Sorry to answer so late.
I have configured the I2C interface and the touch controller, but so far only tested with the examples, not with my code. The reason: I don’t actually need a touch function because I will write my own driver for IR-RC if one day the display will work!
The display module (BuyDisplay’s ER-TFTM035-6) has a FT6263 as the touch controller connected via I2C.