1Cadence Xtensa XTFPGA platform SPI controller. 2 3This simple SPI master controller is built into xtfpga bitstreams and is used 4to control daughterboard audio codec. 5 6Required properties: 7- compatible: should be "cdns,xtfpga-spi". 8- reg: physical base address of the controller and length of memory mapped 9 region. 10