arm64: tegra: Enable cros-ec and charger on Smaug

Add nodes for the ChromeOS Embedded Controller and for the gas gauge
connected to the I2C bus that it controls.
Signed-off-by: NRhyland Klein <rklein@nvidia.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra210-smaug.dts

@@ -1300,6 +1300,33 @@
 		status = "okay";
 	};
 
+	i2c@7000c400 {
+		status = "okay";
+		clock-frequency = <1000000>;
+
+		ec@1e {
+			compatible = "google,cros-ec-i2c";
+			reg = <0x1e>;
+			interrupt-parent = <&gpio>;
+			interrupts = <TEGRA_GPIO(Z, 1) IRQ_TYPE_LEVEL_LOW>;
+			wakeup-source;
+
+			ec_i2c_0: i2c-tunnel {
+				compatible = "google,cros-ec-i2c-tunnel";
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				google,remote-bus = <0>;
+
+				battery: bq27742@55 {
+					compatible = "ti,bq27742";
+					reg = <0x55>;
+					battery-name = "battery";
+				};
+			};
+		};
+	};
+
 	pmc@7000e400 {
 		nvidia,invert-interrupt;
 		nvidia,suspend-mode = <0>;