diff --git a/boards/arm/96b_aerocore2/96b_aerocore2.dts b/boards/arm/96b_aerocore2/96b_aerocore2.dts
index 4a4e8672f7ff1a..dd5f8d8a89592f 100644
--- a/boards/arm/96b_aerocore2/96b_aerocore2.dts
+++ b/boards/arm/96b_aerocore2/96b_aerocore2.dts
@@ -42,6 +42,10 @@
 
 };
 
+&clk_lsi {
+	status = "okay";
+};
+
 &clk_hse {
 	clock-frequency = <DT_FREQ_M(24)>;
 	status = "okay";
@@ -180,6 +184,12 @@ zephyr_udc0: &usbotg_fs {
 	status = "okay";
 };
 
+&rtc {
+	clocks = <&rcc STM32_CLOCK_BUS_APB1 0x10000000>,
+		 <&rcc STM32_SRC_LSI RTC_SEL(2)>;
+	status = "okay";
+};
+
 &rng {
 	status = "okay";
 };
diff --git a/boards/arm/az3166_iotdevkit/az3166_iotdevkit.dts b/boards/arm/az3166_iotdevkit/az3166_iotdevkit.dts
index 13b641719ee010..4c77535ce21200 100644
--- a/boards/arm/az3166_iotdevkit/az3166_iotdevkit.dts
+++ b/boards/arm/az3166_iotdevkit/az3166_iotdevkit.dts
@@ -205,3 +205,9 @@
 		pinctrl-names = "default";
 	};
 };
+
+&rtc {
+	clocks = <&rcc STM32_CLOCK_BUS_APB1 0x10000000>,
+		 <&rcc STM32_SRC_LSI RTC_SEL(2)>;
+	status = "okay";
+};