I have checked What SPI frequencies does Raspberry Pi support? question, anyway its subject is RPi, not RPi Compute module.
Also, I want to check for usable frequency, not theoretical. Limitations on 'normal' RPi are probably due to design and despite 125MHz claimed theoretical speed, only 32MHz speed is achievable in practice.
This place https://elinux.org/index.php?title=RPi_SPI#Speed_2 brings the info about max speed of 32MHz
Additionaly,I would also be happy if anybody could mention about any other SBC's with usable SPI frequency speed above 32MHz.