linux-loongson/Documentation/devicetree/bindings/memory-controllers/arm,pl172.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/arm,pl172.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: ARM PL172/PL175/PL176 MultiPort Memory Controller

maintainers:
  - Frank Li <Frank.Li@nxp.com>

# We need a select here so we don't match all nodes with 'arm,primecell'
select:
  properties:
    compatible:
      contains:
        enum:
          - arm,pl172
          - arm,pl175
          - arm,pl176
  required:
    - compatible

properties:
  compatible:
    items:
      - enum:
          - arm,pl172
          - arm,pl175
          - arm,pl176
      - const: arm,primecell

  reg:
    maxItems: 1

  '#address-cells':
    const: 2

  '#size-cells':
    const: 1

  ranges: true

  clocks:
    maxItems: 2

  clock-names:
    items:
      - const: mpmcclk
      - const: apb_pclk

  clock-ranges: true

  resets:
    maxItems: 1

patternProperties:
  "^cs[0-9]$":
    type: object
    additionalProperties: false
    patternProperties:
      "^flash@[0-9],[0-9a-f]+$":
        type: object
        $ref: /schemas/mtd/mtd-physmap.yaml#
        unevaluatedProperties: false

      "^(gpio|sram)@[0-9],[0-9a-f]+$":
        type: object
        additionalProperties: true

    properties:
      '#address-cells':
        const: 2

      '#size-cells':
        const: 1

      ranges: true

      clocks:
        maxItems: 2

      clock-ranges: true

      mpmc,cs:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Chip select number. Indicates to the pl0172 driver
          which chipselect is used for accessing the memory.

      mpmc,memory-width:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [8, 16, 32]
        description:
          Width of the chip select memory. Must be equal to either 8, 16 or 32.

      mpmc,async-page-mode:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          Enable asynchronous page mode.

      mpmc,cs-active-high:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          Set chip select polarity to active high.

      mpmc,byte-lane-low:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          Set byte lane state to low.

      mpmc,extended-wait:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          Enable extended wait.

      mpmc,buffer-enable:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          Enable write buffer, option is not supported by
          PL175 and PL176 controllers.

      mpmc,write-protect:
        $ref: /schemas/types.yaml#/definitions/flag
        description:
          Enable write protect.

      mpmc,read-enable-delay:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Delay from chip select assertion to read
          enable (RE signal) in nano seconds.

      mpmc,write-enable-delay:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Delay from chip select assertion to write
          enable (WE signal) in nano seconds.

      mpmc,output-enable-delay:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Delay from chip select assertion to output
          enable (OE signal) in nano seconds.

      mpmc,write-access-delay:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Delay from chip select assertion to write
          access in nano seconds.

      mpmc,read-access-delay:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Delay from chip select assertion to read
          access in nano seconds.

      mpmc,page-mode-read-delay:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Delay for asynchronous page mode sequential
          accesses in nano seconds.

      mpmc,turn-round-delay:
        $ref: /schemas/types.yaml#/definitions/uint32
        description:
          Delay between access to memory banks in nano
          seconds.

required:
  - compatible
  - reg
  - '#address-cells'
  - '#size-cells'
  - ranges
  - clocks
  - clock-names

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/lpc18xx-ccu.h>

    memory-controller@40005000 {
        compatible = "arm,pl172", "arm,primecell";
        reg = <0x40005000 0x1000>;
        clocks = <&ccu1 CLK_CPU_EMCDIV>, <&ccu1 CLK_CPU_EMC>;
        clock-names = "mpmcclk", "apb_pclk";
        #address-cells = <2>;
        #size-cells = <1>;
        ranges = <0 0 0x1c000000 0x1000000
                  1 0 0x1d000000 0x1000000
                  2 0 0x1e000000 0x1000000
                  3 0 0x1f000000 0x1000000>;

        cs0 {
            #address-cells = <2>;
            #size-cells = <1>;
            ranges;

            mpmc,cs = <0>;
            mpmc,memory-width = <16>;
            mpmc,byte-lane-low;
            mpmc,write-enable-delay = <0>;
            mpmc,output-enable-delay = <0>;
            mpmc,read-enable-delay = <70>;
            mpmc,page-mode-read-delay = <70>;

            flash@0,0 {
                compatible = "sst,sst39vf320", "cfi-flash";
                reg = <0 0 0x400000>;
                bank-width = <2>;
                #address-cells = <1>;
                #size-cells = <1>;
                partition@0 {
                    label = "data";
                    reg = <0 0x400000>;
                };
            };
        };
    };