linux dts interrupt

1. dts configuration

MX6SL_PAD_EPDC_D9__GPIO1_IO16       0x1b0b0

interrupt-parent = <&gpio1>;
interrupts = <16 2>;

2.  c source 

#include<linux/kernel.h>
#include<linux/types.h>
#include<linux/kthread.h>
#include<linux/wait.h>
#include<linux/string.h>
#include<linux/sysctl.h>
#include<linux/workqueue.h>
#include<linux/interrupt.h>
#include<linux/irq.h>
#include<linux/device.h>
#include<linux/gpio.h>

int irq = 176;

static int irq_handler(int irq_num, void *dev_id)
{
printk("interrupt handler function:%d...\n", irq_num);
return IRQ_WAKE_THREAD;
}

static int irq_thread_fn(int irq_num, void *dev_id)
{
printk("interrupt thread function:%d...\n", irq_num);
return IRQ_HANDLED;
}

static int __init request_threaded_irq_init(void)
{
int result = 0;

printk("gpio_to_irq()=%d\n", gpio_to_irq(16));
result = request_threaded_irq(irq, irq_handler, irq_thread_fn, IRQF_DISABLED,
"irq_test", NULL);
disable_irq(irq);
enable_irq(irq);
return 0;
}

static void __exit request_threaded_irq_exit(void)
{
free_irq(irq, NULL);
printk("Goodbye request_threaded_irq\n");
return;
}

module_init(request_threaded_irq_init);
module_exit(request_threaded_irq_exit);
MODULE_LICENSE("GPL");

3. result