F_RD_MODE
ret = regmap_field_write(i2c->fields[F_RD_MODE], 0);
[F_RD_MODE] = MST_REG_FIELD(RTL9300_I2C_MST_CTRL2, 15, 15),
[F_RD_MODE] = MST_REG_FIELD(RTL9310_I2C_MST_CTRL, 4, 4),