nand_wait
wake_up(&ctrl->nand_wait);
init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait);
wait_event_timeout(ctrl->nand_wait, ctrl->nand_stat,
wait_event_timeout(ctrl->nand_wait, ctrl->nand_stat,
chip->legacy.waitfunc = nand_wait;
wait_queue_head_t nand_wait;