VC5_REF_DIVIDER
ret = regmap_read(vc5->regmap, VC5_REF_DIVIDER, &div);
return regmap_update_bits(vc5->regmap, VC5_REF_DIVIDER, 0xff, 0x00);
ret = regmap_update_bits(vc5->regmap, VC5_REF_DIVIDER, 0xff, div);