From: Thomas Antoine <t.antoine@xxxxxxxxxxxx> The Maxim MAX77759 is a companion PMIC for USB Type-C. It contains Battery Charger, Fuel Gauge, temperature sensors, USB Type-C Port Controller (TCPC), NVMEM, and additional GPIO interfaces Use max77759-fg compatible to avoid conflict with drivers for other functions. The battery node is used to pass the REPCAP and ICHGTERM values needed for the initialization of the fuel gauge. The nvmem cells are used to get initialization values and to backup the learning and the number of cycles. It should work out of the box with gs101-oriole and gs101-raven which were previously running Android. Signed-off-by: Thomas Antoine <t.antoine@xxxxxxxxxxxx> --- .../bindings/power/supply/maxim,max77759.yaml | 76 ++++++++++++++++++++++ 1 file changed, 76 insertions(+) diff --git a/Documentation/devicetree/bindings/power/supply/maxim,max77759.yaml b/Documentation/devicetree/bindings/power/supply/maxim,max77759.yaml new file mode 100644 index 0000000000000000000000000000000000000000..5e160e3ad86849f9ee0be54e20e195fc455eba6d --- /dev/null +++ b/Documentation/devicetree/bindings/power/supply/maxim,max77759.yaml @@ -0,0 +1,76 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/power/supply/maxim,max77759.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Maxim Integrated MAX77759 fuel gauge + +maintainers: + - Thomas Antoine <t.antoine@xxxxxxxxxxxx> + +properties: + compatible: + const: maxim,max77759-fg + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + shunt-resistor-micro-ohms: + description: The value of the current sense resistor in microohms. + + monitored-battery: + description: | + The fuel gauge needs the following battery properties: + - charge-full-design-microamp-hours + - charge-term-current-microamp + + nvmem-cells: + maxItems: 1 + description: | + Saved fuel gauge state. This state will be used during the initialization + and saved on exit. It must be initialized beforehand. + Its layout must be composed of + - RCOMP0 (characterization of the open-circuit voltage) + - TCOMPO (temperature compensation information) + - FULLCAPREP (reported full capacity) + - QRTABLE00, QRTABLE10, QRTABLE20, QRTABLE30 (cell capacity information) + - cv_mixcap (remaining capacity of the cell without empty compensation) + - cv_halftime (time-to-full characterization time constant) + They must all be aligned on 2 bytes. A valid CRC8 checksum must + also be found at the end (polynomial x^8 + x^2 + x + 1). + + nvmem-cell-names: + const: fg_state + +required: + - compatible + - reg + - shunt-resistor-micro-ohms + - monitored-battery + - nvmem-cells + - nvmem-cell-names + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/irq.h> + i2c { + #address-cells = <1>; + #size-cells = <0>; + + fuel-gauge@36 { + compatible = "maxim,max77759-fg"; + reg = <0x36>; + interrupt-parent = <&gpa9>; + interrupts = <3 IRQ_TYPE_LEVEL_LOW>; + shunt-resistor-micro-ohms = <5000>; + monitored-battery = <&battery>; + nvmem-cell-names = "fg_state"; + nvmem-cells = <&fg_state>; + }; + }; -- 2.50.1
