NAU8540_REG_REFERENCE
{NAU8540_REG_REFERENCE, 0x0000},
regmap_update_bits(nau8540->regmap, NAU8540_REG_REFERENCE,
regmap_update_bits(nau8540->regmap, NAU8540_REG_REFERENCE,
regmap_update_bits(regmap, NAU8540_REG_REFERENCE,