F_SDA_OUT_SEL
ret = regmap_field_write(i2c->fields[F_SDA_OUT_SEL], chan->sda_num);
[F_SDA_OUT_SEL] = MST_REG_FIELD(RTL9300_I2C_MST_CTRL1, 4, 6),
[F_SDA_OUT_SEL] = MST_REG_FIELD(RTL9310_I2C_MST_CTRL, 18, 21),