linux-kernel - [PATCH v3 1/3] dt-bindings: memory: lpddr2: Adjust revision ID property to match lpddr3

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Date:   Wed, 23 Feb 2022 16:34:19 -0800
From:   Julius Werner <jwerner@...omium.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Dmitry Osipenko <digetx@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Julius Werner <jwerner@...omium.org>
Subject: [PATCH v3 1/3] dt-bindings: memory: lpddr2: Adjust revision ID property to match lpddr3

Commit 3539a2 (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@...omium.org>
---
 .../memory-controllers/ddr/jedec,lpddr2.yaml    | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

Changelog:

- v2:
  - Updated commit message to fill in commit reference to earlier patch
- v3:
  - Added `items` specification with `minimum` and `maximum` values to
    `revision-id` binding
  - Updated binding example to preserve previous revision ID values

diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
index 25ed0266f6dd3d..e9d0936861b779 100644
--- a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
+++ b/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
@@ -164,8 +178,7 @@ 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>;
-- 
2.31.0