I should connect miso mosi sck in miso out mosi out sck out and a free gpio as chip select?
I'm not a hardware person, sorry.
I would think you'd want MISO/MOSI/SCK to connect to the mining chips when GPIO-N is low, and connected to the microcontroller when GPIO-N is high.
But maybe it makes it easier or more sense to just chain the microcontroller on the end of the chips?