dt-bindings: power: sc27xx: Add a new property to describe the real resistance...

dt-bindings: power: sc27xx: Add a new property to describe the real resistance of coulomb counter chip

Add a new property to describe the real resistance of coulomb counter chip,
which is used to calibrate the accuracy of the coulomb counter chip.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt

@@ -13,6 +13,8 @@ Required properties:
 - io-channel-names: Should be "bat-temp" or "charge-vol".
 - nvmem-cells: A phandle to the calibration cells provided by eFuse device.
 - nvmem-cell-names: Should be "fgu_calib".
+- sprd,calib-resistance-micro-ohms: Specify the real resistance of coulomb counter
+  chip in micro Ohms.
 - monitored-battery: Phandle of battery characteristics devicetree node.
   See Documentation/devicetree/bindings/power/supply/battery.txt
 
@@ -52,5 +54,6 @@ Example:
 			nvmem-cells = <&fgu_calib>;
 			nvmem-cell-names = "fgu_calib";
 			monitored-battery = <&bat>;
+			sprd,calib-resistance-micro-ohms = <21500>;
 		};
 	};