dt-bindings: pinctrl: Add MediaTek MT6795 pinctrl bindings

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/pinctrl/mediatek,pinctrl-mt6795.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 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: The interrupt outputs to sysirq.

    maxItems: 1

# 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 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]

        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>;

                };

            };

        };

    };