Documentation/devicetree/bindings/pinctrl/mediatek,mt6797-pinctrl.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/pinctrl/mediatek,mt6797-pinctrl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Mediatek MT6797 Pin Controller Device Tree Bindings

maintainers:
  - Sean Wang <sean.wang@kernel.org>

description: |+
  The MediaTek's MT6797 Pin controller is used to control SoC pins.

properties:
  compatible:
    const: mediatek,mt6797-pinctrl

  reg:
    minItems: 5
    maxItems: 5

  reg-names:
    items:
      - const: gpio
      - const: iocfgl
      - const: iocfgb
      - const: iocfgr
      - const: iocfgt

  gpio-controller: true

  "#gpio-cells":
    const: 2
    description: |
      Number of cells in GPIO specifier. Since the generic GPIO
      binding is used, the amount of cells must be specified as 2. See the below
      mentioned gpio binding representation for description of particular cells.

  interrupt-controller: true

  interrupts:
    maxItems: 1

  "#interrupt-cells":
    const: 2

required:
  - compatible
  - reg
  - reg-names
  - gpio-controller
  - "#gpio-cells"

patternProperties:
  '-[0-9]+$':
    type: object
    additionalProperties: false
    patternProperties:
      'pins':
        type: object
        additionalProperties: false
        description: |
          A pinctrl node should contain at least one subnodes representing the
          pinctrl groups available on the machine. Each subnode will list the
          pins it needs, and how they should be configured, with regard to muxer
          configuration, pullups, drive strength, input enable/disable and input
          schmitt.
        $ref: "/schemas/pinctrl/pincfg-node.yaml"

        properties:
          pinmux:
            description:
              integer array, represents gpio pin number and mux setting.
              Supported pin number and mux varies for different SoCs, and are
              defined as macros in <soc>-pinfunc.h directly.

          bias-disable: true

          bias-pull-up: true

          bias-pull-down: true

          input-enable: true

          input-disable: true

          output-enable: true

          output-low: true

          output-high: true

          input-schmitt-enable: true

          input-schmitt-disable: true

          drive-strength:
            enum: [2, 4, 8, 12, 16]

          slew-rate:
            enum: [0, 1]

          mediatek,pull-up-adv:
            description: |
              Pull up setings for 2 pull resistors, R0 and R1. User can
              configure those special pins. Valid arguments are described as below:
              0: (R1, R0) = (0, 0) which means R1 disabled and R0 disabled.
              1: (R1, R0) = (0, 1) which means R1 disabled and R0 enabled.
              2: (R1, R0) = (1, 0) which means R1 enabled and R0 disabled.
              3: (R1, R0) = (1, 1) which means R1 enabled and R0 enabled.
            $ref: /schemas/types.yaml#/definitions/uint32
            enum: [0, 1, 2, 3]

          mediatek,pull-down-adv:
            description: |
              Pull down settings for 2 pull resistors, R0 and R1. User can
              configure those special pins. Valid arguments are described as below:
              0: (R1, R0) = (0, 0) which means R1 disabled and R0 disabled.
              1: (R1, R0) = (0, 1) which means R1 disabled and R0 enabled.
              2: (R1, R0) = (1, 0) which means R1 enabled and R0 disabled.
              3: (R1, R0) = (1, 1) which means R1 enabled and R0 enabled.
            $ref: /schemas/types.yaml#/definitions/uint32
            enum: [0, 1, 2, 3]

          mediatek,tdsel:
            description: |
              An integer describing the steps for output level shifter duty
              cycle when asserted (high pulse width adjustment). Valid arguments
              are from 0 to 15.
            $ref: /schemas/types.yaml#/definitions/uint32

          mediatek,rdsel:
            description: |
              An integer describing the steps for input level shifter duty cycle
              when asserted (high pulse width adjustment). Valid arguments are
              from 0 to 63.
            $ref: /schemas/types.yaml#/definitions/uint32

        required:
          - pinmux

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/pinctrl/mt6797-pinfunc.h>

    soc {
        #address-cells = <2>;
        #size-cells = <2>;

        pio: pinctrl@10005000 {
            compatible = "mediatek,mt6797-pinctrl";
            reg = <0 0x10005000 0 0x1000>,
                  <0 0x10002000 0 0x400>,
                  <0 0x10002400 0 0x400>,
                  <0 0x10002800 0 0x400>,
                  <0 0x10002C00 0 0x400>;
            reg-names = "gpio", "iocfgl", "iocfgb", "iocfgr", "iocfgt";
            gpio-controller;
            #gpio-cells = <2>;

            uart_pins_a: uart-0 {
                pins1 {
                    pinmux = <MT6797_GPIO232__FUNC_URXD1>,
                            <MT6797_GPIO233__FUNC_UTXD1>;
                };
            };
        };
    };