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realtek: make all link speeds work for RTL8221B in Zyxel XGS1210-12 rev B1

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SGMII only works correctly on this device if inband auto-negotiation is
enabled. Configure the PHY for SGMII and in-band mode in the device tree
to make this happen.

For 2.5G link speeds the PHY will still switch to 2500Base-X without AN.

The same configuration also works on RTL8226, so it is fine to apply
this change to the A1 revision of XGS1010-12/XGS1210-12 as well.

Signed-off-by: Jan Hoffmann <jan@3e8.eu>
Link: https://github.com/openwrt/openwrt/pull/21605
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Jan Hoffmann 2026-01-19 18:45:46 +01:00 • committed by Robert Marko
parent 1c62e21a8d
commit 30f8ceaa7e
1 changed files with 4 additions and 2 deletions
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6
target/linux/realtek/dts/rtl9302_zyxel_xgs1x10-12-common.dtsi
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@ -221,16 +221,18 @@
label = "lan9";
pcs-handle = <&serdes6>;
phy-handle = <&phy24>;
phy-mode = "2500base-x";
phy-mode = "sgmii";
led-set = <1>;
managed = "in-band-status";
};
port@25 {
reg = <25>;
label = "lan10";
pcs-handle = <&serdes7>;
phy-handle = <&phy25>;
phy-mode = "2500base-x";
phy-mode = "sgmii";
led-set = <1>;
managed = "in-band-status";
};
port@26 {