TMDS64EVM: GPIO falling edge interrupt configuration

Tool/software:

Hi,

In our custom hardware we want to use gpio falling edge interrupt and manage it in user space. For that purpose I used gpiolib and wrote some test application:

#include <cstdio>
#include <cstring>
#include <gpiod.h>


using namespace std;

#define GPIO_CHIP_DEFAULT "gpiochip1"
#define GPIO_LABEL_DEFAULT "STORE"

int main(int argc, char *argv[]) {


    if(argc < 3) {
        printf("Provide gpiochip and pinLabel\n");
        return 1;
    }   

    const char * pinLabel = argv[1];


    if(pinLabel == nullptr) {
        printf("Setting default pin label to: %s\n",GPIO_LABEL_DEFAULT);
        pinLabel = GPIO_LABEL_DEFAULT;
    }
    const char * gpioChipName = argv[2];
    if(gpioChipName == nullptr) {
        printf("Setting default gpiochip to: %s\n",GPIO_CHIP_DEFAULT);
        gpioChipName = GPIO_CHIP_DEFAULT;
    }

    gpiod_line * gpioLine;
    gpiod_chip * gpioChip;

    gpiod_line_event event;
    memset(&event,0,sizeof(event));

    gpioChip = gpiod_chip_open_by_name(gpioChipName);

    if(!gpioChip)
    {
         printf("Failed open gpiochip: %s!\n",gpioChipName);
         return 1;
    }

    gpioLine = gpiod_line_find(pinLabel);

    if(!gpioLine)
    {
        printf("Cannot find gpio line: %s!\n",pinLabel);
        goto release_chip;

    }

    if(gpiod_line_is_requested(gpioLine))
    {

        printf("Gpio line STORE reserved by other process!\n");
        goto release_chip;

    }

    if(gpiod_line_request_falling_edge_events(gpioLine,"PowerHoldUp"))
    {
        printf("Failed subscribe Gpio line %s on interrupt event!\n",pinLabel);
        goto release_line;

    }

    if (gpiod_line_event_wait(gpioLine,nullptr) > 0)
    {
        if (!gpiod_line_event_read(gpioLine, &event))
        {
            if(event.event_type == GPIOD_LINE_EVENT_FALLING_EDGE)
            {
             
                printf("falling edge interrupt triggered!\n");
           
            }
        }
    }

    printf("end of program!\n");
    release_line:
    gpiod_line_release(gpioLine);
    gpioLine = nullptr;
    release_chip:
    gpiod_chip_close(gpioChip);
    gpioChip = nullptr;



}

I also made some adjustment in device tree:

&main_gpio0 {
      status = "okay";
      ti,ngpio = <32>;
      
      gpio-line-names = "GPIO0_0", "BIO_INT1", "TF11", "TF12",
                        "GPIO0_4","STORE","FACTORY_DEFAULT",
                        "U1_BTN_INT","TF1","GPIO0_9","GPIO0_10",
                        "ANALOG_RFU0","ANALOG_RFU1",
                        "BIO_INT2","BIO_INT3","GPIO0_31",
                        "GPIO0_32","ADC_MCLK","ACT_RELAY","ADC_CONVST_SAR",
                        "ADC_SAMPLE_CLK","TF2","ANALOG_INT","GPIO0_39",
                        "GPIO0_40","ADC_DRDY","VPP_EN","RTC_1PPS";
};

&main_pmx0 {
	pinctrl-names = "default";
	pinctrl-0 = <&store_pin>;
	
  	store_pin: store-pin {
  		pinctrl-single,pins = <
                        AM64X_IOPAD(0x0014, PIN_INPUT, 7) /* (M20) GPIO0_5 */
                >;
        };
};

But seems that it is not enough because interrupt is not tirggered after shorting STORE pin into GND. I tested this code also on Raspberry PI 4 and it works fine. So I guess application is written correct. So what is missed in configuration on AM6442 side? We are using custom image build via Yocto and meta-ti layer SDK 9.0 

BR,

Jakub