Subject: Re: [PATCH net-next v2 2/9] dt-bindings: net: lan9645x: add LAN9645X switch bindings

From: Rob Herring <[email-masked]>
Date: Tue, 7 Apr 2026 12:18:54 -0500

On Tue, Mar 24, 2026 at 11:46:45AM +0100, Jens Emil Schulz Østergaard wrote:
> Add bindings for LAN9645X switch. We use a fallback compatible for the
> smallest SKU microchip,lan96455s-switch.
> 
> Reviewed-by: Steen Hegelund <[email-masked]>
> Signed-off-by: Jens Emil Schulz Østergaard <[email-masked]>
> ---
> Changes in v2:
> - rename file to microchip,lan96455s-switch.yaml
> - remove led vendor property
> - add {rx,tx}-internal-delay-ps for rgmii delay
> - remove labels from example
> - remove container node from example
> ---
>  .../net/dsa/microchip,lan96455s-switch.yaml        | 119 +++++++++++++++++++++
>  MAINTAINERS                                        |   1 +
>  2 files changed, 120 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/microchip,lan96455s-switch.yaml b/Documentation/devicetree/bindings/net/dsa/microchip,lan96455s-switch.yaml
> new file mode 100644
> index 000000000000..0282e25c05d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/dsa/microchip,lan96455s-switch.yaml
> @@ -0,0 +1,119 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/dsa/microchip,lan96455s-switch.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip LAN9645x Ethernet switch
> +
> +maintainers:
> +  - Jens Emil Schulz Østergaard <[email-masked]>
> +
> +description: |

Don't need '|'

> +  The LAN9645x switch is a multi-port Gigabit AVB/TSN Ethernet switch with
> +  five integrated 10/100/1000Base-T PHYs. In addition to the integrated PHYs,
> +  it supports up to 2 RGMII/RMII, up to 2 BASE-X/SERDES/2.5GBASE-X and one
> +  Quad-SGMII interfaces.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - microchip,lan96455s-switch
> +      - items:
> +          - enum:
> +              - microchip,lan96455f-switch
> +              - microchip,lan96457f-switch
> +              - microchip,lan96459f-switch
> +              - microchip,lan96457s-switch
> +              - microchip,lan96459s-switch
> +          - const: microchip,lan96455s-switch
> +
> +  reg:
> +    maxItems: 1
> +
> +$ref: dsa.yaml#

Since you don't have any custom properties (just constraints), this ref 
should be "dsa.yaml#/$defs/ethernet-ports".

> +
> +patternProperties:
> +  "^(ethernet-)?ports$":

For a new binding, use the preferred name which is ethernet-ports. ports 
and port collide with the graph binding.

> +    type: object
> +    additionalProperties: true
> +    patternProperties:
> +      "^(ethernet-)?port@[0-8]$":

And 'ethernet-port'

> +        type: object
> +        description: Ethernet switch ports
> +
> +        $ref: dsa-port.yaml#
> +
> +        properties:
> +          rx-internal-delay-ps:
> +            const: 2000
> +
> +          tx-internal-delay-ps:
> +            const: 2000
> +
> +        unevaluatedProperties: false

Place this after the $ref.

> +
> +oneOf:
> +  - required:
> +      - ports
> +  - required:
> +      - ethernet-ports
> +
> +required:
> +  - compatible
> +  - reg
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    ethernet-switch@4000 {
> +        compatible = "microchip,lan96459f-switch", "microchip,lan96455s-switch";
> +        reg = <0x4000 0x244>;
> +
> +        ethernet-ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +                phy-mode = "gmii";
> +                phy-handle = <&cuphy0>;
> +            };
> +
> +            port@1 {
> +                reg = <1>;
> +                phy-mode = "gmii";
> +                phy-handle = <&cuphy1>;
> +            };
> +
> +            port@2 {
> +                reg = <2>;
> +                phy-mode = "gmii";
> +                phy-handle = <&cuphy2>;
> +            };
> +
> +            port@3 {
> +                reg = <3>;
> +                phy-mode = "gmii";
> +                phy-handle = <&cuphy3>;
> +            };
> +
> +            port@7 {
> +                reg = <7>;
> +                phy-mode = "rgmii";
> +                ethernet = <&cpu_host_port>;
> +                rx-internal-delay-ps = <2000>;
> +                tx-internal-delay-ps = <2000>;
> +
> +                fixed-link {
> +                    speed = <1000>;
> +                    full-duplex;
> +                    pause;
> +                };
> +            };
> +        };
> +    };
> +...
> +
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7ae698067c41..8232da1b3951 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -17278,6 +17278,7 @@ M:	Jens Emil Schulz Østergaard <[email-masked]>
>  M:	[email-masked]
>  L:	[email-masked]
>  S:	Maintained
> +F:	Documentation/devicetree/bindings/net/dsa/microchip,lan96455s-switch.yaml
>  F:	include/linux/dsa/lan9645x.h
>  F:	net/dsa/tag_lan9645x.c
>  
> 
> -- 
> 2.52.0
>