x: add support for NTC thermistor
  dt-bindings: iio: adc: document TS voltage in AXP PMICs

 .../bindings/iio/adc/x-powers,axp209-adc.yaml |  3 ++
 drivers/iio/adc/axp20x_adc.c                  | 45 ++++++++++++++++---
 2 files changed, 42 insertions(+), 6 deletions(-)