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docs: clk: add documentation to log which clocks have been disabled

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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>
This commit is contained in:
Brian Masney 2023-04-11 15:21:53 -04:00 committed by Jonathan Corbet
parent c9b951c313
commit 54d85d6966
1 changed files with 5 additions and 0 deletions
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5
Documentation/driver-api/clk.rst
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@ -258,6 +258,11 @@ clocks properly but rely on them being on from the bootloader, bypassing
the disabling means that the driver will remain functional while the issues the disabling means that the driver will remain functional while the issues
are sorted out. are sorted out.
You can see which clocks have been disabled by booting your kernel with these
parameters::
tp_printk trace_event=clk:clk_disable
To bypass this disabling, include "clk_ignore_unused" in the bootargs to the To bypass this disabling, include "clk_ignore_unused" in the bootargs to the
kernel. kernel.