dt-bindings: thermal: rcar-gen3-thermal: Add r8a779a0 support

Add support for R-Car V3U. The V3U IP differs a bit from its siblings in
such way that it have 4 TSC nodes and the interrupts are not routed to
the INTC-AP but to the ECM.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20201126223028.3119044-2-niklas.soderlund+renesas@ragnatech.se

Documentation/devicetree/bindings/thermal/rcar-gen3-thermal.yaml

@@ -26,13 +26,16 @@ properties:
       - renesas,r8a77961-thermal # R-Car M3-W+
       - renesas,r8a77965-thermal # R-Car M3-N
       - renesas,r8a77980-thermal # R-Car V3H
+      - renesas,r8a779a0-thermal # R-Car V3U
+
   reg:
     minItems: 2
-    maxItems: 3
+    maxItems: 4
     items:
       - description: TSC1 registers
       - description: TSC2 registers
       - description: TSC3 registers
+      - description: TSC4 registers
 
   interrupts:
     items:
@@ -55,12 +58,22 @@ properties:
 required:
   - compatible
   - reg
-  - interrupts
   - clocks
   - power-domains
   - resets
   - "#thermal-sensor-cells"
 
+if:
+  not:
+    properties:
+      compatible:
+        contains:
+          enum:
+            - renesas,r8a779a0-thermal
+then:
+  required:
+    - interrupts
+
 additionalProperties: false
 
 examples: