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

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

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr2-timings.yaml
Extension
.yaml
Size
3446 bytes
Lines
136
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-timings.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: LPDDR2 SDRAM AC timing parameters for a given speed-bin

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

properties:
  compatible:
    const: jedec,lpddr2-timings

  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.

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

  tDQSCK-max:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      DQS output data access time from CK_t/CK_c in pico seconds.

  tDQSCK-max-derated:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      DQS output data access time from CK_t/CK_c, temperature de-rated, in pico
      seconds.

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

  tRAS-max-ns:
    description: |
      Row active time in nano seconds.

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

  tRCD:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      RAS-to-CAS delay in pico seconds.

  tRPab:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Row precharge time (all banks) in pico seconds.

  tRRD:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Active bank A to active bank B in pico seconds.

Annotation

Implementation Notes