How to use I2C Hub for RSB-4710
From ESS-WIKI
Use i2cdetect cmd to detect iic devices (for example, i2cdetect -y 4).
rk3399_rsb4710:/ $ i2cdetect -l i2c-0 unknown rk3x-i2c I2C adapter i2c-1 unknown rk3x-i2c I2C adapter i2c-4 unknown rk3x-i2c I2C adapter i2c-9 unknown DesignWare HDMI I2C adapter
root@linaro-alip:~# i2cdetect -y 4