coresight: etm4x: Support atclk

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[ Upstream commit 40c0cdc9cb ]

The atclk is an optional clock for the CoreSight ETMv4, but the driver
misses to initialize it.

This change enables atclk in probe of the ETMv4 driver, and dynamically
control the clock during suspend and resume.

No need to check the driver data and clock pointer in the runtime
suspend and resume, so remove checks.  And add error handling in the
resume function.

Add a minor fix to the comment format when adding the atclk field.

Fixes: 2e1cdfe184 ("coresight-etm4x: Adding CoreSight ETM4x driver")
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-v6-3-1dfe10bb3f6f@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Leo Yan 2025-07-31 13:23:39 +01:00 • committed by Greg Kroah-Hartman

parent 46915cabba

commit e7c195695b

2 changed files with 18 additions and 6 deletions

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20

drivers/hwtracing/coresight/coresight-etm4x-core.c

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4

drivers/hwtracing/coresight/coresight-etm4x.h

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