SMI_ACCESS_PHY_CTRL_2
err = regmap_write(regmap, SMI_ACCESS_PHY_CTRL_2, FIELD_PREP(PHY_CTRL_INDATA, port));
err = regmap_read(regmap, SMI_ACCESS_PHY_CTRL_2, &val);
err = regmap_write(regmap, SMI_ACCESS_PHY_CTRL_2, FIELD_PREP(PHY_CTRL_INDATA, value));
err = regmap_write(regmap, SMI_ACCESS_PHY_CTRL_2, val);
err = regmap_read(regmap, SMI_ACCESS_PHY_CTRL_2, &val);
err = regmap_write(regmap, SMI_ACCESS_PHY_CTRL_2, val);