LOONGSON2_I2C_CR1_ACK
LOONGSON2_I2C_CR1_ACK | LOONGSON2_I2C_CR1_POS, 0);
regmap_update_bits(priv->regmap, LOONGSON2_I2C_CR1, LOONGSON2_I2C_CR1_ACK, 0);
regmap_update_bits(priv->regmap, LOONGSON2_I2C_CR1, LOONGSON2_I2C_CR1_ACK,
LOONGSON2_I2C_CR1_ACK);
regmap_update_bits(priv->regmap, LOONGSON2_I2C_CR1, LOONGSON2_I2C_CR1_ACK, 0);