net: dsa: mt7530: introduce mt7530_probe_common helper function

Move commonly used parts from mt7530_probe into new mt7530_probe_common
helper function which will be used by both, mt7530_probe and the
to-be-introduced mt7988_probe.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mt7530.c

@@ -3142,44 +3142,21 @@ static const struct of_device_id mt7530_of_match[] = {
 MODULE_DEVICE_TABLE(of, mt7530_of_match);
 
 static int
-mt7530_probe(struct mdio_device *mdiodev)
+mt7530_probe_common(struct mt7530_priv *priv)
 {
-	static struct regmap_config *regmap_config;
-	struct mt7530_priv *priv;
-	struct device_node *dn;
-	int ret;
-
-	dn = mdiodev->dev.of_node;
-
-	priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	struct device *dev = priv->dev;
 
-	priv->ds = devm_kzalloc(&mdiodev->dev, sizeof(*priv->ds), GFP_KERNEL);
+	priv->ds = devm_kzalloc(dev, sizeof(*priv->ds), GFP_KERNEL);
 	if (!priv->ds)
 		return -ENOMEM;
 
-	priv->ds->dev = &mdiodev->dev;
+	priv->ds->dev = dev;
 	priv->ds->num_ports = MT7530_NUM_PORTS;
 
-	/* Use medatek,mcm property to distinguish hardware type that would
-	 * casues a little bit differences on power-on sequence.
-	 */
-	priv->mcm = of_property_read_bool(dn, "mediatek,mcm");
-	if (priv->mcm) {
-		dev_info(&mdiodev->dev, "MT7530 adapts as multi-chip module\n");
-
-		priv->rstc = devm_reset_control_get(&mdiodev->dev, "mcm");
-		if (IS_ERR(priv->rstc)) {
-			dev_err(&mdiodev->dev, "Couldn't get our reset line\n");
-			return PTR_ERR(priv->rstc);
-		}
-	}
-
 	/* Get the hardware identifier from the devicetree node.
 	 * We will need it for some of the clock and regulator setup.
 	 */
-	priv->info = of_device_get_match_data(&mdiodev->dev);
+	priv->info = of_device_get_match_data(dev);
 	if (!priv->info)
 		return -EINVAL;
 
@@ -3193,23 +3170,53 @@ mt7530_probe(struct mdio_device *mdiodev)
 		return -EINVAL;
 
 	priv->id = priv->info->id;
+	priv->dev = dev;
+	priv->ds->priv = priv;
+	priv->ds->ops = &mt7530_switch_ops;
+	mutex_init(&priv->reg_mutex);
+	dev_set_drvdata(dev, priv);
 
-	if (priv->id == ID_MT7530) {
-		priv->core_pwr = devm_regulator_get(&mdiodev->dev, "core");
-		if (IS_ERR(priv->core_pwr))
-			return PTR_ERR(priv->core_pwr);
+	return 0;
+}
 
-		priv->io_pwr = devm_regulator_get(&mdiodev->dev, "io");
-		if (IS_ERR(priv->io_pwr))
-			return PTR_ERR(priv->io_pwr);
-	}
+static int
+mt7530_probe(struct mdio_device *mdiodev)
+{
+	static struct regmap_config *regmap_config;
+	struct mt7530_priv *priv;
+	struct device_node *dn;
+	int ret;
+
+	dn = mdiodev->dev.of_node;
 
-	/* Not MCM that indicates switch works as the remote standalone
+	priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->bus = mdiodev->bus;
+	priv->dev = &mdiodev->dev;
+
+	ret = mt7530_probe_common(priv);
+	if (ret)
+		return ret;
+
+	/* Use medatek,mcm property to distinguish hardware type that would
+	 * cause a little bit differences on power-on sequence.
+	 * Not MCM that indicates switch works as the remote standalone
 	 * integrated circuit so the GPIO pin would be used to complete
 	 * the reset, otherwise memory-mapped register accessing used
 	 * through syscon provides in the case of MCM.
 	 */
-	if (!priv->mcm) {
+	priv->mcm = of_property_read_bool(dn, "mediatek,mcm");
+	if (priv->mcm) {
+		dev_info(&mdiodev->dev, "MT7530 adapts as multi-chip module\n");
+
+		priv->rstc = devm_reset_control_get(&mdiodev->dev, "mcm");
+		if (IS_ERR(priv->rstc)) {
+			dev_err(&mdiodev->dev, "Couldn't get our reset line\n");
+			return PTR_ERR(priv->rstc);
+		}
+	} else {
 		priv->reset = devm_gpiod_get_optional(&mdiodev->dev, "reset",
 						      GPIOD_OUT_LOW);
 		if (IS_ERR(priv->reset)) {
@@ -3218,12 +3225,15 @@ mt7530_probe(struct mdio_device *mdiodev)
 		}
 	}
 
-	priv->bus = mdiodev->bus;
-	priv->dev = &mdiodev->dev;
-	priv->ds->priv = priv;
-	priv->ds->ops = &mt7530_switch_ops;
-	mutex_init(&priv->reg_mutex);
-	dev_set_drvdata(&mdiodev->dev, priv);
+	if (priv->id == ID_MT7530) {
+		priv->core_pwr = devm_regulator_get(&mdiodev->dev, "core");
+		if (IS_ERR(priv->core_pwr))
+			return PTR_ERR(priv->core_pwr);
+
+		priv->io_pwr = devm_regulator_get(&mdiodev->dev, "io");
+		if (IS_ERR(priv->io_pwr))
+			return PTR_ERR(priv->io_pwr);
+	}
 
 	regmap_config = devm_kzalloc(&mdiodev->dev, sizeof(*regmap_config),
 				     GFP_KERNEL);