Documentation/devicetree/bindings/power/supply/battery.txt

   1 Battery Characteristics
   2
   3 The devicetree battery node provides static battery characteristics.
   4 In smart batteries, these are typically stored in non-volatile memory
   5 on a fuel gauge chip. The battery node should be used where there is
   6 no appropriate non-volatile memory, or it is unprogrammed/incorrect.
   7
   8 Upstream dts files should not include battery nodes, unless the battery
   9 represented cannot easily be replaced in the system by one of a
  10 different type. This prevents unpredictable, potentially harmful,
  11 behavior should a replacement that changes the battery type occur
  12 without a corresponding update to the dtb.
  13
  14 Required Properties:
  15  - compatible: Must be "simple-battery"
  16
  17 Optional Properties:
  18  - voltage-min-design-microvolt: drained battery voltage
  19  - energy-full-design-microwatt-hours: battery design energy
  20  - charge-full-design-microamp-hours: battery design capacity
  21  - precharge-current-microamp: current for pre-charge phase
  22  - charge-term-current-microamp: current for charge termination phase
  23  - constant-charge-current-max-microamp: maximum constant input current
  24  - constant-charge-voltage-max-microvolt: maximum constant input voltage
  25
  26 Battery properties are named, where possible, for the corresponding
  27 elements in enum power_supply_property, defined in
  28 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/power_supply.h
  29
  30 Batteries must be referenced by chargers and/or fuel-gauges
  31 using a phandle. The phandle's property should be named
  32 "monitored-battery".
  33
  34 Example:
  35
  36         bat: battery {
  37                 compatible = "simple-battery";
  38                 voltage-min-design-microvolt = <3200000>;
  39                 energy-full-design-microwatt-hours = <5290000>;
  40                 charge-full-design-microamp-hours = <1430000>;
  41                 precharge-current-microamp = <256000>;
  42                 charge-term-current-microamp = <128000>;
  43                 constant-charge-current-max-microamp = <900000>;
  44                 constant-charge-voltage-max-microvolt = <4200000>;
  45         };
  46
  47         charger: charger@11 {
  48                 ....
  49                 monitored-battery = <&bat>;
  50                 ...
  51         };
  52
  53         fuel_gauge: fuel-gauge@22 {
  54                 ....
  55                 monitored-battery = <&bat>;
  56                 ...
  57         };