dts/bindings/pinctrl/nuvoton,npcx-pinctrl.yaml

# Copyright (c) 2022 Nuvoton Technology Corporation.
# SPDX-License-Identifier: Apache-2.0

description: |
  The Nuvoton pin controller is a singleton node responsible for controlling
  pin function selection and pin properties. For example, you can use these
  nodes to select peripheral pin functions.

  Here is a list of supported standard pin properties:
    - bias-pull-down: Enable pull-down resistor.
    - bias-pull-up: Enable pull-up resistor.
    - drive-open-drain: Output driver is open-drain.

  Custom pin properties for npcx series are available also:
    - pinmux-locked: Lock pinmux configuration for peripheral device
    - pinmux-gpio: Inverse pinmux back to gpio

  An example for NPCX7 family, include the chip level pinctrl DTSI file in the
  board level DTS:

    #include <nuvoton/npcx/npcx7/npcx7-pinctrl.dtsi>

  We want to use the I2C0_0 port of the NPCX7M6FB controller and enable the
  internal 3.3V pull-up if its i2c frequency won't exceed 400kHz.

  To change a pin's pinctrl default properties, add a reference to the
  pin in the board's DTS file and set the properties as below:

    &i2c0_0_sda_scl_gpb4_b5 {
      bias-pull-up; /* Enable internal pull-up for i2c0_0 */
      pinmux-locked; /* Lock pinmuxing */
    };

    &i2c0_0 {
      pinctrl-0 = <&i2c0_0_sda_scl_gpb4_b5>;
      pinctrl-names = "default";
    }

compatible: "nuvoton,npcx-pinctrl"

include:
    - name: base.yaml
    - name: pincfg-node.yaml
      child-binding:
        property-allowlist:
          - bias-pull-down
          - bias-pull-up
          - drive-open-drain

child-binding:
    description: |
      NPCX pin controller pin configuration nodes
    properties:
      pinmux:
        type: phandle
        required: false
        description: Configurations of pinmux selection
      periph-pupd:
        type: array
        required: false
        description: |
          A map to PUPD_ENn register/bit that enable pull-up/down of NPCX peripheral devices.
          Please don't overwrite this property in the board-level DT driver.
      pinmux-locked:
        required: false
        type: boolean
        description: Lock pinmux selection
      pinmux-gpio:
        required: false
        type: boolean
        description: Inverse pinmux selection to GPIO