Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/power/supply/rohm,bd99954.yaml
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1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause 2 %YAML 1.2 3 --- 4 $id: http://devicetree.org/schemas/power/supply/rohm,bd99954.yaml# 5 $schema: http://devicetree.org/meta-schemas/core.yaml# 6 7 title: ROHM BD99954 Battery charger 8 9 maintainers: 10 - Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> 11 - Markus Laine <markus.laine@fi.rohmeurope.com> 12 - Mikko Mutanen <mikko.mutanen@fi.rohmeurope.com> 13 14 description: | 15 The ROHM BD99954 is a Battery Management LSI for 1-4 cell Lithium-Ion 16 secondary battery intended to be used in space-constraint equipment such 17 as Low profile Notebook PC, Tablets and other applications. BD99954 18 provides a Dual-source Battery Charger, two port BC1.2 detection and a 19 Battery Monitor. 20 21 22 properties: 23 compatible: 24 const: rohm,bd99954 25 # 26 # The battery charging profile of BD99954. 27 # 28 # Curve (1) represents charging current. 29 # Curve (2) represents battery voltage. 30 # 31 # The BD99954 data sheet divides charging to three phases. 32 # a) Trickle-charge with constant current (8). 33 # b) pre-charge with constant current (6) 34 # c) fast-charge with: 35 # First a constant current (5) phase (CC) 36 # Then constant voltage (CV) phase (after the battery voltage has reached 37 # target level - until charging current has dropped to termination 38 # level (7) 39 # 40 # V ^ ^ I 41 # . . 42 # . . 43 # (4)- -.- - - - - - - - - - - - - - +++++++++++++++++++++++++++. 44 # . / . 45 # . ++++++/++ - - - - - - - - - - - - -.- - (5) 46 # . + / + . 47 # . + - -- . 48 # . + - + . 49 # . +.- -: . 50 # . .+ +` . 51 # . .- + | `/ . 52 # . .." + .: . 53 # . -" + -- . 54 # . (2) ..." + | :- . 55 # . ..."" + -: . 56 # (3)- -.-.""- - - - -+++++++++ - - - - - - -.:- - - - - - - - - .- - (6) 57 # . + `:. . 58 # . + | -: . 59 # . + -: . 60 # . + .. . 61 # . (1) + | "+++- - - -.- - (7) 62 # -++++++++++++++- - - - - - - - - - - - - - - - - + - - - .- - (8) 63 # . + - 64 # -------------------------------------------------+++++++++--> 65 # | | | CC | CV | 66 # | --trickle-- | -pre- | ---------fast----------- | 67 # 68 # The charger uses the following battery properties 69 # - trickle-charge-current-microamp: 70 # Current used at trickle-charge phase (8 in above chart) 71 # minimum: 64000 72 # maximum: 1024000 73 # multipleOf: 64000 74 # - precharge-current-microamp: 75 # Current used at pre-charge phase (6 in above chart) 76 # minimum: 64000 77 # maximum: 1024000 78 # multipleOf: 64000 79 # - constant-charge-current-max-microamp 80 # Current used at fast charge constant current phase (5 in above chart) 81 # minimum: 64000 82 # maximum: 1024000 83 # multipleOf: 64000 84 # - constant-charge-voltage-max-microvolt 85 # The constant voltage used in fast charging phase (4 in above chart) 86 # minimum: 2560000 87 # maximum: 19200000 88 # multipleOf: 16000 89 # - precharge-upper-limit-microvolt 90 # charging mode is changed from trickle charging to pre-charging 91 # when battery voltage exceeds this limit voltage (3 in above chart) 92 # minimum: 2048000 93 # maximum: 19200000 94 # multipleOf: 64000 95 # - re-charge-voltage-microvolt 96 # minimum: 2560000 97 # maximum: 19200000 98 # multipleOf: 16000 99 # re-charging is automatically started when battry has been discharging 100 # to the point where the battery voltage drops below this limit 101 # - over-voltage-threshold-microvolt 102 # battery is expected to be faulty if battery voltage exceeds this limit. 103 # Charger will then enter to a "battery faulty" -state 104 # minimum: 2560000 105 # maximum: 19200000 106 # multipleOf: 16000 107 # - charge-term-current-microamp 108 # minimum: 0 109 # maximum: 1024000 110 # multipleOf: 64000 111 # a charge cycle terminates when the battery voltage is above recharge 112 # threshold, and the current is below this setting (7 in above chart) 113 # See also Documentation/devicetree/bindings/power/supply/battery.yaml 114 115 reg: 116 maxItems: 1 117 118 interrupts: 119 maxItems: 1 120 121 monitored-battery: 122 description: 123 phandle of battery characteristics devicetree node 124 125 rohm,vsys-regulation-microvolt: 126 description: system specific lower limit for system voltage. 127 minimum: 2560000 128 maximum: 19200000 129 multipleOf: 64000 130 131 rohm,vbus-input-current-limit-microamp: 132 description: system specific VBUS input current limit (in microamps). 133 minimum: 32000 134 maximum: 16352000 135 multipleOf: 32000 136 137 rohm,vcc-input-current-limit-microamp: 138 description: system specific VCC/VACP input current limit (in microamps). 139 minimum: 32000 140 maximum: 16352000 141 multipleOf: 32000 142 143 required: 144 - compatible 145 146 additionalProperties: false 147 148 examples: 149 - | 150 i2c { 151 #address-cells = <1>; 152 #size-cells = <0>; 153 charger@9 { 154 compatible = "rohm,bd99954"; 155 monitored-battery = <&battery>; 156 reg = <0x9>; 157 interrupt-parent = <&gpio1>; 158 interrupts = <29 8>; 159 rohm,vsys-regulation-microvolt = <8960000>; 160 rohm,vbus-input-current-limit-microamp = <1472000>; 161 rohm,vcc-input-current-limit-microamp = <1472000>; 162 }; 163 };
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