linux-kernel - Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus

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Message-ID: <20230913110404.co7earmnbzf6hhoe@skbuf>
Date:   Wed, 13 Sep 2023 14:04:04 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Daniel Golle <daniel@...rotopia.org>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, mithat.guner@...ont.com,
        erkin.bozoglu@...ont.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus

On Wed, Sep 13, 2023 at 01:59:17PM +0300, Arınç ÜNAL wrote:
> If I understand correctly, these phylink rules are for switch ports. The
> fixed-link, phy-handle, and managed properties are described on
> ethernet-controller.yaml so I thought it would make sense to define the
> rules there and refer to them where they're needed.
> 
> Example:
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml b/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
> index 480120469953..7279ab31aea7 100644
> --- a/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
> @@ -65,16 +65,8 @@ if:
>      - required: [ ethernet ]
>      - required: [ link ]
>  then:
> -  allOf:
> -    - required:
> -        - phy-mode
> -    - oneOf:
> -        - required:
> -            - fixed-link
> -        - required:
> -            - phy-handle
> -        - required:
> -            - managed
> +  $ref: /schemas/net/ethernet-controller.yaml#/$defs/phylink-switch
> +  required: [ phy-mode ]
>  additionalProperties: true
> diff --git a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> index e532c6b795f4..742aaf1a5ef2 100644
> --- a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> @@ -179,6 +179,15 @@ required:
>    - compatible
>    - reg
> +if:
> +  required: [ mdio ]
> +then:
> +  patternProperties:
> +    "^(ethernet-)?ports$":
> +      patternProperties:
> +        "^(ethernet-)?port@[0-9]+$":
> +          $ref: /schemas/net/ethernet-controller.yaml#/$defs/phylink-switch
> +
>  $defs:
>    mt7530-dsa-port:
>      patternProperties:
> diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> index 9f6a5ccbcefe..d7256f33d946 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> @@ -284,6 +284,21 @@ allOf:
>              controllers that have configurable TX internal delays. If this
>              property is present then the MAC applies the TX delay.
> +$defs:
> +  phylink-switch:
> +    description: phylink bindings for switch ports
> +    allOf:
> +      - anyOf:
> +          - required: [ fixed-link ]
> +          - required: [ phy-handle ]
> +          - required: [ managed ]
> +
> +      - if:
> +          required: [ fixed-link ]
> +        then:
> +          not:
> +            required: [ managed ]
> +
>  additionalProperties: true
>  ...
> 
> Arınç

I don't think they're for switch ports only. Any driver which uses
phylink_fwnode_phy_connect() or its derivatives gets subject to the same
bindings. But putting the sub-schema in ethernet-controller.yaml makes
sense, just maybe not naming it "phylink-switch".