diff --git a/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi
index b9a453f6b290..95a6a0b1dd75 100644
--- a/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi
@@ -8,6 +8,7 @@
  */
 
 #include <dt-bindings/leds/common.h>
+#include <dt-bindings/regulator/nxp,pca9450-regulator.h>
 
 #include "imx91.dtsi"
 
@@ -160,6 +161,7 @@ buck5: BUCK5 {
 				regulator-min-microvolt = <1800000>;
 				regulator-boot-on;
 				regulator-always-on;
+				regulator-initial-mode = <PCA9450_BUCK_MODE_FORCE_PWM>;
 			};
 
 			buck6: BUCK6 {
diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
index 94eb04ace96e..d59a89254623 100644
--- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
@@ -9,6 +9,7 @@
  */
 
 #include <dt-bindings/leds/common.h>
+#include <dt-bindings/regulator/nxp,pca9450-regulator.h>
 
 #include "imx93.dtsi"
 
@@ -162,6 +163,7 @@ buck5: BUCK5 {
 				regulator-max-microvolt = <1800000>;
 				regulator-boot-on;
 				regulator-always-on;
+				regulator-initial-mode = <PCA9450_BUCK_MODE_FORCE_PWM>;
 			};
 
 			buck6: BUCK6 {