1Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings
2
3Required properties:
4- compatible: Should be one of the following:
5  "sprd,sc2720-fgu",
6  "sprd,sc2721-fgu",
7  "sprd,sc2723-fgu",
8  "sprd,sc2730-fgu",
9  "sprd,sc2731-fgu".
10- reg: The address offset of fuel gauge unit.
11- battery-detect-gpios: GPIO for battery detection.
12- io-channels: Specify the IIO ADC channels to get temperature and charge voltage.
13- io-channel-names: Should be "bat-temp" or "charge-vol".
14- nvmem-cells: A phandle to the calibration cells provided by eFuse device.
15- nvmem-cell-names: Should be "fgu_calib".
16- sprd,calib-resistance-micro-ohms: Specify the real resistance of coulomb counter
17  chip in micro Ohms.
18- monitored-battery: Phandle of battery characteristics devicetree node.
19  See Documentation/devicetree/bindings/power/supply/battery.txt
20
21Example:
22
23	bat: battery {
24		compatible = "simple-battery";
25		charge-full-design-microamp-hours = <1900000>;
26		constant-charge-voltage-max-microvolt = <4350000>;
27		ocv-capacity-celsius = <20>;
28		ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>,
29					<4022000 85>, <3983000 80>, <3949000 75>,
30					<3917000 70>, <3889000 65>, <3864000 60>,
31					<3835000 55>, <3805000 50>, <3787000 45>,
32					<3777000 40>, <3773000 35>, <3770000 30>,
33					<3765000 25>, <3752000 20>, <3724000 15>,
34					<3680000 10>, <3605000 5>, <3400000 0>;
35		......
36	};
37
38	sc2731_pmic: pmic@0 {
39		compatible = "sprd,sc2731";
40		reg = <0>;
41		spi-max-frequency = <26000000>;
42		interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
43		interrupt-controller;
44		#interrupt-cells = <2>;
45		#address-cells = <1>;
46		#size-cells = <0>;
47
48		fgu@a00 {
49			compatible = "sprd,sc2731-fgu";
50			reg = <0xa00>;
51			battery-detect-gpios = <&pmic_eic 9 GPIO_ACTIVE_HIGH>;
52			io-channels = <&pmic_adc 5>, <&pmic_adc 14>;
53			io-channel-names = "bat-temp", "charge-vol";
54			nvmem-cells = <&fgu_calib>;
55			nvmem-cell-names = "fgu_calib";
56			monitored-battery = <&bat>;
57			sprd,calib-resistance-micro-ohms = <21500>;
58		};
59	};
60