4 - compatible: should be one of ipmi-kcs, ipmi-smic, or ipmi-bt
5 - device_type: should be ipmi
6 - reg: Address and length of the register set for the device
9 - interrupts: The interrupt for the device. Without this the interface
11 - reg-size - The size of the register. Defaults to 1
12 - reg-spacing - The number of bytes between register starts. Defaults to 1
13 - reg-shift - The amount to shift the registers to the right to get the data
19 compatible = "ipmi-smic";
21 reg = <0xfff3a000 0x1000>;
22 interrupts = <0 24 4>;