dt_bindings: ROHM BD99954 Charger
The ROHM BD99954 is a Battery Management LSI for 1-4 cell Lithium-Ion secondary battery. Intended to be used in space-constraint equipment such as Low profile Notebook PC, Tablets and other applications. BD99954 provides a Dual-source Battery Charger, two port BC1.2 detection and a Battery Monitor. Document the DT bindings for BD99954 Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Matti Vaittinen
Sebastian Reichel
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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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$id: http://devicetree.org/schemas/power/supply/rohm,bd99954.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: ROHM BD99954 Battery charger
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maintainers:
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- Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
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- Markus Laine <markus.laine@fi.rohmeurope.com>
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- Mikko Mutanen <mikko.mutanen@fi.rohmeurope.com>
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description: |
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The ROHM BD99954 is a Battery Management LSI for 1-4 cell Lithium-Ion
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secondary battery intended to be used in space-constraint equipment such
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as Low profile Notebook PC, Tablets and other applications. BD99954
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provides a Dual-source Battery Charger, two port BC1.2 detection and a
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Battery Monitor.
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properties:
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compatible:
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const: rohm,bd99954
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#
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# The battery charging profile of BD99954.
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#
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# Curve (1) represents charging current.
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# Curve (2) represents battery voltage.
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#
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# The BD99954 data sheet divides charging to three phases.
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# a) Trickle-charge with constant current (8).
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# b) pre-charge with constant current (6)
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# c) fast-charge with:
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# First a constant current (5) phase (CC)
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# Then constant voltage (CV) phase (after the battery voltage has reached
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# target level - until charging current has dropped to termination
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# level (7)
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#
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# V ^ ^ I
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# . .
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# . .
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# (4)- -.- - - - - - - - - - - - - - +++++++++++++++++++++++++++.
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# . / .
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# . ++++++/++ - - - - - - - - - - - - -.- - (5)
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# . + / + .
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# . + - -- .
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# . + - + .
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# . +.- -: .
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# . .+ +` .
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# . .- + | `/ .
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# . .." + .: .
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# . -" + -- .
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# . (2) ..." + | :- .
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# . ..."" + -: .
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# (3)- -.-.""- - - - -+++++++++ - - - - - - -.:- - - - - - - - - .- - (6)
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# . + `:. .
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# . + | -: .
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# . + -: .
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# . + .. .
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# . (1) + | "+++- - - -.- - (7)
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# -++++++++++++++- - - - - - - - - - - - - - - - - + - - - .- - (8)
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# . + -
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# -------------------------------------------------+++++++++-->
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# | | | CC | CV |
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# | --trickle-- | -pre- | ---------fast----------- |
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#
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# The charger uses the following battery properties
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# - trickle-charge-current-microamp:
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# Current used at trickle-charge phase (8 in above chart)
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# minimum: 64000
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# maximum: 1024000
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# multipleOf: 64000
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# - precharge-current-microamp:
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# Current used at pre-charge phase (6 in above chart)
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# minimum: 64000
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# maximum: 1024000
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# multipleOf: 64000
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# - constant-charge-current-max-microamp
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# Current used at fast charge constant current phase (5 in above chart)
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# minimum: 64000
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# maximum: 1024000
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# multipleOf: 64000
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# - constant-charge-voltage-max-microvolt
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# The constant voltage used in fast charging phase (4 in above chart)
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# minimum: 2560000
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# maximum: 19200000
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# multipleOf: 16000
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# - precharge-upper-limit-microvolt
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# charging mode is changed from trickle charging to pre-charging
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# when battery voltage exceeds this limit voltage (3 in above chart)
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# minimum: 2048000
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# maximum: 19200000
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# multipleOf: 64000
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# - re-charge-voltage-microvolt
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# minimum: 2560000
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# maximum: 19200000
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# multipleOf: 16000
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# re-charging is automatically started when battry has been discharging
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# to the point where the battery voltage drops below this limit
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# - over-voltage-threshold-microvolt
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# battery is expected to be faulty if battery voltage exceeds this limit.
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# Charger will then enter to a "battery faulty" -state
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# minimum: 2560000
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# maximum: 19200000
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# multipleOf: 16000
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# - charge-term-current-microamp
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# minimum: 0
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# maximum: 1024000
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# multipleOf: 64000
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# a charge cycle terminates when the battery voltage is above recharge
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# threshold, and the current is below this setting (7 in above chart)
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# See also Documentation/devicetree/bindings/power/supply/battery.txt
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monitored-battery:
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description:
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phandle of battery characteristics devicetree node
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rohm,vsys-regulation-microvolt:
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description: system specific lower limit for system voltage.
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minimum: 2560000
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maximum: 19200000
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multipleOf: 64000
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rohm,vbus-input-current-limit-microamp:
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description: system specific VBUS input current limit (in microamps).
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minimum: 32000
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maximum: 16352000
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multipleOf: 32000
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rohm,vcc-input-current-limit-microamp:
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description: system specific VCC/VACP input current limit (in microamps).
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minimum: 32000
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maximum: 16352000
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multipleOf: 32000
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required:
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- compatible
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examples:
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- |
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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charger@9 {
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compatible = "rohm,bd99954";
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monitored-battery = <&battery>;
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reg = <0x9>;
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interrupt-parent = <&gpio1>;
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interrupts = <29 8>;
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rohm,vsys-regulation-microvolt = <8960000>;
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rohm,vbus-input-current-limit-microamp = <1472000>;
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rohm,vcc-input-current-limit-microamp = <1472000>;
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};
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};
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