of_find_all_nodes
for (np = NULL; (np = of_find_all_nodes(np));) {
while ((np = of_find_all_nodes(np))) {
while((np = of_find_all_nodes(np)) != NULL) {
EXPORT_SYMBOL(of_find_all_nodes);
extern struct device_node *of_find_all_nodes(struct device_node *prev);