ARM: dts: msm: Add external rsense channel for iadc

Add external rsense channel for iadc that allows read
current through battery when using external rsense.

Change-Id: I30302cad884471f23e16909583c1d242b9fb5267
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>
diff --git a/arch/arm/boot/dts/msm-pm8226.dtsi b/arch/arm/boot/dts/msm-pm8226.dtsi
index f65e282..b9bcd0c 100644
--- a/arch/arm/boot/dts/msm-pm8226.dtsi
+++ b/arch/arm/boot/dts/msm-pm8226.dtsi
@@ -433,6 +433,16 @@
 				qcom,hw-settle-time = <0>;
 				qcom,fast-avg-setup = <0>;
 			};
+			chan@1 {
+				label = "external_rsense";
+				reg = <1>;
+				qcom,decimation = <0>;
+				qcom,pre-div-channel-scaling = <1>;
+				qcom,calibration-type = "absolute";
+				qcom,scale-function = <0>;
+				qcom,hw-settle-time = <0>;
+				qcom,fast-avg-setup = <0>;
+			};
 		};
 
 		pm8226_adc_tm: vadc@3400 {