read_csr_exp_stat
u32 (*read_csr_exp_stat)(void __iomem *csr_base_addr, u32 bank);
tmp_val = ops->read_csr_exp_stat(base, bank);
state->ringexpstat = ops->read_csr_exp_stat(base, bank);
csr_ops->read_csr_exp_stat = read_csr_exp_stat;