dt-bindings: memory: Factor out common properties of LPDDR bindings

The bindings for different LPDDR versions mostly use the same kinds of
properties, so in order to reduce duplication when we're adding support
for more versions, this patch creates a new lpddr-props subschema that
can be referenced by the others to define these common parts. (This will
consider a few smaller I/O width and density numbers "legal" for LPDDR3
that are usually not used there, but this should be harmless.)

Signed-off-by: Julius Werner <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

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

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr-props.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Common properties for LPDDR types
+
+description:
+  Different LPDDR types generally use the same properties and only differ in the
+  range of legal values for each. This file defines the common parts that can be
+  reused for each type.
+
+maintainers:
+  - Krzysztof Kozlowski <[e-mail]>
+
+properties:
+  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>).
+    maxItems: 2
+    items:
+      minimum: 0
+      maximum: 255
+
+  density:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Density in megabits of SDRAM chip. Decoded from Mode Register 8.
+    enum:
+      - 64
+      - 128
+      - 256
+      - 512
+      - 1024
+      - 2048
+      - 4096
+      - 8192
+      - 16384
+      - 32768
+
+  io-width:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      IO bus width in bits of SDRAM chip. Decoded from Mode Register 8.
+    enum:
+      - 8
+      - 16
+      - 32
+
+additionalProperties: true

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

···
 maintainers:
   - Krzysztof Kozlowski <[e-mail]>
 
+allOf:
+  - $ref: jedec,lpddr-props.yaml#
+
 properties:
   compatible:
     oneOf:
···
       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
-    description: |
-      Density in megabits of SDRAM chip. Obtained from device datasheet.
-    enum:
-      - 64
-      - 128
-      - 256
-      - 512
-      - 1024
-      - 2048
-      - 4096
-      - 8192
-      - 16384
-      - 32768
-
-  io-width:
-    $ref: /schemas/types.yaml#/definitions/uint32
-    description: |
-      IO bus width in bits of SDRAM chip. Obtained from device datasheet.
-    enum:
-      - 32
-      - 16
-      - 8
 
   tRRD-min-tck:
     $ref: /schemas/types.yaml#/definitions/uint32
···
   - density
   - io-width
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |

Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr3.yaml

···
 maintainers:
   - Krzysztof Kozlowski <[e-mail]>
 
+allOf:
+  - $ref: jedec,lpddr-props.yaml#
+
 properties:
   compatible:
     items:
···
     const: 1
     deprecated: true
 
-  density:
-    $ref: /schemas/types.yaml#/definitions/uint32
-    description: |
-      Density in megabits of SDRAM chip.
-    enum:
-      - 4096
-      - 8192
-      - 16384
-      - 32768
-
-  io-width:
-    $ref: /schemas/types.yaml#/definitions/uint32
-    description: |
-      IO bus width in bits of SDRAM chip.
-    enum:
-      - 32
-      - 16
-
   manufacturer-id:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: |
       Manufacturer ID value read from Mode Register 5.  The property is
       deprecated, manufacturer should be derived from the compatible.
     deprecated: true
-
-  revision-id:
-    $ref: /schemas/types.yaml#/definitions/uint32-array
-    minItems: 2
-    maxItems: 2
-    items:
-      maximum: 255
-    description: |
-      Revision value of SDRAM chip read from Mode Registers 6 and 7.
 
   '#size-cells':
     const: 0
···
   - density
   - io-width
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |