How to read ISP registers of RK3399 in ubuntu?

pinetree999

I can read GPIO and many other registers.
But how can I read mipi status register 0xff911c04 or 0xff921c04 in ubuntu?
While I send "io 0xff911c04" through spi port,it halted.And I have to reset it.

penguin

What is ' through spi port ' ?

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