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ramips: mt7620: remove useless GMAC nodes

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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>
(cherry picked from commit a2acdf9607045e5669c305c57dd7c77be8351ba0)
This commit is contained in:
Michael Pratt 2021-06-11 14:54:43 -04:00 committed by Petr Štetiar
parent a14c2d409c
commit 6491212ea7
4 changed files with 4 additions and 27 deletions
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14
target/linux/ramips/dts/mt7620n.dtsi
View File

@ -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 {

6
target/linux/ramips/dts/mt7620n_dlink_dwr-921-c1.dts
View File

@ -133,12 +133,6 @@
status = "okay";
};
&ethernet {
port@4 {
status = "okay";
};
};
&state_default {
default {
groups = "spi refclk", "i2c", "ephy", "wled";

6
target/linux/ramips/dts/mt7620n_dlink_dwr-922-e2.dts
View File

@ -136,12 +136,6 @@
status = "okay";
};
&ethernet {
port@4 {
status = "okay";
};
};
&state_default {
default {
groups = "spi refclk", "i2c", "ephy", "wled";

5
target/linux/ramips/files/drivers/net/ethernet/ralink/mdio.c
View File

@ -223,7 +223,8 @@ 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)) {
@ -255,6 +256,8 @@ 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;
}