工作队列

/* init idpin interrupt */
1.
INIT_DELAYED_WORK(&musb->id_pin_work, musb_id_pin_work);

2.
struct device_node *node;
static int usb_iddig_number;
node = of_find_compatible_node(NULL, NULL, "mediatek,usb_iddig_eint");
of_property_read_u32_array(node, "debounce", ints, ARRAY_SIZE(ints));

usb_iddig_number = irq_of_parse_and_map(node, 0);
ret = request_irq(usb_iddig_number, mt_usb_ext_iddig_int, IRQF_TRIGGER_LOW, "USB_IDDIG", NULL);

static irqreturn_t mt_usb_ext_iddig_int(int irq, void *dev_id)
{
        iddig_cnt++;
        if (!mtk_musb->is_ready) {
                /* dealy 5 sec if usb function is not ready */
                schedule_delayed_work(&mtk_musb->id_pin_work, 5000*HZ/1000);
        } else {
                schedule_delayed_work(&mtk_musb->id_pin_work, sw_deboun_time*HZ/1000);
        }
        DBG(0, "id pin interrupt assert\n");
        disable_irq_nosync(usb_iddig_number);          
        return IRQ_HANDLED;
}

3.
static void musb_id_pin_work(struct work_struct *data)
{
}