Question about device tree and modalias

I am beginning to study device tree and I have a question.
There is a drive available for the device enc28j60, an ethernet chip with spi interface. The drive has modalias "spi:enc28j60" what is used by the old linux device module to match with the plataform modalias.

I am including in the device tree:

    fragment@1 {
        target = <&spi1>;
        __overlay__ {

             #address-cells = <1>;
             #size-cells = <0>;
             status = "okay";
             pinctrl-names = "default";
             pinctrl-0 = <&spi1_pins_s0>;
             ti,pindir-d0-out-d1-in = <1>;

             spidev@1 {
                 spi-max-frequency = <24000000>;
                 reg = <0>;
                 compatible = "linux,spidev";

                 ethernet: enc28j60@0 {
                        compatible = "microchip,enc28j60";
                 };
             };
        };
    };

but the result for modalias is "platform:[email protected]" what doesn't match with "spi:enc28j60".

Someone can explain or point some tutorials to describe the correct way to migrate one drive to device tree model?

Sincerely,
Ventura
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