[openwrt/openwrt] ramips: mt7620: remove useless GMAC nodes

[LEDE Commits]

981213 pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/a2acdf9607045e5669c305c57dd7c77be8351ba0

commit a2acdf9607045e5669c305c57dd7c77be8351ba0
Author: Michael Pratt <mcpratt at pm.me>
AuthorDate: Fri Jun 11 14:54:43 2021 -0400

    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 at pm.me>
---
 target/linux/ramips/dts/mt7620n.dtsi                       | 14 --------------
 target/linux/ramips/dts/mt7620n_dlink_dwr-921-c1.dts       |  6 ------
 target/linux/ramips/dts/mt7620n_dlink_dwr-922-e2.dts       |  6 ------
 .../linux/ramips/files/drivers/net/ethernet/ralink/mdio.c  |  5 ++++-
 4 files changed, 4 insertions(+), 27 deletions(-)

diff --git a/target/linux/ramips/dts/mt7620n.dtsi b/target/linux/ramips/dts/mt7620n.dtsi
index d225cb25d8..276bc13733 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 at 4 {
-			compatible = "mediatek,mt7620a-gsw-port", "mediatek,eth-port";
-			reg = <4>;
-
-			status = "disabled";
-		};
 	};
 
 	gsw: gsw at 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 c784839c34..d37bdb4013 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 at 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 9400394d89..d3ca0dd53f 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 at 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 dceb08b835..b923b02af9 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;
 }