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docs: clk: add documentation to log which clocks have been disabled
The existing clk documentation has a section that talks about the clk_ignore_unused kernel parameter. Add additional documentation that describes how to log which clocks the kernel disables on bootup. This will log messages like the following to the console on bootup: [ 1.268115] clk: Disabling unused clocks [ 1.272167] clk_disable: gcc_usb_clkref_en [ 1.276389] clk_disable: gcc_usb30_sec_sleep_clk [ 1.281131] clk_disable: gcc_usb30_prim_sleep_clk ... Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20230411192153.289688-1-bmasney@redhat.com [jc: turned parameters into a literal block] Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -258,6 +258,11 @@ clocks properly but rely on them being on from the bootloader, bypassing
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the disabling means that the driver will remain functional while the issues
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are sorted out.
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You can see which clocks have been disabled by booting your kernel with these
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parameters::
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tp_printk trace_event=clk:clk_disable
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To bypass this disabling, include "clk_ignore_unused" in the bootargs to the
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kernel.
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