kernel
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/power/supply/battery.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Battery Characteristics
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maintainers:
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- Sebastian Reichel <sre@kernel.org>
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description: |
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The devicetree battery node provides static battery characteristics.
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In smart batteries, these are typically stored in non-volatile memory
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on a fuel gauge chip. The battery node should be used where there is
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no appropriate non-volatile memory, or it is unprogrammed/incorrect.
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Upstream dts files should not include battery nodes, unless the battery
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represented cannot easily be replaced in the system by one of a
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different type. This prevents unpredictable, potentially harmful,
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behavior should a replacement that changes the battery type occur
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without a corresponding update to the dtb.
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Battery properties are named, where possible, for the corresponding elements
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in enum power_supply_property, defined in include/linux/power_supply.h
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Batteries must be referenced by chargers and/or fuel-gauges using a phandle.
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The phandle's property should be named "monitored-battery".
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properties:
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compatible:
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const: simple-battery
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device-chemistry:
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description: This describes the chemical technology of the battery.
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oneOf:
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- const: nickel-cadmium
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- const: nickel-metal-hydride
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- const: lithium-ion
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description: This is a blanket type for all lithium-ion batteries,
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including those below. If possible, a precise compatible string
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from below should be used, but sometimes it is unknown which specific
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lithium ion battery is employed and this wide compatible can be used.
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- const: lithium-ion-polymer
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- const: lithium-ion-iron-phosphate
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- const: lithium-ion-manganese-oxide
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over-voltage-threshold-microvolt:
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description: battery over-voltage limit
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re-charge-voltage-microvolt:
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description: limit to automatically start charging again
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voltage-min-design-microvolt:
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description: drained battery voltage
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voltage-max-design-microvolt:
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description: fully charged battery voltage
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energy-full-design-microwatt-hours:
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description: battery design energy
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charge-full-design-microamp-hours:
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description: battery design capacity
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trickle-charge-current-microamp:
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description: current for trickle-charge phase
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precharge-current-microamp:
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description: current for pre-charge phase
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precharge-upper-limit-microvolt:
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description: limit when to change to constant charging
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charge-term-current-microamp:
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description: current for charge termination phase
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constant-charge-current-max-microamp:
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description: maximum constant input current
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constant-charge-voltage-max-microvolt:
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description: maximum constant input voltage
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factory-internal-resistance-micro-ohms:
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description: battery factory internal resistance
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resistance-temp-table:
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$ref: /schemas/types.yaml#/definitions/uint32-matrix
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items:
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items:
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- description: the temperature in degree Celsius
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- description: battery internal resistance percent
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description: |
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A table providing the temperature in degree Celsius
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and corresponding battery internal resistance percent, which is used to
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look up the resistance percent according to current temperature to get an
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accurate batterty internal resistance in different temperatures.
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ocv-capacity-celsius:
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description: |
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An array containing the temperature in degree Celsius,
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for each of the battery capacity lookup table.
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operating-range-celsius:
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description: operating temperature range of a battery
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items:
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- description: minimum temperature at which battery can operate
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- description: maximum temperature at which battery can operate
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ambient-celsius:
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description: safe range of ambient temperature
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items:
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- description: alert when ambient temperature is lower than this value
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- description: alert when ambient temperature is higher than this value
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alert-celsius:
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description: safe range of battery temperature
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items:
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- description: alert when battery temperature is lower than this value
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- description: alert when battery temperature is higher than this value
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required:
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- compatible
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patternProperties:
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'^ocv-capacity-table-[0-9]+$':
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$ref: /schemas/types.yaml#/definitions/uint32-matrix
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description: |
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An array providing the open circuit voltage (OCV)
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of the battery and corresponding battery capacity percent, which is used
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to look up battery capacity according to current OCV value. And the open
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circuit voltage unit is microvolt.
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maxItems: 100
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items:
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items:
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- description: open circuit voltage (OCV) in microvolts
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- description: battery capacity percent
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maximum: 100
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additionalProperties: false
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examples:
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- |
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power {
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#address-cells = <1>;
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#size-cells = <0>;
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battery: battery {
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compatible = "simple-battery";
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over-voltage-threshold-microvolt = <4500000>;
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re-charge-voltage-microvolt = <250000>;
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voltage-min-design-microvolt = <3200000>;
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voltage-max-design-microvolt = <4200000>;
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energy-full-design-microwatt-hours = <5290000>;
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charge-full-design-microamp-hours = <1430000>;
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precharge-current-microamp = <256000>;
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precharge-upper-limit-microvolt = <2500000>;
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charge-term-current-microamp = <128000>;
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constant-charge-current-max-microamp = <900000>;
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constant-charge-voltage-max-microvolt = <4200000>;
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factory-internal-resistance-micro-ohms = <250000>;
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ocv-capacity-celsius = <(-10) 0 10>;
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/* table for -10 degree Celsius */
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ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>;
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/* table for 0 degree Celsius */
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ocv-capacity-table-1 = <4200000 100>, <4185000 95>, <4113000 90>;
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/* table for 10 degree Celsius */
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ocv-capacity-table-2 = <4250000 100>, <4200000 95>, <4185000 90>;
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resistance-temp-table = <20 100>, <10 90>, <0 80>, <(-10) 60>;
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operating-range-celsius = <(-30) 50>;
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ambient-celsius = <(-5) 50>;
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alert-celsius = <0 40>;
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};
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charger@11 {
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reg = <0x11>;
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monitored-battery = <&battery>;
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};
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fuel-gauge@22 {
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reg = <0x22>;
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monitored-battery = <&battery>;
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};
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};
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