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diff --git a/Documentation/hwmon/wm831x.rst b/Documentation/hwmon/wm831x.rst new file mode 100644 index 000000000000..c56fb35a2fb3 --- /dev/null +++ b/Documentation/hwmon/wm831x.rst @@ -0,0 +1,40 @@ +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. |