[Buildroot] How to use the ft6236 touchscreen driver ?

[David Picard]

Hi,

I am trying to use the touch capability of Adafruit's PiTFT 2.8" on a 
RPi2, BR 2016.05. When I modprobe ft6236, nothing happens : no message 
in dmesg, no device created in /dev/input. i2cdetect detects it at 
address 38h.

I did load i2c_bcm2708, i2c-dev. I2C works (tested with a RTCC).

I tried :
# echo ft6236 0x38 > /sys/class/i2c-adapter/i2c-1/new_device

and I got something in dmesg :
ft6236 1-0038: irq is missing
ft6236: probe of 1-0038 failed with error -22
i2c i2c-1: new_device: Instantiated device ft6236 at 0x38

But still no entry in /dev/input.

Any idea ?
David.