linux-kernel - Re: [PATCH v3 1/2] dt-bindings: net: dsa: add new mdio property

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Date:   Thu, 24 Feb 2022 14:11:55 -0600
From:   Rob Herring <robh@...nel.org>
To:     Luiz Angelo Daros de Luca <luizluca@...il.com>
Cc:     devicetree@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Olof Johansson <olof@...om.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: net: dsa: add new mdio property

On Mon, Feb 21, 2022 at 05:01:02PM -0300, Luiz Angelo Daros de Luca wrote:
> The optional mdio property will be used by dsa switch to configure
> slave_mii_bus when the driver does not allocate it during setup.
> 
> Some drivers already offer/require a similar property but, in some
> cases, they rely on a compatible string to identify the mdio bus node.

That case will fail with this change. It precludes any binding 
referencing dsa.yaml from defining a 'mdio' node with properties other 
than what mdio.yaml defines.

The rule is becoming any common schema should not define more than one 
level of nodes if those levels can be extended.

> Each subdriver might decide to keep existing approach or migrate to this
> new common property.
> 
> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
> ---
>  Documentation/devicetree/bindings/net/dsa/dsa.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.yaml b/Documentation/devicetree/bindings/net/dsa/dsa.yaml
> index b9d48e357e77..f9aa09052785 100644
> --- a/Documentation/devicetree/bindings/net/dsa/dsa.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/dsa.yaml
> @@ -32,6 +32,12 @@ properties:
>        (single device hanging off a CPU port) must not specify this property
>      $ref: /schemas/types.yaml#/definitions/uint32-array
>  
> +  mdio:
> +    unevaluatedProperties: false
> +    description:
> +      Container of PHY and devices on the switches MDIO bus.
> +    $ref: /schemas/net/mdio.yaml#
> +
>  patternProperties:
>    "^(ethernet-)?ports$":
>      type: object
> -- 
> 2.35.1
> 
>