Documentation/devicetree/bindings/spi/spi-sifive.yaml

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

title: SiFive SPI controller

maintainers:
  - Pragnesh Patel <pragnesh.patel@sifive.com>
  - Paul Walmsley  <paul.walmsley@sifive.com>
  - Palmer Dabbelt <palmer@sifive.com>

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

properties:
  compatible:
    items:
      - enum:
          - sifive,fu540-c000-spi
          - sifive,fu740-c000-spi
      - const: sifive,spi0

    description:
      Should be "sifive,<chip>-spi" and "sifive,spi<version>".
      Supported compatible strings are -
      "sifive,fu540-c000-spi" and "sifive,fu740-c000-spi" for the SiFive SPI v0
      as integrated onto the SiFive FU540 and FU740 chip resp, and "sifive,spi0"
      for the SiFive SPI v0 IP block with no chip integration tweaks.
      Please refer to sifive-blocks-ip-versioning.txt for details

      SPI RTL that corresponds to the IP block version numbers can be found here -
      https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/spi

  reg:
    minItems: 1
    items:
      - description: SPI registers region
      - description: Memory mapped flash region

  interrupts:
    maxItems: 1

  clocks:
    maxItems: 1

    description:
      Must reference the frequency given to the controller

  sifive,fifo-depth:
    description:
      Depth of hardware queues; defaults to 8
    $ref: "/schemas/types.yaml#/definitions/uint32"
    enum: [8]
    default: 8

  sifive,max-bits-per-word:
    description:
      Maximum bits per word; defaults to 8
    $ref: "/schemas/types.yaml#/definitions/uint32"
    enum: [0, 1, 2, 3, 4, 5, 6, 7, 8]
    default: 8

required:
  - compatible
  - reg
  - interrupts
  - clocks

unevaluatedProperties: false

examples:
  - |
    spi: spi@10040000 {
      compatible = "sifive,fu540-c000-spi", "sifive,spi0";
      reg = <0x10040000 0x1000>, <0x20000000 0x10000000>;
      interrupt-parent = <&plic>;
      interrupts = <51>;
      clocks = <&tlclk>;
      #address-cells = <1>;
      #size-cells = <0>;
      sifive,fifo-depth = <8>;
      sifive,max-bits-per-word = <8>;
    };

...