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Leo Yan 331b31bfe7 coresight: Appropriately disable trace bus clocks 
[ Upstream commit a8f2d480f1 ]

Some CoreSight components have trace bus clocks 'atclk' and are enabled
using clk_prepare_enable().  These clocks are not disabled when modules
exit.

As atclk is optional, use devm_clk_get_optional_enabled() to manage it.
The benefit is the driver model layer can automatically disable and
release clocks.

Check the returned value with IS_ERR() to detect errors but leave the
NULL pointer case if the clock is not found.  And remove the error
handling codes which are no longer needed.

Fixes: d1839e6877 ("coresight: etm: retrieve and handle atclk")
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250731-arm_cs_fix_clock_v4-v6-5-1dfe10bb3f6f@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-10-15 12:04:06 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.