[PATCH v1 1/2] ethernet: eswin: Document for eic7700 SoC

[Andrew Lunn]

> +  phy-mode:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    enum: [mii, gmii, rgmii, rmii, sgmii]

In theory, all four rgmii modes should be listed. In practice, only
rgmii-id is likely to be used.

> +examples:
> +  - |
> +    gmac0: ethernet at 50400000 {
> +        compatible = "eswin,eic7700-qos-eth";
> +        reg = <0x0 0x50400000 0x0 0x10000>;
> +        interrupt-parent = <&plic>;
> +        interrupt-names = "macirq";
> +        interrupts = <61>;
> +        phy-mode = "rgmii";

Please don't use rgmii in an example. It is probably wrong, unless you
have an unusual PCB design.

	Andrew