Hi
I'm Trying to connect a TFT display 240x320 with TSC2046 touchscreen controller on iMX6ULL(OS Linux Debian 10.2. )
I ran into trouble in getting the TSC2046 (ads7846.c based) touchscreen controller up.
I have added the TS to my ecspi3. This is how the dts code looks.
&ecspi3 {
fsl,spi-num-chipselects = <1>;
cs-gpios = <&gpio1 20 0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi3>;
status = "okay";
tsc2046@0 {
compatible = "ti,tsc2046";
reg = <0>;
interrupt-parent = <&gpio1>;
interrupts = <2 0>;
spi-max-frequency = <1000000>;
pendown-gpio = <&gpio1 2 0>;
vcc-supply = <®_vref_3v3>;
ti,x-min = /bits/ 16 <0>;
ti,x-max = /bits/ 16 <240>;
ti,y-min = /bits/ 16 <0>;
ti,y-max = /bits/ 16 <320>;
ti,x-plate-ohms = /bits/ 16 <0>;
ti,pressure-max = /bits/ 16 <255>;
linux,wakeup;
touchscreen-size-x = <240>;
touchscreen-size-y = <320>;
touchscreen-inverted-x;
touchscreen-inverted-y;
};
};
Also I added the driver (ads7846.c based attached) using menuconfig and I see in booting the following
[ 2.376757] ads7846 spi2.0: spi_imx_setup: mode 0, 8 bpw, 1000000 hz
[ 2.376802] ads7846 spi2.0: setup mode 0, 8 bits/w, 1000000 Hz max --> 0
[ 2.378130] ads7846 spi2.0: touchscreen, irq 70
[ 2.384151] input: ADS7846 Touchscreen as /devices/soc0/soc/2000000.aips-bus/2000000.spba-bus/2010000.spi/spi_master/spi2/spi2.0/input/input0
[ 8.065019] evbug: Connected device: input0 (ADS7846 Touchscreen at spi2.0/input0)
When I prees on the display in some points - it always pressed on the farthest point.
What can be the problem? Is it in the dts? or I need to set something inside OS?
