On the 2.4 is I2c2 also used for the fan controller: https://github.com/turing-machines/BMC-Firmware/blob/d9c55b7adaa06ec9abcc707e6a2cc20e1195ee2a/tp2bmc/board/tp2bmc/sun8i-t113s-turing-pi2-v2.4.dts#L171