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

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2.yaml
Extension
.yaml
Size
5918 bytes
Lines
205
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr2.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: LPDDR2 SDRAM compliant to JEDEC JESD209-2

maintainers:
  - Krzysztof Kozlowski <krzk@kernel.org>

allOf:
  - $ref: jedec,sdram-props.yaml#

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - elpida,ECB240ABACN
              - elpida,B8132B2PB-6D-F
          - enum:
              - jedec,lpddr2-nvm
              - jedec,lpddr2-s2
              - jedec,lpddr2-s4
      - items:
          - pattern: "^lpddr2-[0-9a-f]{2},[0-9a-f]{4}$"
          - enum:
              - jedec,lpddr2-nvm
              - jedec,lpddr2-s2
              - jedec,lpddr2-s4

  revision-id1:
    $ref: /schemas/types.yaml#/definitions/uint32
    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

  tRRD-min-tck:
    $ref: /schemas/types.yaml#/definitions/uint32
    maximum: 16
    description: |
      Active bank a to active bank b in terms of number of clock cycles.
      Obtained from device datasheet.

  tWTR-min-tck:
    $ref: /schemas/types.yaml#/definitions/uint32
    maximum: 16
    description: |
      Internal WRITE-to-READ command delay in terms of number of clock cycles.
      Obtained from device datasheet.

  tXP-min-tck:
    $ref: /schemas/types.yaml#/definitions/uint32
    maximum: 16
    description: |
      Exit power-down to next valid command delay in terms of number of clock
      cycles. Obtained from device datasheet.

  tRTP-min-tck:

Annotation

Implementation Notes