diff --git a/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp.dts b/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp.dts
index cc1de29bd8a..8e53dfe09dc 100644
--- a/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp.dts
+++ b/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp.dts
@@ -83,6 +83,10 @@
 	};
 };
 
+&uart00 {
+	/delete-property/ clocks;
+};
+
 &uart20 {
 	status = "okay";
 	current-speed = <115200>;
diff --git a/dts/common/nordic/nrf54l20.dtsi b/dts/common/nordic/nrf54l20.dtsi
index c7622bbcac2..7f33221b0e7 100644
--- a/dts/common/nordic/nrf54l20.dtsi
+++ b/dts/common/nordic/nrf54l20.dtsi
@@ -46,6 +46,12 @@
 			#clock-cells = <0>;
 			clock-frequency = <DT_FREQ_M(32)>;
 		};
+
+		hfpll: hfpll {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <DT_FREQ_M(128)>;
+		};
 	};
 
 	soc {
@@ -117,6 +123,7 @@
 				compatible = "nordic,nrf-uarte";
 				reg = <0x4d000 0x1000>;
 				interrupts = <77 NRF_DEFAULT_IRQ_PRIORITY>;
+				clocks = <&hfpll>;
 				status = "disabled";
 				endtx-stoptx-supported;
 				frame-timeout-supported;
diff --git a/dts/common/nordic/nrf54l_05_10_15.dtsi b/dts/common/nordic/nrf54l_05_10_15.dtsi
index 04fae0272bc..633b1d425e4 100644
--- a/dts/common/nordic/nrf54l_05_10_15.dtsi
+++ b/dts/common/nordic/nrf54l_05_10_15.dtsi
@@ -59,6 +59,12 @@
 			#clock-cells = <0>;
 			clock-frequency = <DT_FREQ_M(32)>;
 		};
+
+		hfpll: hfpll {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <DT_FREQ_M(128)>;
+		};
 	};
 
 	soc {
@@ -138,6 +144,7 @@
 				compatible = "nordic,nrf-uarte";
 				reg = <0x4a000 0x1000>;
 				interrupts = <74 NRF_DEFAULT_IRQ_PRIORITY>;
+				clocks = <&hfpll>;
 				status = "disabled";
 				endtx-stoptx-supported;
 				frame-timeout-supported;