arm64: dts: mediatek: mt7988-bpi-r4: add uart1 / uart2

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>

Author: frank-w

arch/arm64/boot/dts/mediatek/mt7988a-bananapi-bpi-r4.dtsi

@@ -445,6 +445,20 @@
 			groups = "spi0", "spi0_wp_hold";
 		};
 	};
+
+	uart1_2_lite_pins: uart1-2-lite-pins {
+		mux {
+			function = "uart";
+			groups = "uart1_2_lite";
+		};
+	};
+
+	uart2_3_lite_pins: uart2-3-lite-pins {
+		mux {
+			function = "uart";
+			groups = "uart2_3_lite";
+		};
+	};
 };
 
 &pwm {
@@ -455,6 +469,18 @@
 	status = "okay";
 };
 
+&serial1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart1_2_lite_pins>;
+	status = "okay";
+};
+
+&serial2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart2_3_lite_pins>;
+	status = "okay";
+};
+
 &spi0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&spi0_flash_pins>;