dt-bindings: pinctrl: mt8192: add binding document

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/pinctrl/pinctrl-mt8192.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Mediatek MT8192 Pin Controller

maintainers:

  - Sean Wang <sean.wang@mediatek.com>

description: |

  The Mediatek's Pin controller is used to control SoC pins.

properties:

  compatible:

    const: mediatek,mt8192-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 registers. There are 11 GPIO

      physical address base in mt8192.

    maxItems: 11

  reg-names:

    description: |

      Gpio base register names.

    maxItems: 11

  interrupt-controller: true

  '#interrupt-cells':

    const: 2

  interrupts:

    description: The interrupt outputs to sysirq.

    maxItems: 1

#PIN CONFIGURATION NODES

patternProperties:

  '^pins':

    type: object

    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 */

        state_0_node_a {

          pinmux = <PINMUX_GPIO0__FUNC_GPIO0>;

        };

        /* GPIO1 set as multifunction PWM */

        state_0_node_b {

          pinmux = <PINMUX_GPIO1__FUNC_PWM_1>;

        };

      };

    $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:

        description: |

          It can support some arguments, such as MTK_DRIVE_4mA, MTK_DRIVE_6mA, etc. See

          dt-bindings/pinctrl/mt65xx.h. It can only support 2/4/6/8/10/12/14/16mA in mt8192.

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

      bias-pull-down: true

      bias-pull-up: true

      bias-disable: true

      output-high: true

      output-low: true

      input-enable: true

      input-disable: true

      input-schmitt-enable: true

      input-schmitt-disable: true

    required:

      - pinmux

    additionalProperties:  false

required:

  - compatible

  - reg

  - interrupts

  - interrupt-controller

  - '#interrupt-cells'

  - gpio-controller

  - '#gpio-cells'

  - gpio-ranges

additionalProperties: false

examples:

  - |

            #include <dt-bindings/pinctrl/mt8192-pinfunc.h>

            #include <dt-bindings/interrupt-controller/arm-gic.h>

            pio: pinctrl@10005000 {

                    compatible = "mediatek,mt8192-pinctrl";

                    reg = <0x10005000 0x1000>,

                          <0x11c20000 0x1000>,

                          <0x11d10000 0x1000>,

                          <0x11d30000 0x1000>,

                          <0x11d40000 0x1000>,

                          <0x11e20000 0x1000>,

                          <0x11e70000 0x1000>,

                          <0x11ea0000 0x1000>,

                          <0x11f20000 0x1000>,

                          <0x11f30000 0x1000>,

                          <0x1000b000 0x1000>;

                    reg-names = "iocfg0", "iocfg_rm", "iocfg_bm",

                          "iocfg_bl", "iocfg_br", "iocfg_lm",

                          "iocfg_lb", "iocfg_rt", "iocfg_lt",

                          "iocfg_tl", "eint";

                    gpio-controller;

                    #gpio-cells = <2>;

                    gpio-ranges = <&pio 0 0 220>;

                    interrupt-controller;

                    interrupts = <GIC_SPI 212 IRQ_TYPE_LEVEL_HIGH 0>;

                    #interrupt-cells = <2>;

                    pins {

                      pinmux = <PINMUX_GPIO0__FUNC_GPIO0>;

                      output-low;

                    };

            };