swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
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Tip revision: d012a7190fc1fd72ed48911e77ca97ba4521bccd authored by Linus Torvalds on 23 August 2020, 21:08:43 UTC
Linux 5.9-rc2
Linux 5.9-rc2
Tip revision: d012a71
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.