dt-bindings: thermal: rcar-thermal: Improve schema validation

- Factor out common required properties,
  - "interrupts", "clocks", and "power-domains" are required on R-Mobile
    APE6, too,
  - Invert logic to simplify descriptions.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20201028153541.1736279-1-geert+renesas@glider.be

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

@@ -62,25 +62,35 @@ properties:
   "#thermal-sensor-cells":
     const: 0
 
-if:
+required:
+  - compatible
+  - reg
+
+allOf:
+  - if:
+      not:
         properties:
           compatible:
             contains:
               enum:
                 - renesas,thermal-r8a73a4 # R-Mobile APE6
                 - renesas,thermal-r8a7779 # R-Car H1
-then:
+    then:
       required:
-    - compatible
-    - reg
-else:
+        - resets
+        - '#thermal-sensor-cells'
+
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: renesas,thermal-r8a7779 # R-Car H1
+    then:
       required:
-    - compatible
-    - reg
         - interrupts
         - clocks
         - power-domains
-    - resets
 
 additionalProperties: false