dt-bindings: pinctrl: add binding for Ralink MT7621 pinctrl

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/pinctrl/ralink,mt7621-pinctrl.yaml#

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

title: Ralink MT7621 Pin Controller

maintainers:

  - Arınç ÜNAL <arinc.unal@arinc9.com>

  - Sergio Paracuellos <sergio.paracuellos@gmail.com>

description:

  Ralink MT7621 pin controller for MT7621 SoC.

  The pin controller can only set the muxing of pin groups. Muxing individual

  pins is not supported. There is no pinconf support.

properties:

  compatible:

    const: ralink,mt7621-pinctrl

patternProperties:

  '-pins$':

    type: object

    patternProperties:

      '^(.*-)?pinmux$':

        type: object

        description: node for pinctrl.

        $ref: pinmux-node.yaml#

        properties:

          groups:

            description: The pin group to select.

            enum: [i2c, jtag, mdio, pcie, rgmii1, rgmii2, sdhci, spi, uart1,

                   uart2, uart3, wdt]

          function:

            description: The mux function to select.

            enum: [gpio, i2c, i2s, jtag, mdio, nand1, nand2, pcie refclk,

                   pcie rst, pcm, rgmii1, rgmii2, sdhci, spdif2, spdif3, spi,

                   uart1, uart2, uart3, wdt refclk, wdt rst]

        required:

          - groups

          - function

        additionalProperties: false

    additionalProperties: false

allOf:

  - $ref: "pinctrl.yaml#"

required:

  - compatible

additionalProperties: false

examples:

  # Pinmux controller node

  - |

    pinctrl {

      compatible = "ralink,mt7621-pinctrl";

      i2c_pins: i2c0-pins {

        pinmux {

          groups = "i2c";

          function = "i2c";

        };

      };

    };