The QSPI complies with the PRCM slave-idle protocol. The QSPI_FCLK clock is gated based on the values loaded in the QSPI_SYSCONFIG[3:2] IDLE_MODE bit field. Three modes are supported:
Force-idle: The QSPI_FCLK clock is gated unconditionally by the QSPI.
No-idle: The QSPI_FCLK clock is never gated by the QSPI.
Smart-idle: The QSPI_FCLK clock is gated by the QSPI, depending on its internal requirements.