Register interrupt return -22 error

I have a problem, return to the -22 error in the request_irq function call.

Register interrupt device is the FPGA side PushButton, offset address is 0x000100c0

The following is the content of the button_pio device tree.

The priority of button_pio is FPGA_IRQ5,Find in Handbook,

The 77 is the corresponding interrupt number(#define FPGA_BUTTON_DSR_IRQ 77).

button_pio: gpio@0x1000100C0 {compatible = "ALTR,pio-13.1", "ALTR,pio-1.0", "altr,pio-1.0";

reg = < 0x00000001 0x000100C0 0x00000010 >;

interrupt-parent = < &hps_0_arm_gic_0 >;

interrupts = < 0 45 1 >;

width = < 2 >; /* embeddedsw.dts.params.width type NUMBER */

resetvalue = < 0 >; /* embeddedsw.dts.params.resetvalue type NUMBER */

edge_type = < 1 >; /* embeddedsw.dts.params.edge_type type NUMBER */

level_trigger = < 0 >; /* embeddedsw.dts.params.level_trigger type NUMBER */

#gpio-cells = < 2 >;

gpio-controller;

The following is the driver code.

writel(pst_pio->np_pioedgecapture|0x1, &pst_pio->np_pioedgecapture);

writel(pst_pio->np_piodirection&0xfffffffe, &pst_pio->np_piodirection);

ret = request_irq(FPGA_BUTTON_DSR_IRQ, button_dsr_isr, IRQF_DISABLED, "button_dsr_fpga", (void*)(pst_dev));

if (ret != 0)

{

printk("button_dsr: unable to register interrupt %d\n", ret);

return -1;

}

writel(pst_pio->np_piointerruptmask|1, &pst_pio->np_piointerruptmask);

comment out "interrupts = < 0 45 1 >;" after successful registration, interrupt can also be normal response.

what is the reason&#65311;

If you have any ideas would be greatly appreciated.Thanks