Pin iomux about SPI

[vanaua]

Hi, I'm using the esp32-wroom series module for spi host and slave communication. The official example(/esp/esp-idf/examples/peripherals/spi_slave) has run successfully , but I noticed that the spi clock in the GPIO matrix is up to 26.66MHz, while the clock in IOMUX is up to 40MHz. so how do I write the program if I want to use the latter to realize the higher speed communication ? I will be grateful if you could give me some guidance.