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- Battery Characteristics
- The devicetree battery node provides static battery characteristics.
- In smart batteries, these are typically stored in non-volatile memory
- on a fuel gauge chip. The battery node should be used where there is
- no appropriate non-volatile memory, or it is unprogrammed/incorrect.
- Upstream dts files should not include battery nodes, unless the battery
- represented cannot easily be replaced in the system by one of a
- different type. This prevents unpredictable, potentially harmful,
- behavior should a replacement that changes the battery type occur
- without a corresponding update to the dtb.
- Required Properties:
- - compatible: Must be "simple-battery"
- Optional Properties:
- - voltage-min-design-microvolt: drained battery voltage
- - energy-full-design-microwatt-hours: battery design energy
- - charge-full-design-microamp-hours: battery design capacity
- - precharge-current-microamp: current for pre-charge phase
- - charge-term-current-microamp: current for charge termination phase
- - constant-charge-current-max-microamp: maximum constant input current
- - constant-charge-voltage-max-microvolt: maximum constant input voltage
- Battery properties are named, where possible, for the corresponding
- elements in enum power_supply_property, defined in
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/power_supply.h
- Batteries must be referenced by chargers and/or fuel-gauges
- using a phandle. The phandle's property should be named
- "monitored-battery".
- Example:
- bat: battery {
- compatible = "simple-battery";
- voltage-min-design-microvolt = <3200000>;
- energy-full-design-microwatt-hours = <5290000>;
- charge-full-design-microamp-hours = <1430000>;
- precharge-current-microamp = <256000>;
- charge-term-current-microamp = <128000>;
- constant-charge-current-max-microamp = <900000>;
- constant-charge-voltage-max-microvolt = <4200000>;
- };
- charger: charger@11 {
- ....
- monitored-battery = <&bat>;
- ...
- };
- fuel_gauge: fuel-gauge@22 {
- ....
- monitored-battery = <&bat>;
- ...
- };
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