As I mentioned in the other thread, it would help to know which TFT display you have. For example I have a few different displays that use the SPI interface to talk to the display. Other displays you talk to using either 4 or 8 pin parallel mode.
As for Touch control again it depends on the actual one. For example Adafruit sells a few different versions of the 2.8" tft display with touch. Some of them use SPI to communicate, some of them use I2C, and some of them use something like 4 IO pins with 2 of them digital and 2 of them analog.
Also I could not tell from your question which Edison breakout board are you using? The Arduino version or the small breakout board?