I also tried that without success :S
But as I mentioned before, per the schematic (http://mirror.lemaker.org/LeMaker%20Hikey%20Schematic.pdf) and the breakout header, I would expect to see 3x dev entries for the i2C hosts, i.e.:
However I can only see /dev/i2c-0. I also noticed that I2C2_SCL and I2C2_SDA are hooked up to HDMI controller so not sure if that (/dev/i2c-0) is actually interfacing with that instead of being mapped to I2C0 and I2C1.
Right now, I have the I2C interface hooked up to a DSO and for testing purpose do not have anything on the bus. The Hikey board seem to have the required pull-up resistors so if anything gets written to the bus I should see the capture on the DSO. I don't get anything out.
If this is supposed to work, I'll check the Kernel build options tonight.