The QSPI controller includes the following clocks:
- QSPI_REF_CLK for controller reference clock, see CRP QSPI_REF_CTRL register
- PMC_IRO_CLK for AXI DMA interface
- PMC_LSBUS_CLK for APB programming interface
- QSPIx_CLK for the I/O interface, two are present
The clock for the flash device I/O interface comes from the QSPI baud-rate generator. The baud-rate generator takes in the QSPI_REF_CLK clock and divides it down using the GQSPI_Cfg [BAUD_RATE_DIV] field to generate QSPIx_CLK.