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Currently CATU is the only helper device, and its enable and disable calls are hard coded. To allow more helper devices to be added in a generic way, remove these hard coded calls and just enable and disable all helper devices. This has to apply to helpers adjacent to the path, because they will never be in the path. CATU was already discovered in this way, so there is no change there. One change that is needed is for CATU to call back into ETR to allocate the buffer. Because the enable call was previously hard coded, it was done at a point where the buffer was already allocated, but this is no longer the case. Reviewed-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: James Clark <james.clark@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20230425143542.2305069-13-james.clark@arm.com