Documentation/devicetree/bindings/eeprom/at25.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/eeprom/at25.yaml

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/eeprom/at25.yaml
Extension
.yaml
Size
4152 bytes
Lines
160
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/eeprom/at25.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: SPI EEPROMs or FRAMs compatible with Atmel's AT25

maintainers:
  - Christian Eggers <ceggers@arri.de>

properties:
  $nodename:
    anyOf:
      - pattern: "^eeprom@[0-9a-f]{1,2}$"
      - pattern: "^fram@[0-9a-f]{1,2}$"

  # There are multiple known vendors who manufacture EEPROM chips compatible
  # with Atmel's AT25. The compatible string requires two items where the
  # 'vendor' and 'model' parts of the first are the actual chip and the second
  # item is fixed to "atmel,at25". Some existing bindings only have the
  # "atmel,at25" part and should be fixed by somebody who knows vendor and
  # product.
  compatible:
    oneOf:
      - items:
          - enum:
              - anvo,anv32c81w
              - anvo,anv32e61w
              - atmel,at25256B
              - fujitsu,mb85rs1mt
              - fujitsu,mb85rs256
              - fujitsu,mb85rs64
              - microchip,25aa010a
              - microchip,at25160bn
              - microchip,25lc040
              - st,m95m02
              - st,m95256
              - st,m95640
              - cypress,fm25

          - const: atmel,at25

      # Please don't use this alternative for new bindings.
      - items:
          - const: atmel,at25

  reg:
    maxItems: 1

  pagesize:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [1, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072]
    description:
      Size of the eeprom page. FRAMs don't have pages.

  size:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      Total eeprom size in bytes.
      Also used for FRAMs without device ID where the size cannot be detected.

  address-width:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [ 8, 9, 16, 24 ]
    description:
      Number of address bits.
      For 9 bits, the MSB of the address is sent as bit 3 of the instruction
      byte, before the address byte.

Annotation

Implementation Notes