From: Michael Pratt <mcpratt@pm.me>
Date: Fri, 11 Jun 2021 18:54:43 +0000 (-0400)
Subject: ramips: mt7620: remove useless GMAC nodes
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=a2acdf9607045e5669c305c57dd7c77be8351ba0;p=openwrt%2Fstaging%2Fblogic.git

ramips: mt7620: remove useless GMAC nodes

These nodes are used for configuring a GMAC interface
and for defining external PHYs to be accessed with MDIO.

None of this is possible on MT7620N, only MT7620A,
so remove them from all MT7620N DTS.

When the mdio-bus node is missing, the driver returns -NODEV
which causes the internal switch to not initialize.
Replace that return so that everything works without the DTS node.

Also, an extra kernel message to indicate for all error conditions
that mdio-bus is disabled.

Fixes: d482356322c9 ("ramips: mt7620n: add mdio node and disable port4 by default")
Fixes: aa5014dd1a58 ("ramips: mt7620n: enable port 4 as EPHY by default")
Signed-off-by: Michael Pratt <mcpratt@pm.me>
---

diff --git a/target/linux/ramips/dts/mt7620n.dtsi b/target/linux/ramips/dts/mt7620n.dtsi
index d225cb25d898..276bc1373335 100644
--- a/target/linux/ramips/dts/mt7620n.dtsi
+++ b/target/linux/ramips/dts/mt7620n.dtsi
@@ -322,20 +322,6 @@
 		reset-names = "fe", "esw";
 
 		mediatek,switch = <&gsw>;
-
-		mdio-bus {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			status = "disabled";
-		};
-
-		port@4 {
-			compatible = "mediatek,mt7620a-gsw-port", "mediatek,eth-port";
-			reg = <4>;
-
-			status = "disabled";
-		};
 	};
 
 	gsw: gsw@10110000 {
diff --git a/target/linux/ramips/dts/mt7620n_dlink_dwr-921-c1.dts b/target/linux/ramips/dts/mt7620n_dlink_dwr-921-c1.dts
index c784839c349a..d37bdb40131d 100644
--- a/target/linux/ramips/dts/mt7620n_dlink_dwr-921-c1.dts
+++ b/target/linux/ramips/dts/mt7620n_dlink_dwr-921-c1.dts
@@ -133,12 +133,6 @@
 	status = "okay";
 };
 
-&ethernet {
-	port@4 {
-		status = "okay";
-	};
-};
-
 &state_default {
 	default {
 		groups = "spi refclk", "i2c", "ephy", "wled";
diff --git a/target/linux/ramips/dts/mt7620n_dlink_dwr-922-e2.dts b/target/linux/ramips/dts/mt7620n_dlink_dwr-922-e2.dts
index 9400394d89ec..d3ca0dd53f18 100644
--- a/target/linux/ramips/dts/mt7620n_dlink_dwr-922-e2.dts
+++ b/target/linux/ramips/dts/mt7620n_dlink_dwr-922-e2.dts
@@ -136,12 +136,6 @@
 	status = "okay";
 };
 
-&ethernet {
-	port@4 {
-		status = "okay";
-	};
-};
-
 &state_default {
 	default {
 		groups = "spi refclk", "i2c", "ephy", "wled";
diff --git a/target/linux/ramips/files/drivers/net/ethernet/ralink/mdio.c b/target/linux/ramips/files/drivers/net/ethernet/ralink/mdio.c
index dceb08b83527..b923b02af9f0 100644
--- a/target/linux/ramips/files/drivers/net/ethernet/ralink/mdio.c
+++ b/target/linux/ramips/files/drivers/net/ethernet/ralink/mdio.c
@@ -232,7 +232,8 @@ int fe_mdio_init(struct fe_priv *priv)
 	mii_np = of_get_child_by_name(priv->dev->of_node, "mdio-bus");
 	if (!mii_np) {
 		dev_err(priv->dev, "no %s child node found", "mdio-bus");
-		return -ENODEV;
+		err = 0;
+		goto err_no_bus;
 	}
 
 	if (!of_device_is_available(mii_np)) {
@@ -264,6 +265,8 @@ err_free_bus:
 	kfree(priv->mii_bus);
 err_put_node:
 	of_node_put(mii_np);
+err_no_bus:
+	dev_err(priv->dev, "%s disabled", "mdio-bus");
 	priv->mii_bus = NULL;
 	return err;
 }