Spi driver doesn't appear in dev folder

Hi all. I have a big problem and I don’t understand which could be the solution.
I have a mangOH green and a module wp7607. I have to use IoT slot for CABbus, but I can’t make available SPI bus!
I compiled a mangOH update file and I downloaded the 13 fw version. When enter in the board through ssh command, I can’t see SPI drivers in dev folder:
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What I should to do in order to solve the problem?