device-tree-bindings/spi/spi-bus.txt

10 - #address-cells  - number of cells required to define a chip select
12 - #size-cells     - should be zero.
13 - compatible      - name of SPI bus controller following generic names
15 - cs-gpios	  - (optional) gpios chip select.
20 flexible and non-standardized, it is left out of this binding with the
26 - num-cs : total number of chipselects
28 If cs-gpios is used the number of chip select will automatically increased
29 with max(cs-gpios > hw cs)
31 So if for example the controller has 2 CS lines, and the cs-gpios
34 cs-gpios = <&gpio1 0 0> <0> <&gpio1 1 0> <&gpio1 2 0>;
46 - reg             - (required) chip select address of device.
47 - compatible      - (required) name of SPI device following generic names
49 - spi-max-frequency - (required) Maximum SPI clocking speed of device in Hz
50 - spi-cpol        - (optional) Empty property indicating device requires
52 - spi-cpha        - (optional) Empty property indicating device requires
54 - spi-cs-high     - (optional) Empty property indicating device requires
56 - spi-3wire       - (optional) Empty property indicating device requires
57     		    3-wire mode.
58 - spi-tx-bus-width - (optional) The bus width(number of data wires) that
60 - spi-rx-bus-width - (optional) The bus width(number of data wires) that
62 - spi-half-duplex  - (optional) Indicates that the SPI bus should wait for
67 Now the value that spi-tx-bus-width and spi-rx-bus-width can receive is
69 Dual/Quad mode is not allowed when 3-wire mode is used.
71 If a gpio chipselect is used for the SPI slave the gpio number will be passed
76 		#address-cells = <1>;
77 		#size-cells = <0>;
78 		compatible = "fsl,mpc5200b-spi","fsl,mpc5200-spi";
81 		interrupt-parent = <&mpc5200_pic>;
83 		ethernet-switch@0 {
85 			spi-max-frequency = <1000000>;
91 			spi-max-frequency = <100000>;