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This is done by sending IPC interrupt to RPM and is > implemented as .power_off() callback by registering MPM as parent power > domain to CPU cluster. [...] > If MPM has not registered with CPU cluster power domain, utilize the CPU PM > notifications to manage RPM communication when the last CPU goes to power > collapse. I have mixed feelings about this case. The RPMH RSC driver keeps that as a fallback for platforms which don't have PSCI OSI mode specifically. On the other hand, there are platforms (early arm64 - pre-msm8996 and almost all of the arm32 platforms) that don't define any CPU power domains, so perhaps it's necessary after all.. Konrad