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

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/30f8ceaa7e732eb97e66685816f3a49b6c0dba2c

commit 30f8ceaa7e732eb97e66685816f3a49b6c0dba2c
Author: Jan Hoffmann <jan at 3e8.eu>
AuthorDate: Mon Jan 19 18:45:46 2026 +0100

    realtek: make all link speeds work for RTL8221B in Zyxel XGS1210-12 rev B1
    
    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 at 3e8.eu>
    Link: https://github.com/openwrt/openwrt/pull/21605
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 target/linux/realtek/dts/rtl9302_zyxel_xgs1x10-12-common.dtsi | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/target/linux/realtek/dts/rtl9302_zyxel_xgs1x10-12-common.dtsi b/target/linux/realtek/dts/rtl9302_zyxel_xgs1x10-12-common.dtsi
index 9a0f4a9306..539cdb6229 100644
--- a/target/linux/realtek/dts/rtl9302_zyxel_xgs1x10-12-common.dtsi
+++ b/target/linux/realtek/dts/rtl9302_zyxel_xgs1x10-12-common.dtsi
@@ -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 at 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 at 26 {