Re: [PATCH v2 1/2] dt-bindings: pinctrl: rt2880: add binding document

[Rob Herring <robh@xxxxxxxxxx>]

On Tue, Dec 08, 2020 at 08:55:22AM +0100, Sergio Paracuellos wrote:
> The commit adds rt2880 compatible node in binding document.
> 
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>
> ---
>  .../pinctrl/ralink,rt2880-pinmux.yaml         | 70 +++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/ralink,rt2880-pinmux.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/ralink,rt2880-pinmux.yaml b/Documentation/devicetree/bindings/pinctrl/ralink,rt2880-pinmux.yaml
> new file mode 100644
> index 000000000000..7dea3e26d99e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/ralink,rt2880-pinmux.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/ralink,rt2880-pinmux.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ralink rt2880 pinmux controller
> +
> +maintainers:
> +  - Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>
> +
> +description:
> +  The rt2880 pinmux can only set the muxing of pin groups. muxing indiviual pins
> +  is not supported. There is no pinconf support.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ralink,rt2880-pinmux

What's the control interface as you have no 'reg' property.

> +
> +  pinctrl-0:
> +    description:
> +      A phandle to the node containing the subnodes containing default
> +      configurations. This is for pinctrl hogs.
> +
> +  pinctrl-names:
> +    description:
> +      A pinctrl state named "default" can be defined.
> +    const: default

These 2 properties go in consumer nodes.

> +
> +required:
> +  - compatible
> +
> +patternProperties:
> +  '[a-z0-9_-]+':
> +    if:
> +      type: object
> +      description: node for pinctrl.
> +      $ref: "pinmux-node.yaml"
> +    then:

For new bindings, don't do this hack. Just name the nodes '-pins$'

> +      properties:
> +        groups:
> +          description: Name of the pin group to use for the functions.
> +          enum: [i2c, spi, uart1, uart2, uart3, rgmii1, rgmii2, mdio,
> +                 pcie, sdhci]
> +        function:
> +          description: The mux function to select
> +          enum: [gpio, i2c, spi, uart1, uart2, uart3, rgmii1, rgmii2,
> +                 mdio, nand1, nand2, sdhci]

         additionalProperties: false
     
> +
> +additionalProperties: false
> +
> +examples:
> +  # Pinmux controller node
> +  - |
> +    pinctrl {
> +      compatible = "ralink,rt2880-pinmux";
> +      pinctrl-names = "default";
> +      pinctrl-0 = <&state_default>;
> +
> +      state_default: pinctrl0 {
> +      };
> +
> +      i2c_pins: i2c0 {
> +        i2c0 {
> +          groups = "i2c";
> +          function = "i2c";
> +        };
> +      };
> +    };
> -- 
> 2.25.1
>