dts/bindings/pinctrl/renesas,rzt2m-pinctrl.yaml

# Copyright (c) 2023 Antmicro <www.antmicro.com>
# SPDX-License-Identifier: Apache-2.0

description: |
    The Renesas RZ/T2M pin controller is a node responsible for controlling
    pin function selection and pin properties, such as routing the TX and RX of UART0
    to pin 5 and pin 6 of port 16.

    The node has the 'pinctrl' node label set in your SoC's devicetree,
    so you can modify it like this:

      &pinctrl {
              /* your modifications go here */
      };

    All device pin configurations should be placed in child nodes of the
    'pinctrl' node, as shown in this example:

      /* You can put this in places like a board-pinctrl.dtsi file in
       * your board directory, or a devicetree overlay in your application.
       */

      /* include pre-defined combinations for the SoC variant used by the board */
      #include <dt-bindings/pinctrl/renesas-rzt2m-pinctrl.h>

      &pinctrl {
        uart0_default: uart0_default {
          group1 {
            pinmux = <UART0TX_P16_5>;
          };
          group2 {
            pinmux = <UART0RX_P16_6>;
            input-enable;
          };
        };
      };

    The 'uart0_default' child node encodes the pin configurations for a
    particular state of a device; in this case, the default (that is, active)
    state.

    As shown, pin configurations are organized in groups within each child node.
    Each group can specify a list of pin function selections in the 'pinmux'
    property.

    A group can also specify shared pin properties common to all the specified
    pins, such as the 'input-enable' property in group 2.

compatible: "renesas,rzt2m-pinctrl"

include: base.yaml

child-binding:
  description: |
    Definitions for a pinctrl state.
  child-binding:

    include:
      - name: pincfg-node.yaml
        property-allowlist:
          - input-enable
          - bias-pull-up
          - bias-pull-down
          - bias-high-impedance
          - input-schmitt-enable

    properties:
      pinmux:
        required: true
        type: array
        description: |
          An array of pins sharing the same group properties. Each
          element of the array is an integer constructed from the
          pin number and the alternative function of the pin.
      drive-strength:
        type: string
        enum:
          - "low"
          - "middle"
          - "high"
          - "ultrahigh"
        default: "low"
        description: |
          The drive strength of a pin, relative to full-driver strength.
          The default value is "low", which is the reset value.
      slew-rate:
        type: string
        enum:
          - "slow"
          - "fast"
        default: "slow"
        description: |
          Select slew rate for a pin. The default is slow, which is the reset value.