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

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr3-timings.yaml

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr3-timings.yaml
Extension
.yaml
Size
4110 bytes
Lines
158
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.

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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,lpddr3-timings.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: LPDDR3 SDRAM AC timing parameters for a given speed-bin

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

properties:
  compatible:
    const: jedec,lpddr3-timings

  reg:
    maxItems: 1
    description: |
      Maximum DDR clock frequency for the speed-bin, in Hz.
      Property is deprecated, use max-freq.
    deprecated: true

  max-freq:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Maximum DDR clock frequency for the speed-bin, in Hz.

  min-freq:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Minimum DDR clock frequency for the speed-bin, in Hz.

  tCKE:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      CKE minimum pulse width (HIGH and LOW pulse width) in pico seconds.

  tCKESR:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      CKE minimum pulse width during SELF REFRESH (low pulse width during
      SELF REFRESH) in pico seconds.

  tFAW:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Four-bank activate window in pico seconds.

  tMRD:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Mode register set command delay in pico seconds.

  tR2R-C2C:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Additional READ-to-READ delay in chip-to-chip cases in pico seconds.

  tRAS:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Row active time in pico seconds.

  tRC:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      ACTIVATE-to-ACTIVATE command period in pico seconds.

  tRCD:
    $ref: /schemas/types.yaml#/definitions/uint32

Annotation

Implementation Notes