linux/Documentation/devicetree/bindings/memory-controllers/arm,pl35x-smc.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/arm,pl35x-smc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Arm PL35x Series Static Memory Controller (SMC)

maintainers:
  - Miquel Raynal <miquel.raynal@bootlin.com>

description: |
  The PL35x Static Memory Controller is a bus where you can connect two kinds
  of memory interfaces, which are NAND and memory mapped interfaces (such as
  SRAM or NOR) depending on the specific configuration.

  The TRM is available here:
  https://documentation-service.arm.com/static/5e8e2524fd977155116a58aa

# We need a select here so we don't match all nodes with 'arm,primecell'
select:
  properties:
    compatible:
      contains:
        enum:
          - arm,pl353-smc-r2p1
          - arm,pl354
  required:
    - compatible

properties:
  $nodename:
    pattern: "^memory-controller@[0-9a-f]+$"

  compatible:
    items:
      - enum:
          - arm,pl353-smc-r2p1
          - arm,pl354
      - const: arm,primecell

  "#address-cells":
    const: 2

  "#size-cells":
    const: 1

  reg:
    items:
      - description:
          Configuration registers for the host and sub-controllers.
          The three chip select regions are defined in 'ranges'.

  clocks:
    minItems: 1
    maxItems: 2

  clock-names:
    minItems: 1
    maxItems: 2

  ranges:
    minItems: 1
    maxItems: 8

  interrupts:
    minItems: 1
    items:
      - description: Combined or Memory interface 0 IRQ
      - description: Memory interface 1 IRQ

patternProperties:
  "@[0-7],[a-f0-9]+$":
    type: object
    additionalProperties: true
    description: |
      The child device node represents the controller connected to the SMC
      bus. The controller can be a NAND controller or a pair of any memory
      mapped controllers such as NOR and SRAM controllers.

    properties:
      compatible:
        description:
          Compatible of memory controller.

      reg:
        items:
          - items:
              - description: |
                  Chip-select ID, as in the parent range property.
                minimum: 0
                maximum: 7
              - description: |
                  Offset of the memory region requested by the device.
              - description: |
                  Length of the memory region requested by the device.

    required:
      - compatible
      - reg

required:
  - compatible
  - reg
  - clock-names
  - clocks

additionalProperties: false

allOf:
  - if:
      properties:
        compatible:
          contains:
            const: arm,pl354
    then:
      properties:
        clocks:
          # According to TRM, really should be 3 clocks
          maxItems: 1

        clock-names:
          const: apb_pclk

    else:
      properties:
        clocks:
          items:
            - description: clock for the memory device bus
            - description: main clock of the SMC

        clock-names:
          items:
            - const: memclk
            - const: apb_pclk

examples:
  - |
    smcc: memory-controller@e000e000 {
      compatible = "arm,pl353-smc-r2p1", "arm,primecell";
      reg = <0xe000e000 0x0001000>;
      clock-names = "memclk", "apb_pclk";
      clocks = <&clkc 11>, <&clkc 44>;
      ranges = <0x0 0x0 0xe1000000 0x1000000 /* Nand CS region */
                0x1 0x0 0xe2000000 0x2000000 /* SRAM/NOR CS0 region */
                0x2 0x0 0xe4000000 0x2000000>; /* SRAM/NOR CS1 region */
      #address-cells = <2>;
      #size-cells = <1>;

      nfc0: nand-controller@0,0 {
        compatible = "arm,pl353-nand-r2p1";
        reg = <0 0 0x1000000>;
        #address-cells = <1>;
        #size-cells = <0>;
      };
    };