dt-bindings: serial: snps-dw-apb-uart: document RZ/N1 binding without DMA

Renesas RZ/N1D has this UART with and without DMA support. Currently,
only the binding with DMA support is described. Add the missing one
without DMA support which can fallback even more.

Signed-off-by: Wolfram Sang <[email protected]>
Reviewed-by: Miquel Raynal <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Wolfram Sang

Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml

@@ -13,6 +13,20 @@ allOf:
   - $ref: serial.yaml#
   - $ref: rs485.yaml#
 
+  - if:
+      properties:
+        compatible:
+          items:
+            - enum:
+                - renesas,r9a06g032-uart
+                - renesas,r9a06g033-uart
+            - const: renesas,rzn1-uart
+            - const: snps,dw-apb-uart
+    then:
+      properties:
+        dmas: false
+        dma-names: false
+
   - if:
       properties:
         compatible:
@@ -30,6 +44,12 @@ allOf:
 properties:
   compatible:
     oneOf:
+      - items:
+          - enum:
+              - renesas,r9a06g032-uart
+              - renesas,r9a06g033-uart
+          - const: renesas,rzn1-uart
+          - const: snps,dw-apb-uart
       - items:
           - enum:
               - renesas,r9a06g032-uart