[PATCH v2] ARM: pxa: magician: Add support for ADS7846 touchscreen

[Petr Cvek]

Dne 13.3.2017 v 01:25 Petr Cvek napsal(a):
> This patch adds a support for ADS7846 touchscreen driver.
> 
> The basic functionality was tested, x_plate_ohms and y_plate_ohms were
> physically measured. The value pressure_max was empirically set to match
> the measured range, which is affected by x_plate_ohms and ADS samples.
> 
> The value of keep_vref_on doesn't seem to have any effect on measurements
> (at least on T-Mobile MDA Compact PM10A device). Leave it to zero so
> the internal and external Vref sources will not collide.

Actually not, without vref on the touchscreen seems to be highly jittery.

Sending version 3 (fixed patch and a new commit message).

Petr