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Generic Voltage Divided ADC Battery
=========================
In applications where a more sophisticated fuel gauge isn't available,
a simple voltage divider circuit and an external ADC can be used to get
the battery voltage.
R1 R2
+------/\/\/\------+------/\/\/\------+
| | |
Vbat Vadc GND
Required Properties:
-------------------
- compatible: "adc-div-battery"
- io-channels: The phandle + io-specifier pair of the ADC [1]
- divider-r1-ohm: The resistance of R1 in the divider circuit
- divider-r2-ohm: The resistance of R2 in the divider circuit
[1] See Documentation/devicetree/bindings/iio/iio-bindings.txt
Example:
battery {
compatible = "adc-div-battery";
io-channels = <&adc1 3>;
divider-r1-ohm = <100000>;
divider-r2-ohm = <301000>;
};