When using spi communication, it is found that there is no spi discipline, only ssi; the relationship between the two:
SSI0_CLK----------SPI_CLK
SSI0_CE0 ---------- SPI_CS
SSI0_DT-----------SPI_MOSI
SSI0_DR-----------SPI_MISO
Insignia X series development 15---ssi to spi
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