This patch adds the binding documentation for Spreadtrum SC27XX series PMICs fuel gauge unit device, which is used to calculate the battery capacity.
Signed-off-by: Baolin Wang <[email protected]> --- .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 ++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt new file mode 100644 index 0000000..7447bae --- /dev/null +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt @@ -0,0 +1,55 @@ +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings + +Required properties: +- compatible: Should be one of the following: + "sprd,sc2720-fgu", + "sprd,sc2721-fgu", + "sprd,sc2723-fgu", + "sprd,sc2730-fgu", + "sprd,sc2731-fgu". +- reg: The address offset of fuel gauge unit. +- bat-detect-gpio: GPIO for battery detection. +- io-channels: Specify the IIO ADC channel to get temperature. +- io-channel-names: Should be "bat-temp". +- sprd,inner-resist: Specify the the battery inner resistance (mOhm). +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding + open circuit voltage (ocv) of the battery, which is used to look up current + battery capacity according to current baterry ocv values. +- monitored-battery: Phandle of battery characteristics devicetree node. + The fuel gauge uses the following battery properties: +- charge-full-design-microamp-hours: battery design capacity. +- constant-charge-voltage-max-microvolt: maximum constant input voltage. + See Documentation/devicetree/bindings/power/supply/battery.txt + +Example: + + bat: battery { + compatible = "simple-battery"; + charge-full-design-microamp-hours = <1900000>; + constant-charge-voltage-max-microvolt = <4350000>; + ...... + }; + + sc2731_pmic: pmic@0 { + compatible = "sprd,sc2731"; + reg = <0>; + spi-max-frequency = <26000000>; + interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>; + interrupt-controller; + #interrupt-cells = <2>; + #address-cells = <1>; + #size-cells = <0>; + + fgu@a00 { + compatible = "sprd,sc2731-fgu"; + reg = <0xa00>; + bat-detect-gpio = <&pmic_eic 9 GPIO_ACTIVE_HIGH>; + io-channels = <&pmic_adc 5>; + io-channel-names = "bat-temp"; + sprd,inner-resist = <250>; + sprd,ocv-cap-table = <4185 100>, <4113 95>, <4066 90>, <4022 85>, <3983 80>, <3949 75>, <3917 70>, + <3889 65>, <3864 60>, <3835 55>, <3805 50>, <3787 45>, <3777 40>, <3773 35>, <3770 30>, + <3765 25>, <3752 20>, <3724 15>, <3680 10>, <3605 5>, <3400 0>; + monitored-battery = <&bat>; + }; + }; -- 1.7.9.5
