REG_DIV_CTL1
regmap_read(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1, &div_factor);
ret = regmap_update_bits(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1,
regmap_read(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1, &div_factor);