BULK_IN_DLY
ret = lan78xx_write_reg(dev, BULK_IN_DLY, dev->bulk_in_delay);
ret = smsc75xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
ret = smsc75xx_read_reg(dev, BULK_IN_DLY, &buf);
ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);