diff --git a/arch/arm/boot/dts/stm32mp157c.dtsi b/arch/arm/boot/dts/stm32mp157c.dtsi
index b27aff04dc6d..c21dd9f31503 100644
--- a/arch/arm/boot/dts/stm32mp157c.dtsi
+++ b/arch/arm/boot/dts/stm32mp157c.dtsi
@@ -139,6 +139,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -167,6 +168,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -193,6 +195,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -221,6 +224,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -278,6 +282,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -299,6 +304,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -320,6 +326,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -573,6 +580,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -603,6 +611,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -676,6 +685,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 
@@ -700,6 +710,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};
 			timer@15 {
@@ -723,6 +734,7 @@
 
 			pwm {
 				compatible = "st,stm32-pwm";
+				#pwm-cells = <3>;
 				status = "disabled";
 			};