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Date: Tue, 30 Aug 2022 18:33:56 -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 1/4] 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.)
This also un-deprecates the manufacturer ID property for LPDDR3 (and
introduces it to LPDDR2), since it was found that having this
information available in a separate property can be useful in some
cases.
Signed-off-by: Julius Werner <jwerner@...omium.org>
---
.../ddr/jedec,lpddr-props.yaml | 60 +++++++++++++++++++
.../memory-controllers/ddr/jedec,lpddr2.yaml | 40 ++-----------
.../memory-controllers/ddr/jedec,lpddr3.yaml | 39 ++----------
3 files changed, 68 insertions(+), 71 deletions(-)
create mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml
diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml
new file mode 100644
index 00000000000000..8b31c60ea2435b
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml
@@ -0,0 +1,60 @@
+# 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 <krzk@...nel.org>
+
+properties:
+ manufacturer-id:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Manufacturer ID read from Mode Register 5.
+ minimum: 0
+ maximum: 255
+
+ 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. 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:
+ - 32
+ - 16
+ - 8
+
+additionalProperties: true
diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
index 9d78f140609b6c..63c47235cb9896 100644
--- a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
@@ -6,6 +6,9 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
title: LPDDR2 SDRAM compliant to JEDEC JESD209-2
+allOf:
+ - $ref: "jedec,lpddr-props.yaml#"
+
maintainers:
- Krzysztof Kozlowski <krzk@...nel.org>
@@ -41,41 +44,6 @@ properties:
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
maximum: 16
@@ -168,7 +136,7 @@ required:
- density
- io-width
-additionalProperties: false
+unevaluatedProperties: false
examples:
- |
diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr3.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr3.yaml
index 48908a19473c3f..5969166cdc9e0f 100644
--- a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr3.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr3.yaml
@@ -6,6 +6,9 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
title: LPDDR3 SDRAM compliant to JEDEC JESD209-3
+allOf:
+ - $ref: "jedec,lpddr-props.yaml#"
+
maintainers:
- Krzysztof Kozlowski <krzk@...nel.org>
@@ -20,40 +23,6 @@ properties:
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
deprecated: true
@@ -206,7 +175,7 @@ required:
- density
- io-width
-additionalProperties: false
+unevaluatedProperties: false
examples:
- |
--
2.31.0
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