dt-bindings: pwm: marvell,pxa-pwm: Add SpacemiT K3 PWM support

The PWM controller in SpacemiT K3 SoC reuse the same IP as previous K1
generation, while the difference is that one additional bus clock is
added.

Signed-off-by: Yixun Lan <dlan@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260428-03-k3-pwm-drv-v2-1-a532bbe45556@kernel.org
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

Documentation/devicetree/bindings/pwm/marvell,pxa-pwm.yaml

@@ -15,7 +15,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: spacemit,k1-pwm
+            enum:
+              - spacemit,k1-pwm
+              - spacemit,k3-pwm
     then:
       properties:
         "#pwm-cells":
@@ -26,6 +28,26 @@ allOf:
           const: 1
           description: |
             Used for specifying the period length in nanoseconds.
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - spacemit,k3-pwm
+    then:
+      required:
+        - clock-names
+      properties:
+        clocks:
+          minItems: 2
+        clock-names:
+          minItems: 2
+    else:
+      properties:
+        clocks:
+          maxItems: 1
+        clock-names:
+          maxItems: 1
 
 properties:
   compatible:
@@ -36,7 +58,9 @@ properties:
           - marvell,pxa168-pwm
           - marvell,pxa910-pwm
       - items:
-          - const: spacemit,k1-pwm
+          - enum:
+              - spacemit,k1-pwm
+              - spacemit,k3-pwm
           - const: marvell,pxa910-pwm
 
   reg:
@@ -47,7 +71,18 @@ properties:
     description: Number of cells in a pwm specifier.
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    items:
+      - description: The function clock
+      - description: An optional bus clock
+
+  clock-names:
+    minItems: 1
+    maxItems: 2
+    oneOf:
+      - items:
+          - const: func
+          - const: bus
 
   resets:
     maxItems: 1