tegrakernel/kernel/kernel-4.9/Documentation/devicetree/bindings/spi/spi-xtensa-xtfpga.txt

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