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:
      - const: sifive,fu540-c000-spi
      - const: sifive,spi0

    description:
      Should be "sifive,<chip>-spi" and "sifive,spi<version>".
      Supported compatible strings are -
      "sifive,fu540-c000-spi" for the SiFive SPI v0 as integrated
      onto the SiFive FU540 chip, 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

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>;
    };

...