dt-bindings: memory: lpddr2: Adjust revision ID property to match lpddr3

Commit 3539a2c6c6 ("dt-bindings: memory: lpddr2: Add revision-id
properties") added the properties `revision-id1` and `revision-id2` to
the "jedec,lpddr2" binding. The "jedec,lpddr3" binding already had a
single array property `revision-id` for the same purpose. For
consistency between related memory types, this patch deprecates the
LPDDR2 properties and instead adds a property in the same style as for
LPDDR3 to that binding.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220224003421.3440124-2-jwerner@chromium.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml

@@ -30,12 +30,26 @@ properties:
     maximum: 255
     description: |
       Revision 1 value of SDRAM chip. Obtained from device datasheet.
+      Property is deprecated, use revision-id instead.
+    deprecated: true
 
   revision-id2:
     $ref: /schemas/types.yaml#/definitions/uint32
     maximum: 255
     description: |
       Revision 2 value of SDRAM chip. Obtained from device datasheet.
+      Property is deprecated, use revision-id instead.
+    deprecated: true
+
+  revision-id:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description: |
+      Revision IDs read from Mode Register 6 and 7. One byte per uint32 cell (i.e. <MR6 MR7>).
+    minItems: 2
+    maxItems: 2
+    items:
+      minimum: 0
+      maximum: 255
 
   density:
     $ref: /schemas/types.yaml#/definitions/uint32
@@ -162,8 +176,7 @@ examples:
         compatible = "elpida,ECB240ABACN", "jedec,lpddr2-s4";
         density = <2048>;
         io-width = <32>;
-        revision-id1 = <1>;
-        revision-id2 = <0>;
+        revision-id = <1 0>;
 
         tRPab-min-tck = <3>;
         tRCD-min-tck = <3>;