diff --git a/arch/arm64/boot/dts/renesas/rzg3s-smarc.dtsi b/arch/arm64/boot/dts/renesas/rzg3s-smarc.dtsi
new file mode 100644
index 000000000000..e7073a09ed2e
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/rzg3s-smarc.dtsi
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Device Tree Source for the RZ SMARC Carrier-II Board.
+ *
+ * Copyright (C) 2023 Renesas Electronics Corp.
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pinctrl/rzg2l-pinctrl.h>
+
+/ {
+	aliases {
+		serial0 = &scif0;
+	};
+};
+
+&pinctrl {
+	scif0_pins: scif0 {
+		pinmux = <RZG2L_PORT_PINMUX(6, 3, 1)>, /* RXD */
+			 <RZG2L_PORT_PINMUX(6, 4, 1)>; /* TXD */
+	};
+};
+
+&scif0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&scif0_pins>;
+	status = "okay";
+};