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Tip revision: def9d2780727cec3313ed3522d0123158d87224d authored by Linus Torvalds on 20 January 2020, 00:02:49 UTC
Linux 5.5-rc7
Linux 5.5-rc7
Tip revision: def9d27
wm831x.rst
Kernel driver wm831x-hwmon
==========================
Supported chips:
* Wolfson Microelectronics WM831x PMICs
Prefix: 'wm831x'
Datasheet:
- http://www.wolfsonmicro.com/products/WM8310
- http://www.wolfsonmicro.com/products/WM8311
- http://www.wolfsonmicro.com/products/WM8312
Authors: Mark Brown <broonie@opensource.wolfsonmicro.com>
Description
-----------
The WM831x series of PMICs include an AUXADC which can be used to
monitor a range of system operating parameters, including the voltages
of the major supplies within the system. Currently the driver provides
reporting of all the input values but does not provide any alarms.
Voltage Monitoring
------------------
Voltages are sampled by a 12 bit ADC. Voltages in millivolts are 1.465
times the ADC value.
Temperature Monitoring
----------------------
Temperatures are sampled by a 12 bit ADC. Chip and battery temperatures
are available. The chip temperature is calculated as:
Degrees celsius = (512.18 - data) / 1.0983
while the battery temperature calculation will depend on the NTC
thermistor component.