1* Liebherr's BK4 controller external SPI 2 3A device which handles data acquisition from compatible industrial 4peripherals. 5The SPI is used for data and management purposes in both master and 6slave 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 within 15 the controller. 16 17- spi-max-frequency : Maximum SPI clocking speed of device in Hz, should be 18 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