linux-kernel - [PATCH 3/4 v2] dt-bindings: memory: Add jedec,lpddr4 and jedec,lpddr5 bindings

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Message-Id: <20220907232914.243502-3-jwerner@chromium.org>
Date:   Wed,  7 Sep 2022 16:29:13 -0700
From:   Julius Werner <jwerner@...omium.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Dmitry Osipenko <digetx@...il.com>,
        Doug Anderson <dianders@...omium.org>,
        Jian-Jia Su <jjsu@...gle.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Julius Werner <jwerner@...omium.org>
Subject: [PATCH 3/4 v2] dt-bindings: memory: Add jedec,lpddr4 and jedec,lpddr5 bindings

This patch adds bindings for LPDDR4 and LPDDR5 memory analogous to the
existing bindings for LPDDR2 and LPDDR3. For now, the new types are only
needed for topology description, so other properties like timing
parameters are omitted. They can be added later if needed.

Signed-off-by: Julius Werner <jwerner@...omium.org>
---
 .../ddr/jedec,lpddr-props.yaml                |  4 ++
 .../memory-controllers/ddr/jedec,lpddr4.yaml  | 36 ++++++++++++++
 .../memory-controllers/ddr/jedec,lpddr5.yaml  | 47 +++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr4.yaml
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr5.yaml

Changelog:

- v2
  - removed minItems
  - moved `$ref` below `maintainers`
  - renamed example node from `lpddr4` to `lpddr`

diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml
index 4114cfa8de67f1..92ef660888f318 100644
--- a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml
@@ -45,9 +45,13 @@ properties:
       - 512
       - 1024
       - 2048
+      - 3072
       - 4096
+      - 6144
       - 8192
+      - 12288
       - 16384
+      - 24576
       - 32768
 
   io-width:
diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr4.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr4.yaml
new file mode 100644
index 00000000000000..0b2394c032797f
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr4.yaml
@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr4.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LPDDR4 SDRAM compliant to JEDEC JESD209-4
+
+maintainers:
+  - Krzysztof Kozlowski <krzk@...nel.org>
+
+allOf:
+  - $ref: "jedec,lpddr-props.yaml#"
+
+properties:
+  compatible:
+    items:
+      - pattern: "^lpddr4-[0-9a-f]{2},[0-9a-f]{4}$"
+      - const: jedec,lpddr4
+
+required:
+  - compatible
+  - density
+  - io-width
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    lpddr {
+        compatible = "lpddr4-ff,0100", "jedec,lpddr4";
+        density = <8192>;
+        io-width = <16>;
+        manufacturer-id = <255>;
+        revision-id = <1 0>;
+    };
diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr5.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr5.yaml
new file mode 100644
index 00000000000000..d86e1e30380e47
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr5.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr5.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LPDDR5 SDRAM compliant to JEDEC JESD209-5
+
+maintainers:
+  - Krzysztof Kozlowski <krzk@...nel.org>
+
+allOf:
+  - $ref: "jedec,lpddr-props.yaml#"
+
+properties:
+  compatible:
+    items:
+      - pattern: "^lpddr5-[0-9a-f]{2},[0-9a-f]{4}$"
+      - const: jedec,lpddr5
+
+  serial-id:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      Serial IDs read from Mode Registers 47 through 54. One byte per uint32
+      cell (i.e. <MR47 MR48 MR49 MR50 MR51 MR52 MR53 MR54>).
+    maxItems: 8
+    items:
+      minimum: 0
+      maximum: 255
+
+required:
+  - compatible
+  - density
+  - io-width
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    lpddr {
+        compatible = "lpddr5-01,0200", "jedec,lpddr5";
+        density = <8192>;
+        io-width = <8>;
+        manufacturer-id = <1>;
+        revision-id = <2 0>;
+        serial-id = <3 1 0 0 0 0 0 0>;
+    };
-- 
2.31.0