SPI support in GPIO

I recently bought a RockPro64 with 4GB and would like to control a 1.8 LCD screen with SPI interface using the pins on the GPIO header.

The system is running ayufan's Ubuntu minimal. 

I had success in simple GPIO switching by using the RP64-GPIO library:

However, I was not able to access SPI. I could not find any help or documentation on the internet, not even on the Wiki.

Anyone had success with this?

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