xref: /openbmc/linux/Documentation/devicetree/bindings/spi/spi-pl022.yaml (revision 3d21a46093352f7802b9c66c7cce35cd02a50e53)

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/spi/spi-pl022.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: ARM PL022 SPI controller

maintainers:
  - Linus Walleij <linus.walleij@linaro.org>

allOf:
  - $ref: "spi-controller.yaml#"

# We need a select here so we don't match all nodes with 'arm,primecell'
select:
  properties:
    compatible:
      contains:
        const: arm,pl022
  required:
    - compatible

properties:
  compatible:
    items:
      - const: arm,pl022
      - const: arm,primecell

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clocks:
    maxItems: 2

  clock-names:
    items:
      - enum:
          - SSPCLK
          - sspclk
      - const: apb_pclk

  pl022,autosuspend-delay:
    description: delay in ms following transfer completion before the
      runtime power management system suspends the device. A setting of 0
      indicates no delay and the device will be suspended immediately.
    $ref: "/schemas/types.yaml#/definitions/uint32"

  pl022,rt:
    description: indicates the controller should run the message pump with realtime
      priority to minimise the transfer latency on the bus (boolean)
    type: boolean

  dmas:
    description:
      Two or more DMA channel specifiers following the convention outlined
      in bindings/dma/dma.txt
    minItems: 2
    maxItems: 32

  dma-names:
    description:
      There must be at least one channel named "tx" for transmit and named "rx"
      for receive.
    minItems: 2
    maxItems: 32
    additionalItems: true
    items:
      - const: rx
      - const: tx

patternProperties:
  "^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
    type: object
    # SPI slave nodes must be children of the SPI master node and can
    # contain the following properties.
    properties:
      pl022,interface:
        description: SPI interface type
        $ref: "/schemas/types.yaml#/definitions/uint32"
        enum:
          - 0      # SPI
          - 1      # Texas Instruments Synchronous Serial Frame Format
          - 2      # Microwire (Half Duplex)

      pl022,com-mode:
        description: Specifies the transfer mode
        $ref: "/schemas/types.yaml#/definitions/uint32"
        enum:
          - 0      # interrupt mode
          - 1      # polling mode
          - 2      # DMA mode
        default: 1

      pl022,rx-level-trig:
        description: Rx FIFO watermark level
        $ref: "/schemas/types.yaml#/definitions/uint32"
        minimum: 0
        maximum: 4

      pl022,tx-level-trig:
        description: Tx FIFO watermark level
        $ref: "/schemas/types.yaml#/definitions/uint32"
        minimum: 0
        maximum: 4

      pl022,ctrl-len:
        description: Microwire interface - Control length
        $ref: "/schemas/types.yaml#/definitions/uint32"
        minimum: 0x03
        maximum: 0x1f

      pl022,wait-state:
        description: Microwire interface - Wait state
        $ref: "/schemas/types.yaml#/definitions/uint32"
        enum: [0, 1]

      pl022,duplex:
        description: Microwire interface - Full/Half duplex
        $ref: "/schemas/types.yaml#/definitions/uint32"
        enum: [0, 1]

required:
  - compatible
  - reg
  - interrupts

examples:
  - |
    spi@e0100000 {
      compatible = "arm,pl022", "arm,primecell";
      reg = <0xe0100000 0x1000>;
      #address-cells = <1>;
      #size-cells = <0>;
      interrupts = <0 31 0x4>;
      dmas = <&dma_controller 23 1>,
        <&dma_controller 24 0>;
      dma-names = "rx", "tx";

      m25p80@1 {
        compatible = "st,m25p80";
        reg = <1>;
        spi-max-frequency = <12000000>;
        spi-cpol;
        spi-cpha;
        pl022,interface = <0>;
        pl022,com-mode = <0x2>;
        pl022,rx-level-trig = <0>;
        pl022,tx-level-trig = <0>;
        pl022,ctrl-len = <0x11>;
        pl022,wait-state = <0>;
        pl022,duplex = <0>;
      };
    };
...