ADF4377_0012_R_DIV_MSK
ref_div_factor = FIELD_GET(ADF4377_0012_R_DIV_MSK, ref_div_factor);
ret = regmap_update_bits(st->regmap, 0x12, ADF4377_0012_R_DIV_MSK |
FIELD_PREP(ADF4377_0012_R_DIV_MSK, st->ref_div_factor));