The SPI clock does not run all the time. It is only clocking when an SPI
device is being accessed. You would only see the clock when the chip select
line for a peripheral is low.
Do you have the touch screen connected? The display driver tries to access
the display at startup. If it can not talk, the ADS7846 driver gets an error
and stops talking to the display. Look for 7846 in the boot log. Do "dmesg |
less" after you log in as root and search.
If you still can not see the clock, but think you should, I would gt out the
magnifier and look for a solder bridge.
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