xref: /freebsd/sys/contrib/device-tree/Bindings/mtd/mtd.yaml (revision 7ef62cebc2f965b0f640263e179276928885e33d)

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/mtd/mtd.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: MTD (Memory Technology Device)

maintainers:
  - Miquel Raynal <miquel.raynal@bootlin.com>
  - Richard Weinberger <richard@nod.at>

properties:
  $nodename:
    pattern: "^flash(@.*)?$"

  label:
    description:
      User-defined MTD device name. Can be used to assign user friendly
      names to MTD devices (instead of the flash model or flash controller
      based name) in order to ease flash device identification and/or
      describe what they are used for.

patternProperties:
  "^otp(-[0-9]+)?$":
    type: object
    $ref: ../nvmem/nvmem.yaml#

    description: |
      An OTP memory region. Some flashes provide a one-time-programmable
      memory whose content can either be programmed by a user or is already
      pre-programmed by the factory. Some flashes might provide both.

    properties:
      compatible:
        enum:
          - user-otp
          - factory-otp

    required:
      - compatible

additionalProperties: true

examples:
  - |
    spi {
        #address-cells = <1>;
        #size-cells = <0>;

        flash@0 {
            reg = <0>;
            compatible = "jedec,spi-nor";
            label = "System-firmware";
        };
    };

  - |
    spi {
        #address-cells = <1>;
        #size-cells = <0>;

        flash@0 {
            reg = <0>;
            compatible = "jedec,spi-nor";

            otp-1 {
                compatible = "factory-otp";
                #address-cells = <1>;
                #size-cells = <1>;

                electronic-serial-number@0 {
                    reg = <0 8>;
                };
            };

            otp-2 {
                compatible = "user-otp";
                #address-cells = <1>;
                #size-cells = <1>;

                mac-address@0 {
                    reg = <0 6>;
                };
            };
        };
    };

...