diff --git a/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp.dts b/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp.dts
index 5a77d6c2e98..7d0a2f96aa5 100644
--- a/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp.dts
+++ b/boards/native/nrf_bsim/nrf54l15bsim_nrf54l15_cpuapp.dts
@@ -85,6 +85,10 @@
 	};
 };
 
+&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 d06c4814103..7487915cdfd 100644
--- a/dts/common/nordic/nrf54l20.dtsi
+++ b/dts/common/nordic/nrf54l20.dtsi
@@ -52,6 +52,12 @@
 			#clock-cells = <0>;
 			clock-frequency = <DT_FREQ_M(32)>;
 		};
+
+		hfpll: hfpll {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <DT_FREQ_M(128)>;
+		};
 	};
 
 	soc {
@@ -123,6 +129,7 @@
 				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 eba41095e75..d1141643ef1 100644
--- a/dts/common/nordic/nrf54l_05_10_15.dtsi
+++ b/dts/common/nordic/nrf54l_05_10_15.dtsi
@@ -65,6 +65,12 @@
 			#clock-cells = <0>;
 			clock-frequency = <DT_FREQ_M(32)>;
 		};
+
+		hfpll: hfpll {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <DT_FREQ_M(128)>;
+		};
 	};
 
 	soc {
@@ -144,6 +150,7 @@
 				compatible = "nordic,nrf-uarte";
 				reg = <0x4a000 0x1000>;
 				interrupts = <74 NRF_DEFAULT_IRQ_PRIORITY>;
+				clocks = <&hfpll>;
 				status = "disabled";
 				endtx-stoptx-supported;
 				frame-timeout-supported;