xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/pinctrl/renesas,rza1-ports.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/pinctrl/renesas,rza1-ports.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Renesas RZ/A1 combined Pin and GPIO controller

maintainers:
  - Jacopo Mondi <jacopo+renesas@jmondi.org>
  - Geert Uytterhoeven <geert+renesas@glider.be>

description:
  The Renesas SoCs of the RZ/A1 family feature a combined Pin and GPIO
  controller, named "Ports" in the hardware reference manual.
  Pin multiplexing and GPIO configuration is performed on a per-pin basis
  writing configuration values to per-port register sets.
  Each "port" features up to 16 pins, each of them configurable for GPIO
  function (port mode) or in alternate function mode.
  Up to 8 different alternate function modes exist for each single pin.

properties:
  compatible:
    oneOf:
      - const: renesas,r7s72100-ports     # RZ/A1H
      - items:
          - const: renesas,r7s72101-ports # RZ/A1M
          - const: renesas,r7s72100-ports # fallback
      - const: renesas,r7s72102-ports     # RZ/A1L

  reg:
    maxItems: 1

required:
  - compatible
  - reg

patternProperties:
  "^gpio-[0-9]*$":
    type: object

    description:
      Each port of the r7s72100 pin controller hardware is itself a GPIO
      controller.
      Different SoCs have different numbers of available pins per port, but
      generally speaking, each of them can be configured in GPIO ("port") mode
      on this hardware.
      Describe GPIO controllers using sub-nodes with the following properties.

    properties:
      gpio-controller: true

      '#gpio-cells':
        const: 2

      gpio-ranges:
        maxItems: 1

    required:
      - gpio-controller
      - '#gpio-cells'
      - gpio-ranges


additionalProperties:
  anyOf:
    - type: object
      allOf:
        - $ref: pincfg-node.yaml#
        - $ref: pinmux-node.yaml#

      description:
        A pin multiplexing sub-node describes how to configure a set of (or a
        single) pin in some desired alternate function mode.
        A single sub-node may define several pin configurations.
        A few alternate function require special pin configuration flags to be
        supplied along with the alternate function configuration number.
        The hardware reference manual specifies when a pin function requires
        "software IO driven" mode to be specified. To do so use the generic
        properties from the <include/linux/pinctrl/pinconf_generic.h> header
        file to instruct the pin controller to perform the desired pin
        configuration operation.
        The hardware reference manual specifies when a pin has to be configured
        to work in bi-directional mode and when the IO direction has to be
        specified by software. Bi-directional pins must be managed by the pin
        controller driver internally, while software driven IO direction has to
        be explicitly selected when multiple options are available.

      properties:
        pinmux:
          description: |
            Integer array representing pin number and pin multiplexing
            configuration.
            When a pin has to be configured in alternate function mode, use
            this property to identify the pin by its global index, and provide
            its alternate function configuration number along with it.
            When multiple pins are required to be configured as part of the
            same alternate function they shall be specified as members of the
            same argument list of a single "pinmux" property.
            Helper macros to ease assembling the pin index from its position
            (port where it sits on and pin number) and alternate function
            identifier are provided by the pin controller header file at:
            <include/dt-bindings/pinctrl/r7s72100-pinctrl.h>
            Integers values in "pinmux" argument list are assembled as:
            ((PORT * 16 + PIN) | MUX_FUNC << 16)

        phandle: true
        input-enable: true
        output-enable: true

      required:
        - pinmux

      additionalProperties: false

    - type: object
      properties:
        phandle: true

      additionalProperties:
        $ref: "#/additionalProperties/anyOf/0"

examples:
  - |
    #include <dt-bindings/pinctrl/r7s72100-pinctrl.h>
    pinctrl: pinctrl@fcfe3000 {
            compatible = "renesas,r7s72100-ports";

            reg = <0xfcfe3000 0x4230>;

            /*
             * A GPIO controller node, controlling 16 pins indexed from 0.
             * The GPIO controller base in the global pin indexing space is pin
             * 48, thus pins [0 - 15] on this controller map to pins [48 - 63]
             * in the global pin indexing space.
             */
            port3: gpio-3 {
                    gpio-controller;
                    #gpio-cells = <2>;
                    gpio-ranges = <&pinctrl 0 48 16>;
            };

            /*
             * A serial communication interface with a TX output pin and an RX
             * input pin.
             * Pin #0 on port #3 is configured as alternate function #6.
             * Pin #2 on port #3 is configured as alternate function #4.
             */
            scif2_pins: serial2 {
                    pinmux = <RZA1_PINMUX(3, 0, 6)>, <RZA1_PINMUX(3, 2, 4)>;
            };


            /*
             * I2c master: both SDA and SCL pins need bi-directional operations
             * Pin #4 on port #1 is configured as alternate function #1.
             * Pin #5 on port #1 is configured as alternate function #1.
             * Both need to work in bi-directional mode, the driver must manage
             * this internally.
             */
            i2c2_pins: i2c2 {
                    pinmux = <RZA1_PINMUX(1, 4, 1)>, <RZA1_PINMUX(1, 5, 1)>;
            };


            /*
             * Multi-function timer input and output compare pins.
             */
            tioc0_pins: tioc0 {
                    /*
                     * Configure TIOC0A as software driven input
                     * Pin #0 on port #4 is configured as alternate function #2
                     * with IO direction specified by software as input.
                     */
                    tioc0_input_pins {
                            pinmux = <RZA1_PINMUX(4, 0, 2)>;
                            input-enable;
                    };

                    /*
                     * Configure TIOC0B as software driven output
                     * Pin #1 on port #4 is configured as alternate function #1
                     * with IO direction specified by software as output.
                     */
                    tioc0_output_pins {
                            pinmux = <RZA1_PINMUX(4, 1, 1)>;
                            output-enable;
                    };
            };
    };