Hi, all In function "of_find_node_with_property", why use "raw_spin_lock_irqsave" to disable preemption and disable interrupt? If enable them, what impact will be observed? This function just finds the node from the DTS file, it can't be interrupted or preempted? I have done one test: remove "raw_spin_lock_irqsave" and "raw_spin_unlock_irqrestore" from this function, It seems there is no any bad result, the Linux kernel still work well. Best Regards Jerry Huang