Your question is too vague. How did you do the "analysis"? Peak-calling? What kind of "meta-analysis" do you want to do? If you're trying to look for differences between samples, googling "differences chip-seq bioconductor" will already give a number of relevant hits.
If you want to use your MACS2 peaks, the DiffBind package offers a straightforward path to identifying differentially bound peaks. The csaw package is another alternative, particularly if your dataset requires more sophisticated normalization. In either case the original BAM files are required.
i did a peak-calling analysis by macs2.
i want to (meta-analysis) look for differences between samples.
What software or methods can I use?