162306a36Sopenharmony_ci* Liebherr's BK4 controller external SPI 262306a36Sopenharmony_ci 362306a36Sopenharmony_ciA device which handles data acquisition from compatible industrial 462306a36Sopenharmony_ciperipherals. 562306a36Sopenharmony_ciThe SPI is used for data and management purposes in both master and 662306a36Sopenharmony_cislave modes. 762306a36Sopenharmony_ci 862306a36Sopenharmony_ciRequired properties: 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci- compatible : Should be "lwn,bk4" 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ciRequired SPI properties: 1362306a36Sopenharmony_ci 1462306a36Sopenharmony_ci- reg : Should be address of the device chip select within 1562306a36Sopenharmony_ci the controller. 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_ci- spi-max-frequency : Maximum SPI clocking speed of device in Hz, should be 1862306a36Sopenharmony_ci 30MHz at most for the Liebherr's BK4 external bus. 1962306a36Sopenharmony_ci 2062306a36Sopenharmony_ciExample: 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_cispidev0: spi@0 { 2362306a36Sopenharmony_ci compatible = "lwn,bk4"; 2462306a36Sopenharmony_ci spi-max-frequency = <30000000>; 2562306a36Sopenharmony_ci reg = <0>; 2662306a36Sopenharmony_ci}; 27