Switching 5" to 7" display on SAMA5D34-EK

[Memphis]

Hi,
I have changed the 5" display of the board SAMA5D34-EK to an 7" TFT display. However I notice that the adc driver of the 3.10 Linux, sometimes it does not take the right position and the cursor is located in a different position compared to that pressed.
I've recalibrated the 7" display with ts_calibrate.
I must set up something at the driver level or in the device tree?
Thank you

Regards