dt-bindings: clock: r9a06g032-sysctrl: Reference the DMAMUX subnode

This system controller contains several registers that have nothing to
do with the clock handling, like the DMA mux register. Describe this
part of the system controller as a subnode.
Signed-off-by: NMiquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Acked-by: NStephen Boyd <sboyd@kernel.org>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220427095653.91804-3-miquel.raynal@bootlin.comSigned-off-by: NVinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/clock/renesas,r9a06g032-sysctrl.yaml

@@ -39,6 +39,17 @@ properties:
   '#power-domain-cells':
     const: 0
 
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 1
+
+patternProperties:
+  "^dma-router@[a-f0-9]+$":
+    type: object
+    $ref: "../dma/renesas,rzn1-dmamux.yaml#"
+
 required:
   - compatible
   - reg