How can set SPI port clock frequency at TX1 r28.2?

How can set SPI port clock frequency at TX1 r28.2?
for example 30.0MHz,40.0MHz,10.0MHz.

Please check below comment.

https://devtalk.nvidia.com/default/topic/1028541/jetson-tx2/spi-clock-rate-change-on-tx2/post/5231997/#5231997