request_threaded_irq及IRQF_ONESHOT的简单研究
通过TP驱动的IRQ来做实验，中断为低有效，gpio默认状态为输入高电平，驱动内部代码为：ret =request_threaded_irq(touchdev->irq,NULL,zinitix_touch_work,IRQF_TRIGGER_FALLING| IRQF_ONESHOT , ZINITIX_DRIVER_NAME ,touch_dev)
