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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/power/supply/battery.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Battery Characteristics8 9maintainers:10 - Sebastian Reichel <sre@kernel.org>11 12description: |13 The devicetree battery node provides static battery characteristics.14 In smart batteries, these are typically stored in non-volatile memory15 on a fuel gauge chip. The battery node should be used where there is16 no appropriate non-volatile memory, or it is unprogrammed/incorrect.17 18 Upstream dts files should not include battery nodes, unless the battery19 represented cannot easily be replaced in the system by one of a20 different type. This prevents unpredictable, potentially harmful,21 behavior should a replacement that changes the battery type occur22 without a corresponding update to the dtb.23 24 Battery properties are named, where possible, for the corresponding elements25 in enum power_supply_property, defined in include/linux/power_supply.h26 27 Batteries must be referenced by chargers and/or fuel-gauges using a phandle.28 The phandle's property should be named "monitored-battery".29 30properties:31 compatible:32 const: simple-battery33 34 device-chemistry:35 description: This describes the chemical technology of the battery.36 oneOf:37 - const: nickel-cadmium38 - const: nickel-metal-hydride39 - const: lithium-ion40 description: This is a blanket type for all lithium-ion batteries,41 including those below. If possible, a precise compatible string42 from below should be used, but sometimes it is unknown which specific43 lithium ion battery is employed and this wide compatible can be used.44 - const: lithium-ion-polymer45 - const: lithium-ion-iron-phosphate46 - const: lithium-ion-manganese-oxide47 48 over-voltage-threshold-microvolt:49 description: battery over-voltage limit50 51 re-charge-voltage-microvolt:52 description: limit to automatically start charging again53 54 voltage-min-design-microvolt:55 description: drained battery voltage56 57 voltage-max-design-microvolt:58 description: fully charged battery voltage59 60 energy-full-design-microwatt-hours:61 description: battery design energy62 63 charge-full-design-microamp-hours:64 description: battery design capacity65 66 trickle-charge-current-microamp:67 description: current for trickle-charge phase68 69 precharge-current-microamp:70 description: current for pre-charge phase71 72 precharge-upper-limit-microvolt:73 description: limit when to change to constant charging74 75 charge-term-current-microamp:76 description: current for charge termination phase77 78 constant-charge-current-max-microamp:79 description: maximum constant input current80 81 constant-charge-voltage-max-microvolt:82 description: maximum constant input voltage83 84 factory-internal-resistance-micro-ohms:85 description: battery factory internal resistance86 87 resistance-temp-table:88 $ref: /schemas/types.yaml#/definitions/uint32-matrix89 items:90 items:91 - description: the temperature in degree Celsius92 - description: battery internal resistance percent93 description: |94 A table providing the temperature in degree Celsius95 and corresponding battery internal resistance percent, which is used to96 look up the resistance percent according to current temperature to get an97 accurate batterty internal resistance in different temperatures.98 99 ocv-capacity-celsius:100 description: |101 An array containing the temperature in degree Celsius,102 for each of the battery capacity lookup table.103 104 operating-range-celsius:105 description: operating temperature range of a battery106 items:107 - description: minimum temperature at which battery can operate108 - description: maximum temperature at which battery can operate109 110 ambient-celsius:111 description: safe range of ambient temperature112 items:113 - description: alert when ambient temperature is lower than this value114 - description: alert when ambient temperature is higher than this value115 116 alert-celsius:117 description: safe range of battery temperature118 items:119 - description: alert when battery temperature is lower than this value120 - description: alert when battery temperature is higher than this value121 122required:123 - compatible124 125patternProperties:126 '^ocv-capacity-table-[0-9]+$':127 $ref: /schemas/types.yaml#/definitions/uint32-matrix128 description: |129 An array providing the open circuit voltage (OCV)130 of the battery and corresponding battery capacity percent, which is used131 to look up battery capacity according to current OCV value. And the open132 circuit voltage unit is microvolt.133 maxItems: 100134 items:135 items:136 - description: open circuit voltage (OCV) in microvolts137 - description: battery capacity percent138 maximum: 100139 140additionalProperties: false141 142examples:143 - |144 power {145 #address-cells = <1>;146 #size-cells = <0>;147 148 battery: battery {149 compatible = "simple-battery";150 over-voltage-threshold-microvolt = <4500000>;151 re-charge-voltage-microvolt = <250000>;152 voltage-min-design-microvolt = <3200000>;153 voltage-max-design-microvolt = <4200000>;154 energy-full-design-microwatt-hours = <5290000>;155 charge-full-design-microamp-hours = <1430000>;156 precharge-current-microamp = <256000>;157 precharge-upper-limit-microvolt = <2500000>;158 charge-term-current-microamp = <128000>;159 constant-charge-current-max-microamp = <900000>;160 constant-charge-voltage-max-microvolt = <4200000>;161 factory-internal-resistance-micro-ohms = <250000>;162 ocv-capacity-celsius = <(-10) 0 10>;163 /* table for -10 degree Celsius */164 ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>;165 /* table for 0 degree Celsius */166 ocv-capacity-table-1 = <4200000 100>, <4185000 95>, <4113000 90>;167 /* table for 10 degree Celsius */168 ocv-capacity-table-2 = <4250000 100>, <4200000 95>, <4185000 90>;169 resistance-temp-table = <20 100>, <10 90>, <0 80>, <(-10) 60>;170 operating-range-celsius = <(-30) 50>;171 ambient-celsius = <(-5) 50>;172 alert-celsius = <0 40>;173 };174 175 charger@11 {176 reg = <0x11>;177 monitored-battery = <&battery>;178 };179 180 fuel-gauge@22 {181 reg = <0x22>;182 monitored-battery = <&battery>;183 };184 };185