How to do clustering using the matrix of correlation coefficients?

Question

I have a correlation coefficient matrix (n*n). How to do clustering using the correlation coefficient matrix?

Can I use linkage and fcluster function in SciPy?

Linkage function needs n * m matrix (according to tutorial), but I want to use n*n matrix.

My code is

corre = mp_N.corr()    # mp_N is raw data (m*n matrix)  
Z = linkage(corre, method='average')  # 'corre' is correlation coefficient matrix
fcluster(Z,2,'distance')

Is this code right? If this code is wrong, how can I do clustering with correlation coefficient matrix?