RCG_N_OFFSET
regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), &n);
RCG_N_OFFSET(rcg), mask, ~(f->n - f->m));
regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), ¬n_m);
regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), ¬n_m);