Subject: Re: [PATCH net-next v8 01/10] dt-bindings: net: airoha: Add GDM port ethernet child node

From: Lorenzo Bianconi <[email-masked]>
Date: Fri, 22 May 2026 21:27:07 +0200

> EN7581 and AN7583 SoCs support connecting multiple external SerDes to GDM3
> or GDM4 ports via a hw arbiter that manages the traffic in a TDM manner.
> As a result multiple net_devices can connect to the same GDM{3,4} port
> and there is a theoretical "1:n" relation between GDM ports and
> net_devices.
> Introduce the ethernet node child of a specific GDM port in order to model
> a given net_device that is connected via the external arbiter to the
> GDM{3,4} port. This new ethernet node is defined by the "airoha,eth-port"
> compatible string. Please note GDM1 and GDM2 does not support the
> connection with the external arbiter and they are represented by an
> ethernet node defined by the "airoha,eth-mac" compatible string.

Hi Rob, Krzysztof and Conor,

do you have any comment about this patch? Thanks in advance.

Regards,
Lorenzo

> 
> Signed-off-by: Lorenzo Bianconi <[email-masked]>
> ---
>  .../devicetree/bindings/net/airoha,en7581-eth.yaml | 56 +++++++++++++++++++++-
>  1 file changed, 55 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/airoha,en7581-eth.yaml b/Documentation/devicetree/bindings/net/airoha,en7581-eth.yaml
> index fbe2ddcdd909..17fe2edf4886 100644
> --- a/Documentation/devicetree/bindings/net/airoha,en7581-eth.yaml
> +++ b/Documentation/devicetree/bindings/net/airoha,en7581-eth.yaml
> @@ -130,6 +130,42 @@ patternProperties:
>          maximum: 4
>          description: GMAC port identifier
>  
> +    allOf:
> +      - if:
> +          properties:
> +            reg:
> +              contains:
> +                items:
> +                  - enum:
> +                      - 3
> +                      - 4
> +        then:
> +          properties:
> +            '#address-cells':
> +              const: 1
> +
> +            '#size-cells':
> +              const: 0
> +
> +          patternProperties:
> +            "^ethernet@[0-5]$":
> +              type: object
> +              unevaluatedProperties: false
> +              $ref: ethernet-controller.yaml#
> +              description: External ethernet port ID available on the GDM port
> +
> +              properties:
> +                compatible:
> +                  const: airoha,eth-port
> +
> +                reg:
> +                  maximum: 5
> +                  description: External ethernet port identifier
> +
> +              required:
> +                - reg
> +                - compatible
> +
>      required:
>        - reg
>        - compatible
> @@ -191,9 +227,27 @@ examples:
>          #address-cells = <1>;
>          #size-cells = <0>;
>  
> -        mac: ethernet@1 {
> +        ethernet@1 {
>            compatible = "airoha,eth-mac";
>            reg = <1>;
>          };
> +
> +        ethernet@4 {
> +          compatible = "airoha,eth-mac";
> +          reg = <4>;
> +
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +
> +          ethernet@0 {
> +            compatible = "airoha,eth-port";
> +            reg = <0>;
> +          };
> +
> +          ethernet@1 {
> +            compatible = "airoha,eth-port";
> +            reg = <1>;
> +          };
> +        };
>        };
>      };
> 
> -- 
> 2.54.0
>