Documentation/devicetree/bindings/pinctrl/mediatek,mt6795-pinctrl.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/pinctrl/mediatek,mt6795-pinctrl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: MediaTek MT6795 Pin Controller

maintainers:
  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
  - Sean Wang <sean.wang@kernel.org>

description:
  The MediaTek's MT6795 Pin controller is used to control SoC pins.

properties:
  compatible:
    const: mediatek,mt6795-pinctrl

  gpio-controller: true

  '#gpio-cells':
    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.
    const: 2

  gpio-ranges:
    description: GPIO valid number range.
    maxItems: 1

  reg:
    description:
      Physical address base for GPIO base and eint registers.
    minItems: 2

  reg-names:
    items:
      - const: base
      - const: eint

  interrupt-controller: true

  '#interrupt-cells':
    const: 2

  interrupts:
    description: Interrupt outputs to the system interrupt controller (sysirq).
    minItems: 1
    items:
      - description: EINT interrupt
      - description: EINT event_b interrupt

# PIN CONFIGURATION NODES
patternProperties:
  '-pins$':
    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.
          An example of using macro:
          pincontroller {
            /* GPIO0 set as multifunction GPIO0 */
            gpio-pins {
              pins {
                pinmux = <PINMUX_GPIO0__FUNC_GPIO0>;
              }
            };
            /* GPIO45 set as multifunction SDA0 */
            i2c0-pins {
              pins {
                pinmux = <PINMUX_GPIO45__FUNC_SDA0>;
              }
            };
          };
        $ref: pinmux-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 dt-bindings/pinctrl/<soc>-pinfunc.h directly.

          drive-strength:
            enum: [2, 4, 6, 8, 10, 12, 14, 16]

          bias-pull-down:
            oneOf:
              - type: boolean
              - enum: [100, 101, 102, 103]
                description: mt6795 pull down PUPD/R0/R1 type define value.
            description:
              For normal pull down type, it is not necessary to specify R1R0
              values; When pull down type is PUPD/R0/R1, adding R1R0 defines
              will set different resistance values.

          bias-pull-up:
            oneOf:
              - type: boolean
              - enum: [100, 101, 102, 103]
                description: mt6795 pull up PUPD/R0/R1 type define value.
            description:
              For normal pull up type, it is not necessary to specify R1R0
              values; When pull up type is PUPD/R0/R1, adding R1R0 defines will
              set different resistance values.

          bias-disable: true

          output-high: true

          output-low: true

          input-enable: true

          input-disable: true

          input-schmitt-enable: true

          input-schmitt-disable: true

          mediatek,pull-up-adv:
            description: |
              Pull up 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,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]

        required:
          - pinmux

allOf:
  - $ref: pinctrl.yaml#

required:
  - compatible
  - reg
  - reg-names
  - interrupts
  - interrupt-controller
  - '#interrupt-cells'
  - gpio-controller
  - '#gpio-cells'
  - gpio-ranges

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/pinctrl/mt6795-pinfunc.h>

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

        pio: pinctrl@10005000 {
            compatible = "mediatek,mt6795-pinctrl";
            reg = <0 0x10005000 0 0x1000>, <0 0x1000b000 0 0x1000>;
            reg-names = "base", "eint";
            gpio-controller;
            #gpio-cells = <2>;
            gpio-ranges = <&pio 0 0 196>;
            interrupt-controller;
            interrupts = <GIC_SPI 153 IRQ_TYPE_LEVEL_HIGH>;
            #interrupt-cells = <2>;

            i2c0-pins {
                pins-sda-scl {
                    pinmux = <PINMUX_GPIO45__FUNC_SDA0>,
                             <PINMUX_GPIO46__FUNC_SCL0>;
                };
            };

            mmc0-pins {
                pins-cmd-dat {
                    pinmux = <PINMUX_GPIO154__FUNC_MSDC0_DAT0>,
                             <PINMUX_GPIO155__FUNC_MSDC0_DAT1>,
                             <PINMUX_GPIO156__FUNC_MSDC0_DAT2>,
                             <PINMUX_GPIO157__FUNC_MSDC0_DAT3>,
                             <PINMUX_GPIO158__FUNC_MSDC0_DAT4>,
                             <PINMUX_GPIO159__FUNC_MSDC0_DAT5>,
                             <PINMUX_GPIO160__FUNC_MSDC0_DAT6>,
                             <PINMUX_GPIO161__FUNC_MSDC0_DAT7>,
                             <PINMUX_GPIO162__FUNC_MSDC0_CMD>;
                    input-enable;
                    bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
                };

                pins-clk {
                    pinmux = <PINMUX_GPIO163__FUNC_MSDC0_CLK>;
                    bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
                };

                pins-rst {
                    pinmux = <PINMUX_GPIO165__FUNC_MSDC0_RSTB>;
                    bias-pull-up = <MTK_PUPD_SET_R1R0_10>;
                };
            };
        };
    };