Hi,
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)
{
pr_info("%s\n",__func__);
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
