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The PPC provides two Q-Channel interfaces for power and clock control. You can use one channel for clock control and the other channel for power control, which enables the PPC to indicate when it requires clock and power.
Both Q-Channels implement the low-power interfaces that the AMBA® Low Power Interface Specification, Arm® Q-Channel and P-Channel Interfaces describes.
The presence of a synchronizer on the clk_qreqn and pwr_qreqn inputs of the Q-Channels is configurable, by using the QCLK_SYNC_EN and QPWR_SYNC_EN parameters.