1) OF unittest platform device ** unittest Required properties: - compatible: must be "unittest" All other properties are optional. Example: unittest { compatible = "unittest"; }; 2) OF unittest i2c adapter platform device ** platform device unittest adapter Required properties: - compatible: must be unittest-i2c-bus Children nodes contain unittest i2c devices. Example: unittest-i2c-bus { compatible = "unittest-i2c-bus"; }; 3) OF unittest i2c device ** I2C unittest device Required properties: - compatible: must be unittest-i2c-dev All other properties are optional Example: unittest-i2c-dev { compatible = "unittest-i2c-dev"; }; 4) OF unittest i2c mux device ** I2C unittest mux Required properties: - compatible: must be unittest-i2c-mux Children nodes contain unittest i2c bus nodes per channel. Example: unittest-i2c-mux { compatible = "unittest-i2c-mux"; #address-cells = <1>; #size-cells = <0>; channel-0 { reg = <0>; #address-cells = <1>; #size-cells = <0>; i2c-dev { reg = <8>; compatible = "unittest-i2c-dev"; }; }; };