dt-bindings: memory-controller: Define fallback compatible

All of the DDR controllers beyond revision b.2.1 have had a consistent
layout, therefore define a "brcm,brcmstb-memc-ddr-rev-b.2.1" fallback
compatible string to match them all rather than having to continuously
add to the list.

Link: https://lore.kernel.org/all/[e-mail]/
Signed-off-by: Florian Fainelli <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

Documentation/devicetree/bindings/memory-controllers/brcm,brcmstb-memc-ddr.yaml

···
 
 properties:
   compatible:
-    items:
-      - enum:
-          - brcm,brcmstb-memc-ddr-rev-b.1.x
-          - brcm,brcmstb-memc-ddr-rev-b.2.0
-          - brcm,brcmstb-memc-ddr-rev-b.2.1
-          - brcm,brcmstb-memc-ddr-rev-b.2.2
-          - brcm,brcmstb-memc-ddr-rev-b.2.3
-          - brcm,brcmstb-memc-ddr-rev-b.2.5
-          - brcm,brcmstb-memc-ddr-rev-b.2.6
-          - brcm,brcmstb-memc-ddr-rev-b.2.7
-          - brcm,brcmstb-memc-ddr-rev-b.2.8
-          - brcm,brcmstb-memc-ddr-rev-b.3.0
-          - brcm,brcmstb-memc-ddr-rev-b.3.1
-          - brcm,brcmstb-memc-ddr-rev-c.1.0
-          - brcm,brcmstb-memc-ddr-rev-c.1.1
-          - brcm,brcmstb-memc-ddr-rev-c.1.2
-          - brcm,brcmstb-memc-ddr-rev-c.1.3
-          - brcm,brcmstb-memc-ddr-rev-c.1.4
-      - const: brcm,brcmstb-memc-ddr
+    oneOf:
+      - description: Revision > 2.1 controllers
+        items:
+          - enum:
+              - brcm,brcmstb-memc-ddr-rev-b.2.2
+              - brcm,brcmstb-memc-ddr-rev-b.2.3
+              - brcm,brcmstb-memc-ddr-rev-b.2.5
+              - brcm,brcmstb-memc-ddr-rev-b.2.6
+              - brcm,brcmstb-memc-ddr-rev-b.2.7
+              - brcm,brcmstb-memc-ddr-rev-b.2.8
+              - brcm,brcmstb-memc-ddr-rev-b.3.0
+              - brcm,brcmstb-memc-ddr-rev-b.3.1
+              - brcm,brcmstb-memc-ddr-rev-c.1.0
+              - brcm,brcmstb-memc-ddr-rev-c.1.1
+              - brcm,brcmstb-memc-ddr-rev-c.1.2
+              - brcm,brcmstb-memc-ddr-rev-c.1.3
+              - brcm,brcmstb-memc-ddr-rev-c.1.4
+          - const: brcm,brcmstb-memc-ddr-rev-b.2.1
+          - const: brcm,brcmstb-memc-ddr
+      - description: Revision 2.1 controllers
+        items:
+          - const: brcm,brcmstb-memc-ddr-rev-b.2.1
+          - const: brcm,brcmstb-memc-ddr
+      - description: Revision 2.0 controllers
+        items:
+          - const: brcm,brcmstb-memc-ddr-rev-b.2.0
+          - const: brcm,brcmstb-memc-ddr
+      - description: Revision 1.x controllers
+        items:
+          - const: brcm,brcmstb-memc-ddr-rev-b.1.x
+          - const: brcm,brcmstb-memc-ddr
 
   reg:
     maxItems: 1
···
 examples:
   - |
     memory-controller@9902000 {
-        compatible = "brcm,brcmstb-memc-ddr-rev-c.1.1", "brcm,brcmstb-memc-ddr";
+        compatible = "brcm,brcmstb-memc-ddr-rev-c.1.1",
+                     "brcm,brcmstb-memc-ddr-rev-b.2.1",
+                     "brcm,brcmstb-memc-ddr";
         reg = <0x9902000 0x600>;
         clock-frequency = <2133000000>;
     };