NXP LPC32xx Motor Control PWM has an interrupt line shared with TIMER4,
and the interrupt may be used to report events from programmable counters
e.g. timer counter limit (period), match counter (pulse-width), or from
counters on input lines of PWM channels.

As a reference and for more details see NXP LPC32xx User Manual, table 595.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
---
 .../devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml       | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml b/Documentation/devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml
index cdd83ac29caf..53520f005acb 100644
--- a/Documentation/devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml
+++ b/Documentation/devicetree/bindings/pwm/nxp,lpc3220-pwm.yaml

@@ -32,6 +32,16 @@ required:
 
 allOf:
   - $ref: pwm.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - nxp,lpc3220-motor-pwm
+    then:
+      properties:
+        interrupts:
+          maxItems: 1
 
 unevaluatedProperties: false
 

-- 
2.43.0