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