diff --git a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
index 4ffe5c3faea0..a5486c36830f 100644
--- a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
@@ -100,6 +100,15 @@ properties:
               PMIC default "STANDBY" state voltage in uV. Only Buck1~3 have such
               dvs(dynamic voltage scaling) property.
 
+          regulator-allowed-modes:
+            description: |
+              Buck regulator operating modes allowed. Valid values below.
+              Users should use the macros from dt-bindings/regulator/nxp,pca9450-regulator.h
+                0 (PCA9450_BUCK_MODE_AUTO): Auto PFM/PWM mode
+                1 (PCA9450_BUCK_MODE_FORCE_PWM): Forced PWM mode
+            items:
+              enum: [ 0, 1 ]
+
         unevaluatedProperties: false
 
     additionalProperties: false
@@ -143,6 +152,7 @@ allOf:
 examples:
   - |
     #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/regulator/nxp,pca9450-regulator.h>
 
     i2c {
         #address-cells = <1>;
@@ -179,6 +189,8 @@ examples:
                     regulator-max-microvolt = <3400000>;
                     regulator-boot-on;
                     regulator-always-on;
+                    regulator-initial-mode = <PCA9450_BUCK_MODE_FORCE_PWM>;
+                    regulator-allowed-modes = <PCA9450_BUCK_MODE_FORCE_PWM>;
                 };
                 buck5: BUCK5 {
                     regulator-name = "BUCK5";
@@ -186,6 +198,8 @@ examples:
                     regulator-max-microvolt = <3400000>;
                     regulator-boot-on;
                     regulator-always-on;
+                    regulator-allowed-modes = <PCA9450_BUCK_MODE_AUTO
+                                               PCA9450_BUCK_MODE_FORCE_PWM>;
                 };
                 buck6: BUCK6 {
                     regulator-name = "BUCK6";
diff --git a/include/dt-bindings/regulator/nxp,pca9450-regulator.h b/include/dt-bindings/regulator/nxp,pca9450-regulator.h
new file mode 100644
index 000000000000..08434caef429
--- /dev/null
+++ b/include/dt-bindings/regulator/nxp,pca9450-regulator.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Device Tree binding constants for the NXP PCA9450A/B/C PMIC regulators
+ */
+
+#ifndef _DT_BINDINGS_REGULATORS_NXP_PCA9450_H
+#define _DT_BINDINGS_REGULATORS_NXP_PCA9450_H
+
+/*
+ * Buck mode constants which may be used in devicetree properties (eg.
+ * regulator-initial-mode, regulator-allowed-modes).
+ * See the manufacturer's datasheet for more information on these modes.
+ */
+
+#define PCA9450_BUCK_MODE_AUTO		0
+#define PCA9450_BUCK_MODE_FORCE_PWM	1
+
+#endif