diff --git a/arch/arm/boot/dts/renesas/r9a06g032-rzn1d400-db.dts b/arch/arm/boot/dts/renesas/r9a06g032-rzn1d400-db.dts
index d734a432b3ec..3258b2e27434 100644
--- a/arch/arm/boot/dts/renesas/r9a06g032-rzn1d400-db.dts
+++ b/arch/arm/boot/dts/renesas/r9a06g032-rzn1d400-db.dts
@@ -171,6 +171,10 @@ &eth_miic {
 	renesas,miic-switch-portin = <MIIC_GMAC2_PORT>;
 };
 
+&ext_rtc_clk {
+	clock-frequency = <32768>;
+};
+
 &gmac2 {
 	status = "okay";
 	phy-mode = "gmii";
diff --git a/arch/arm/boot/dts/renesas/r9a06g032.dtsi b/arch/arm/boot/dts/renesas/r9a06g032.dtsi
index 80ad1fdc77a0..13a60656b044 100644
--- a/arch/arm/boot/dts/renesas/r9a06g032.dtsi
+++ b/arch/arm/boot/dts/renesas/r9a06g032.dtsi
@@ -73,8 +73,8 @@ rtc0: rtc@40006000 {
 				     <GIC_SPI 67 IRQ_TYPE_EDGE_RISING>,
 				     <GIC_SPI 68 IRQ_TYPE_EDGE_RISING>;
 			interrupt-names = "alarm", "timer", "pps";
-			clocks = <&sysctrl R9A06G032_HCLK_RTC>;
-			clock-names = "hclk";
+			clocks = <&sysctrl R9A06G032_HCLK_RTC>, <&ext_rtc_clk>;
+			clock-names = "hclk", "xtal";
 			power-domains = <&sysctrl>;
 			status = "disabled";
 		};