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1* Liebherr's BK4 controller external SPI2 3A device which handles data acquisition from compatible industrial4peripherals.5The SPI is used for data and management purposes in both master and6slave modes.7 8Required properties:9 10- compatible : Should be "lwn,bk4"11 12Required SPI properties:13 14- reg : Should be address of the device chip select within15 the controller.16 17- spi-max-frequency : Maximum SPI clocking speed of device in Hz, should be18 30MHz at most for the Liebherr's BK4 external bus.19 20Example:21 22spidev0: spi@0 {23 compatible = "lwn,bk4";24 spi-max-frequency = <30000000>;25 reg = <0>;26};27