linux-kernel - Re: [PATCH v3 4/4] dt-bindings: firmware: arm,scmi: Add support for pinctrl protocol

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Message-ID: <20230614223640.GA2980828-robh@kernel.org>
Date:   Wed, 14 Jun 2023 16:36:40 -0600
From:   Rob Herring <robh@...nel.org>
To:     Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>
Cc:     "sudeep.holla@....com" <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v3 4/4] dt-bindings: firmware: arm,scmi: Add support for
 pinctrl protocol

On Tue, Jun 06, 2023 at 04:22:28PM +0000, Oleksii Moisieiev wrote:
> Add new SCMI v3.2 pinctrl protocol bindings definitions and example.
> 
> Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@...m.com>
> ---
>  .../bindings/firmware/arm,scmi.yaml           | 53 +++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> index 5824c43e9893..a19aa184bbd1 100644
> --- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> +++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> @@ -233,6 +233,39 @@ properties:
>        reg:
>          const: 0x18
>  
> +  protocol@19:
> +    $ref: '#/$defs/protocol-node'

       unevaluatedProperties: false

> +
> +    properties:
> +      reg:
> +        const: 0x19
> +
> +      '#pinctrl-cells':
> +        const: 0
> +
> +    allOf:
> +      - $ref: /schemas/pinctrl/pinctrl.yaml#

Group this and the '#/$defs/protocol-node' $ref under allOf.

> +
> +    required:
> +      - reg
> +
> +    additionalProperties:
> +      anyOf:

Don't need anyOf with only 1 entry.

But the use of additionalProperties is usually for existing cases where 
the pin config nodes had no naming convention. For new bindings, define 
a node name pattern (under patternProperties). I'd suggest '-pins$' as 
used elsewhere.

> +        - type: object
> +          allOf:
> +            - $ref: /schemas/pinctrl/pincfg-node.yaml#
> +            - $ref: /schemas/pinctrl/pinmux-node.yaml#
> +
> +          description:
> +            A pin multiplexing sub-node describe how to configure a
> +            set of pins is some desired function.
> +            A single sub-node may define several pin configurations.
> +            This sub-node is using default pinctrl bindings to configure
> +            pin multiplexing and using SCMI protocol to apply specified
> +            configuration using SCMI protocol.
> +
> +          unevaluatedProperties: false
> +
>  additionalProperties: false
>  
>  $defs:
> @@ -384,6 +417,26 @@ examples:
>              scmi_powercap: protocol@18 {
>                  reg = <0x18>;
>              };
> +
> +            scmi_pinctrl: protocol@19 {
> +                reg = <0x19>;
> +                #pinctrl-cells = <0>;
> +
> +                i2c2 {
> +                    groups = "i2c2_a", "i2c2_b";
> +                    function = "i2c2";
> +                };
> +
> +                pins_mdio {
> +                    groups = "avb_mdio";
> +                    drive-strength = <24>;
> +                };
> +
> +                keys_pins: keys {
> +                    pins = "GP_5_17", "GP_5_20", "GP_5_22", "GP_2_1";
> +                    bias-pull-up;
> +                };
> +            };
>          };
>      };
>  
> -- 
> 2.25.1