Hi, I have a query on device tree pertaining to modelling a gpio pin as an interrupt source. I have searched mailing list archives and kernel documentation before posting this and couldn't get any direct solution. (My understanding is limited and hence posting the query below:) My SOC has a gpio controller and uart both sharing same interrupt line as specified below. interrupt-parent = <&gic>; mygpio: gpio@0x19008000 { compatible = "mysoc,mygpio-controller,gc"; #address-cells = <1>; #size-cells = <1>; #gpio-cells = <2>; reg = gpio: <0x19008000 0x50>; ngpios = <12>; pin-offset = <4>; pin-base = <4>; irq-base = <256>; /* sw irq base for irq handlers */ gpio-controller; interrupt-controller; interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>; }; uart0: serial@0x19000300 { compatible = "snps,dw-apb-uart"; reg = <0x19000300 0x100>; interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>; clock-frequency = <62500000>; }; gpio pin 0 of mygpio is used as an interrupt source for detecting the presence of external pluggable device (that is not driven by kernel). And I intend to detect the presence of the pluggable device from user space by means of generic uio platform driver using below device tree configuration. (following https://yurovsky.github.io/2014/10/10/linux-uio-gpio-interrupt/) user_io@0 { compatible = "mydevice,generic-uio,ui_pdrv"; status = "okay"; interrupt-parent = <&mygpio>; interrupts = <0 IRQ_TYPE_LEVEL_HIGH>; }; Running modprobe uio_pdrv_genirq of_id="mydevice,generic-uio,ui_pdrv" and creating /dev/uio0 using mknod (major number from cat /proc/devices | grep uio), I couldn't see an irq entry bind to uio driver under /proc/interrupts. Am I doing anything wrong here? Other method I have tried to get notified of the gpio pin0 interrupt in user space is to poll on /sys/class/gpio/gpio0/value. But merely exporting gpio0 wasn't sufficient as kernel should make a call to request_irq on the gpio0 interrupt line. Is there a generic driver framework (like pinctrl) that can export a device node to register the gpio pin0 as an interrupt source that allows me to poll on its sysfs entry? Thanks, Rajasekhar