xref: /openbmc/linux/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml (revision 686fe63b)

# 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@kernel.org>

properties:
  compatible:
    description:
      Compatible strings can be either explicit vendor names and part numbers
      (e.g. elpida,ECB240ABACN), or generated strings of the form
      lpddrX-YY,ZZZZ where X is the LPDDR version, YY is the manufacturer ID
      (from MR5) and ZZZZ is the revision ID (from MR6 and MR7). Both IDs are
      formatted in lower case hexadecimal representation with leading zeroes.
      The latter form can be useful when LPDDR nodes are created at runtime by
      boot firmware that doesn't have access to static part number information.

  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>).
    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:
      - 8
      - 16
      - 32

additionalProperties: true