[Buildroot] How to use the ft6236 touchscreen driver ?

[Baruch Siach]

Hi David,

On Wed, Jul 13, 2016 at 07:07:43PM +0200, David Picard wrote:
> 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 ?

You most likely need to update your device tree file (.dts), and add your 
PiTFT device as a sub-node of the i2c master.

baruch

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