Hi Sean

+	regmap = devm_regmap_init(ds->dev, NULL, priv,
+				  &mt7530_regmap_config);
+	if (IS_ERR(regmap))
+		dev_warn(priv->dev, "phy regmap initialization failed");
+

Shouldn't this be a fatal error? If you keep going when there is an
error, what happens when you actually try to use the regmap?

+	phy_mode = of_get_phy_mode(ds->ports[ds->dst->cpu_port].dn);
+	if (phy_mode < 0) {
+		dev_err(priv->dev, "Can't find phy-mode for master device\n");
+		return phy_mode;
+	}
+	dev_info(priv->dev, "phy-mode for master device = %x\n", phy_mode);

dev_dbg? 

+
+	id = mt7530_read(priv, MT7530_CREV);
+	id >>= CHIP_NAME_SHIFT;
+	if (id != MT7530_ID)
+		return -ENODEV;

It might be helpful to say what ID has been found, if it is not the
supported ID.

	Andrew