I am pretty sure that the problem is in the following block of code:
*interrupts *
*= <8 13 2>; irq-gpios = <8 13>;
reset-gpios = <8 14>;*
I do not know how to define these gpios in that block of code, how to
assign them to interrupts, irg-gpios and reset-gpios.
Gpio which is connected to GT911 controller's interrupt is P8_13 and gpio
for reset of the GT911 controller is P8_14.
четвртак, 29. септембар 2016. 09.50.06 UTC+2, [email protected] је
написао/ла:
>
>
> Dear all,
>
> I recently acquired 5" LCD display DSN50602-PCT with capacitive touch
> panel, thus my intention was to use it with Beaglebone Black board.
> The image which I chose for this project is:
>
> debian@beaglebone:~$ cat /etc/dogtag
> BeagleBoard.org Debian Image 2016-01-10
> debian@beaglebone:~$ uname -r
> 4.1.33-bone24
>
>
> There was no problem in writing appropriate dts for the display and it
> works flawlessly. The challenge was to expand dts to support capacitive
> touch panel with its controller Goodix GT911. The controller communicates
> with BBB via i2c1 bus and furthermore uses two additional gpios, one for
> the interrupt and another for reset.
> So, finally, I had expanded my lcd dts with the following fragments:
>
> fragment@0 {
> target = <&am33xx_pinmux>;
> __overlay__ {
> bb_i2c1_pins: pinmux_bb_i2c1_pins {
> pinctrl-single,pins = <
> BONE_P9_18 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP |
> MUX_MODE2)
> BONE_P9_17 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP |
> MUX_MODE2)
> >;
> };
>
> gt911_ts: pinmux_gt911_ts {
> pinctrl-single,pins = <
> BONE_P8_14 (PIN_OUTPUT_PULLUP | MUX_MODE7)
> BONE_P8_13 (PIN_INPUT_PULLUP | MUX_MODE7)
> >;
> };
> };
> };
>
> fragment@1 {
> target = <&i2c1>;
> __overlay__ {
> pinctrl-names = "default";
> pinctrl-0 = <&bb_i2c1_pins>;
> status = "okay";
> clock-frequency = <100000>;
>
> /* shut up DTC warnings */
> #address-cells = <1>;
> #size-cells = <0>;
>
> ctp@5d {
> status = "okay";
> pinctrl-names = "default";
> pinctrl-0 = <>911_ts>;
> compatible = "goodix,gt911";
>
> reg = <0x5d>;
> interrupt-parent = <>911_ts>;
> interrupts = <8 13 2>;
> irq-gpios = <8 13>;
> reset-gpios = <8 14>;
> touchscreen-swapped-x-y;
> };
> };
> };
>
>
> Of course, goodix modul is needed for the touchscreen, so I had it added
> to /etc/modules-load.d/modules.conf file.
>
>
> When I power up the BBB, the touchscreen is not functioning.
> From dmesg I cannot see what is wrong:
>
> debian@beaglebone:~$ dmesg | grep Goodix
> [ 5.574184] Goodix-TS 1-005d: IC VERSION: 39 31 31 00 60 10
> [ 5.596674] input: Goodix Capacitive TouchScreen as /devices/platform/
> ocp/4802a000.i2c/i2c-1/1-005d/input/input1
>
>
> Now comes the interesting part.
> After restarting the operating system (sudo shutdown -r now), I get fully
> functional touchscreen panel which will work perfectly until I shutdown the
> board. There is no difference in dmesg log which would give me a clue why
> the touchscreen behaves differently depending whether I am powering up the
> system or resetting it.
>
> I am struggling with this for few days now and I thought that maybe there
> is some difference between power-up and restart which reflects on
> touchscreen functionallity.
>
> I would gladly read your comments and ideas on how to resolve the issue
> which I am facing with.
>
>
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