[fedora-arm] [RaspberryPI 3B] [unicorn Hat] [how to configure spi]

Hello
I am running raspberry pi3B and with lastest fedora 28 (with kernel 4.16.0-300.fc28.aarch64)

I read from the unicorn Hat that I need to activate SPI using raspi-config ( for raspbian only)

So I tried to do it manually .. and that's when everything did not go so well :)
I understood that I have to tune /boot/efi/config.txt file adding
device_tree_param=spi=on
I guess I have also to add a dtoverlay line but I don't which one ...

Thanks
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