diff --git a/dts/bindings/pwm/atmel,sam0-tcc-pwm.yaml b/dts/bindings/pwm/atmel,sam0-tcc-pwm.yaml
index 367461422ba..e8bae3e6983 100644
--- a/dts/bindings/pwm/atmel,sam0-tcc-pwm.yaml
+++ b/dts/bindings/pwm/atmel,sam0-tcc-pwm.yaml
@@ -59,7 +59,8 @@ properties:
       - 1024
 
   "#pwm-cells":
-    const: 1
+    const: 2
 
 pwm-cells:
   - channel
+  - period