NISTC_DIO_CTRL_DIR
devpriv->dio_control |= NISTC_DIO_CTRL_DIR(s->io_bits);
devpriv->dio_control = NISTC_DIO_CTRL_DIR(s->io_bits);
#define NISTC_DIO_CTRL_DIR_MASK NISTC_DIO_CTRL_DIR(0xff)