huawei-mrd-kernel/Documentation/devicetree/bindings/spi/spi-dw.txt

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Synopsys DesignWare SPI master
Required properties:
- compatible: should be "snps,designware-spi"
- #address-cells: see spi-bus.txt
- #size-cells: see spi-bus.txt
- reg: address and length of the spi master registers
- interrupts: should contain one interrupt
- clocks: spi clock phandle
- num-cs: see spi-bus.txt
Optional properties:
- cs-gpios: see spi-bus.txt
Example:
spi: spi@4020a000 {
compatible = "snps,designware-spi";
interrupts = <11 1>;
reg = <0x4020a000 0x1000>;
clocks = <&pclk>;
num-cs = <2>;
cs-gpios = <&banka 0 0>;
};