GPIO5_IO26 IRQ issue in i.MX8MM EVK HW

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GPIO5_IO26 IRQ issue in i.MX8MM EVK HW

Contributor IV


I am working with i.mx8mm evk and yocto distribution 4.19 warrior version.

My application requires rising edge sensitive interrupt, so i need to use gpio pins instead of EXP_IO interrupt (which is giving level sensitive interrupts). so i have chosen UART3_RxD / GPIO5_IO26 pin for my IRQ

uart3_rxd pad is muxed with gpio5_io26, I made the below changes in the dts file.

my_irq_pin: my_irq_pin {
        compatible = "my_drv";
        interrupt-parent = <&gpio5>;
        interrupts = <26 IRQ_TYPE_EDGE_RISING>;
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_myirq_pin>;
        status = "okay";

&iomuxc {
         pinctrl-names = "default";


         imx8mm-evk {
                 pinctrl_myirq_pin: myirq_pin {
                        fsl,pins = <

                             MX8MM_IOMUXC_UART3_RXD_GPIO5_IO26        0x16


                 pinctrl_uart1: uart1grp {
                        fsl,pins = <

                             MX8MM_IOMUXC_UART1_RXD_UART1_DCE_RX 0x140
                             MX8MM_IOMUXC_UART1_TXD_UART1_DCE_TX 0x140
                             /*MX8MM_IOMUXC_UART3_RXD_UART1_DCE_CTS_B 0x140 */
                             MX8MM_IOMUXC_UART3_TXD_UART1_DCE_RTS_B 0x140
                             MX8MM_IOMUXC_SD1_DATA4_GPIO2_IO6 0x19



commented out the red colored pad mux and ctrl for uart3_rxd in   pinctrl_uart1: uart1grp


In my driver code, i have registered the IRQ handler as below:

irq_num = platform_get_irq(pdev, 0); /* The irq_num for GPIO5_IO26 seems 218 */

if (request_irq(irq_num, my_isr_irq_handler,
    IRQF_TRIGGER_RISING, "my_isr", NULL) != 0) {
        pr_err("Fail to request my_isr irq interrupt!\n");
        return -1;

/* My ISR Handler Function */

irqreturn_t my_isr_irq_handler(int irq, void *dev_id)
    return IRQ_HANDLED;


#cat /proc/interrupts

        CPU0         CPU1        CPU2          CPU3
218: 0                 0               0                  0           gpio-mxc  26   Edge    my_isr


At J1003, Pin 10, I have applied a pulse of duty 400 usecs. But surprisingly for me the isr handler : my_isr_irq_handler   is not invoked.

Could you please help me to resolve this problem.

Thank you, Sreedhar

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