xref: /freebsd-src/sys/contrib/device-tree/Bindings/mtd/nand-controller.yaml (revision aa1a8ff2d6dbc51ef058f46f3db5a8bb77967145)

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

title: NAND Controller Common Properties

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

description: |
  The NAND controller should be represented with its own DT node, and
  all NAND chips attached to this controller should be defined as
  children nodes of the NAND controller. This representation should be
  enforced even for simple controllers supporting only one chip.

properties:
  $nodename:
    pattern: "^nand-controller(@.*)?"

  "#address-cells":
    const: 1

  "#size-cells":
    const: 0

  ranges: true

  cs-gpios:
    description:
      Array of chip-select available to the controller. The first
      entries are a 1:1 mapping of the available chip-select on the
      NAND controller (even if they are not used). As many additional
      chip-select as needed may follow and should be phandles of GPIO
      lines. 'reg' entries of the NAND chip subnodes become indexes of
      this array when this property is present.
    minItems: 1
    maxItems: 8

patternProperties:
  "^nand@[a-f0-9]$":
    type: object
    $ref: raw-nand-chip.yaml#

required:
  - "#address-cells"
  - "#size-cells"

# This is a generic file other binding inherit from and extend
additionalProperties: true

examples:
  - |
    nand-controller {
      #address-cells = <1>;
      #size-cells = <0>;
      cs-gpios = <0>, <&gpioA 1>; /* A single native CS is available */

      /* controller specific properties */

      nand@0 {
        reg = <0>; /* Native CS */
        /* NAND chip specific properties */
      };

      nand@1 {
        reg = <1>; /* GPIO CS */
      };
    };