ARM: tegra: chagall: Add embedded controller node

Add embedded controller node to Pegatron Chagall device-tree.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Link: https://lore.kernel.org/r/20250429061803.9581-5-clamor95@gmail.com
Signed-off-by: Thierry Reding <treding@nvidia.com>

Author: clamor-s

arch/arm/boot/dts/nvidia/tegra30-pegatron-chagall.dts

@@ -1155,6 +1155,14 @@
 		status = "okay";
 		clock-frequency = <400000>;
 
+		embedded-controller@10 {
+			compatible = "pegatron,chagall-ec";
+			reg = <0x10>;
+
+			monitored-battery = <&battery>;
+			power-supplies = <&mains>;
+		};
+
 		/* Wolfson Microelectronics WM8903 audio codec */
 		wm8903: audio-codec@1a {
 			compatible = "wlf,wm8903";
@@ -2596,6 +2604,14 @@
 		default-brightness-level = <15>;
 	};
 
+	battery: battery-cell {
+		compatible = "simple-battery";
+		device-chemistry = "lithium-ion-polymer";
+		charge-full-design-microamp-hours = <3050000>;
+		energy-full-design-microwatt-hours = <23000000>;
+		operating-range-celsius = <0 45>;
+	};
+
 	/* PMIC has a built-in 32KHz oscillator which is used by PMC */
 	clk32k_in: clock-32k {
 		compatible = "fixed-clock";