1*c66ec88fSEmmanuel Vadot* Liebherr's BK4 controller external SPI 2*c66ec88fSEmmanuel Vadot 3*c66ec88fSEmmanuel VadotA device which handles data acquisition from compatible industrial 4*c66ec88fSEmmanuel Vadotperipherals. 5*c66ec88fSEmmanuel VadotThe SPI is used for data and management purposes in both master and 6*c66ec88fSEmmanuel Vadotslave modes. 7*c66ec88fSEmmanuel Vadot 8*c66ec88fSEmmanuel VadotRequired properties: 9*c66ec88fSEmmanuel Vadot 10*c66ec88fSEmmanuel Vadot- compatible : Should be "lwn,bk4" 11*c66ec88fSEmmanuel Vadot 12*c66ec88fSEmmanuel VadotRequired SPI properties: 13*c66ec88fSEmmanuel Vadot 14*c66ec88fSEmmanuel Vadot- reg : Should be address of the device chip select within 15*c66ec88fSEmmanuel Vadot the controller. 16*c66ec88fSEmmanuel Vadot 17*c66ec88fSEmmanuel Vadot- spi-max-frequency : Maximum SPI clocking speed of device in Hz, should be 18*c66ec88fSEmmanuel Vadot 30MHz at most for the Liebherr's BK4 external bus. 19*c66ec88fSEmmanuel Vadot 20*c66ec88fSEmmanuel VadotExample: 21*c66ec88fSEmmanuel Vadot 22*c66ec88fSEmmanuel Vadotspidev0: spi@0 { 23*c66ec88fSEmmanuel Vadot compatible = "lwn,bk4"; 24*c66ec88fSEmmanuel Vadot spi-max-frequency = <30000000>; 25*c66ec88fSEmmanuel Vadot reg = <0>; 26*c66ec88fSEmmanuel Vadot}; 27