Enable dynamic debug for multiple files at boot
Separate control commands with semicolons.
dyndbg='file drivers/<filename1> +p; file drivers/<filename2> +p; file drivers/<filename3> +p'
Enable dynamic debug at boot
After setting the bootargs as dyndbg=\\"file drivers/clk/clk.c +p\\", proper query has been sent through kernel command line and it worked as expected.
Cannot enable kernel dynamic debugging on linux
The redirection (with the > shell operator) is not performed as root. That's why you get a permission denied error. I suggest you run the whole command in a sub shell like:
sudo sh -c "echo 'module xhci_hcd +p' > /sys/kernel/debug/dynamic_debug/control"
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