Touch screen problem

[Bharathi Subramanian]

>> It mounts ads7846 touchscreen. In dmesg I have:
>> ads7846 spi3.0: no device detected, test read results was 0x00000000
>> ...
>> regulator_init_complete: vads7846: incomplete constraints, leaving on

Please change the mux setting of the SPI-3 pins. Otherwise, SPI3 will
not work. You need to set SPI-3 Clock as input.
Refer: elinux.org/BeagleBoard/SPI

-- 
Bharathi Subramanian