Subject: Re: [net-next v4 1/5] dt-bindings: net: Add MTIP L2 switch description

From: Rob Herring <[email-masked]>
Date: Thu, 10 Apr 2025 15:59:25 -0500

On Mon, Apr 07, 2025 at 04:51:53PM +0200, Lukasz Majewski wrote:
> This patch provides description of the MTIP L2 switch available in some
> NXP's SOCs - e.g. imx287.
> 
> Signed-off-by: Lukasz Majewski <[email-masked]>
> ---
> Changes for v2:
> - Rename the file to match exactly the compatible
>   (nxp,imx287-mtip-switch)
> 
> Changes for v3:
> - Remove '-' from const:'nxp,imx287-mtip-switch'
> - Use '^port@[12]+$' for port patternProperties
> - Drop status = "okay";
> - Provide proper indentation for 'example' binding (replace 8
>   spaces with 4 spaces)
> - Remove smsc,disable-energy-detect; property
> - Remove interrupt-parent and interrupts properties as not required
> - Remove #address-cells and #size-cells from required properties check
> - remove description from reg:
> - Add $ref: ethernet-switch.yaml#
> 
> Changes for v4:
> - Use $ref: ethernet-switch.yaml#/$defs/ethernet-ports and remove already
>   referenced properties
> - Rename file to nxp,imx28-mtip-switch.yaml
> ---
>  .../bindings/net/nxp,imx28-mtip-switch.yaml   | 126 ++++++++++++++++++
>  1 file changed, 126 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/nxp,imx28-mtip-switch.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/nxp,imx28-mtip-switch.yaml b/Documentation/devicetree/bindings/net/nxp,imx28-mtip-switch.yaml
> new file mode 100644
> index 000000000000..1afaf8029725
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/nxp,imx28-mtip-switch.yaml
> @@ -0,0 +1,126 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/nxp,imx28-mtip-switch.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP SoC Ethernet Switch Controller (L2 MoreThanIP switch)
> +
> +maintainers:
> +  - Lukasz Majewski <[email-masked]>
> +
> +description:
> +  The 2-port switch ethernet subsystem provides ethernet packet (L2)
> +  communication and can be configured as an ethernet switch. It provides the
> +  reduced media independent interface (RMII), the management data input
> +  output (MDIO) for physical layer device (PHY) management.
> +
> +$ref: ethernet-switch.yaml#/$defs/ethernet-ports
> +

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

New bindings should only use 'ethernet-ports'.

> +    type: object
> +    additionalProperties: true

But what's this for? I thought you had some constrants for phy-mode and 
phy-handle?

> +
> +properties:
> +  compatible:
> +    const: nxp,imx28-mtip-switch
> +
> +  reg:
> +    maxItems: 1
> +
> +  phy-supply:
> +    description:
> +      Regulator that powers Ethernet PHYs.
> +
> +  clocks:
> +    items:
> +      - description: Register accessing clock
> +      - description: Bus access clock
> +      - description: Output clock for external device - e.g. PHY source clock
> +      - description: IEEE1588 timer clock
> +
> +  clock-names:
> +    items:
> +      - const: ipg
> +      - const: ahb
> +      - const: enet_out
> +      - const: ptp
> +
> +  interrupts:
> +    items:
> +      - description: Switch interrupt
> +      - description: ENET0 interrupt
> +      - description: ENET1 interrupt
> +
> +  pinctrl-names: true
> +
> +  mdio:
> +    type: object
> +    $ref: mdio.yaml#
> +    unevaluatedProperties: false
> +    description:
> +      Specifies the mdio bus in the switch, used as a container for phy nodes.
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - interrupts
> +  - mdio
> +  - ethernet-ports
> +
> +additionalProperties: false

unevaluatedProperties: false

> +
> +examples:
> +  - |
> +    #include<dt-bindings/interrupt-controller/irq.h>
> +    switch@800f0000 {
> +        compatible = "nxp,imx28-mtip-switch";
> +        reg = <0x800f0000 0x20000>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&mac0_pins_a>, <&mac1_pins_a>;
> +        phy-supply = <&reg_fec_3v3>;
> +        interrupts = <100>, <101>, <102>;
> +        clocks = <&clks 57>, <&clks 57>, <&clks 64>, <&clks 35>;
> +        clock-names = "ipg", "ahb", "enet_out", "ptp";
> +
> +        ethernet-ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            mtip_port1: ethernet-port@1 {
> +                reg = <1>;
> +                label = "lan0";
> +                local-mac-address = [ 00 00 00 00 00 00 ];
> +                phy-mode = "rmii";
> +                phy-handle = <&ethphy0>;
> +            };
> +
> +            mtip_port2: ethernet-port@2 {
> +                reg = <2>;
> +                label = "lan1";
> +                local-mac-address = [ 00 00 00 00 00 00 ];
> +                phy-mode = "rmii";
> +                phy-handle = <&ethphy1>;
> +            };
> +        };
> +
> +        mdio_sw: mdio {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            reset-gpios = <&gpio2 13 0>;
> +            reset-delay-us = <25000>;
> +            reset-post-delay-us = <10000>;
> +
> +            ethphy0: ethernet-phy@0 {
> +                reg = <0>;
> +            };
> +
> +            ethphy1: ethernet-phy@1 {
> +                reg = <1>;
> +            };
> +        };
> +    };
> -- 
> 2.39.5
>