aspeed,sgpio.yaml

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

title: Aspeed SGPIO controller

maintainers:
  - Andrew Jeffery <[e-mail]>

description:
  This SGPIO controller is for ASPEED AST2400, AST2500, AST2600 and AST2700 SoC,
  AST2700 have two sgpio master both with 256 pins,
  AST2600 have two sgpio master one with 128 pins another one with 80 pins,
  AST2500/AST2400 have one sgpio master with 80 pins. Each of the Serial
  GPIO pins can be programmed to support the following options
  - Support interrupt option for each input port and various interrupt
    sensitivity option (level-high, level-low, edge-high, edge-low)
  - Support reset tolerance option for each output port
  - Directly connected to APB bus and its shift clock is from APB bus clock
    divided by a programmable value.
  - Co-work with external signal-chained TTL components (74LV165/74LV595)

properties:
  compatible:
    enum:
      - aspeed,ast2400-sgpio
      - aspeed,ast2500-sgpio
      - aspeed,ast2600-sgpiom
      - aspeed,ast2700-sgpiom

  reg:
    maxItems: 1

  gpio-controller: true

  # Each SGPIO is represented as a pair of input and output GPIOs
  gpio-line-names:
    minItems: 160
    maxItems: 256

  '#gpio-cells':
    const: 2

  interrupts:
    maxItems: 1

  interrupt-controller: true

  '#interrupt-cells':
    const: 2

  clocks:
    maxItems: 1

  ngpios: true

  bus-frequency: true

required:
  - compatible
  - reg
  - gpio-controller
  - '#gpio-cells'
  - interrupts
  - interrupt-controller
  - '#interrupt-cells'
  - ngpios
  - clocks
  - bus-frequency

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/aspeed-clock.h>
    sgpio: sgpio@1e780200 {
        #gpio-cells = <2>;
        compatible = "aspeed,ast2500-sgpio";
        gpio-controller;
        interrupts = <40>;
        reg = <0x1e780200 0x0100>;
        clocks = <&syscon ASPEED_CLK_APB>;
        interrupt-controller;
        #interrupt-cells = <2>;
        ngpios = <80>;
        bus-frequency = <12000000>;
    };