coresight: cti: Access ASICCTL only when implemented

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According to the Arm ARM (DDI 0487 L.b), ASICCTL is implemented only
when CTIDEVID.EXTMUXNUM is non-zero.

Based on CTIDEVID.EXTMUXNUM, add a flag 'asicctl_impl' to indicate
whether the register is implemented, and access ASICCTL conditionally
based on the flag.

Allow the sysfs node to be visible only when the register is
implemented.

Reviewed-by: Mike Leach <mike.leach@arm.com>
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/20260226-arm_coresight_cti_refactor_v1-v2-3-b30fada3cfec@arm.com

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Leo Yan 2026-02-26 09:23:51 +00:00 • committed by Suzuki K Poulose

parent 6582fe69ac

commit b4d9ef475e

3 changed files with 19 additions and 1 deletions

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5

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

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13

drivers/hwtracing/coresight/coresight-cti-sysfs.c

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2

drivers/hwtracing/coresight/coresight-cti.h

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