[PATCH 2/2] arm64: dts: mediatek: mt7981b: OpenWrt One: set console UART to 115200

[bryan@bryanhinton.com]

Use the new uart0 label for the console and make the speed explicit by
adding current-speed = <115200>. This keeps the DTS OS-agnostic: no
bootargs or distribution-specific properties are added.

Verification: Boot-tested with mainline Image+DTB via U-Boot on OpenWrt
One (MT7981B). Serial console active at 115200 baud, and DTB decompile
confirms serial0 alias and stdout-path set correctly.

Signed-off-by: Bryan Hinton <bryan@bryanhinton.com>
---
 .../arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts b/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
index 4f6cbb491287..1d2c3a21019c 100644
--- a/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
@@ -8,8 +8,21 @@ / {
 	compatible = "openwrt,one", "mediatek,mt7981b";
 	model = "OpenWrt One";
 
+	aliases {
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
 	memory@40000000 {
 		reg = <0 0x40000000 0 0x40000000>;
 		device_type = "memory";
 	};
 };
+
+&uart0 {
+	status = "okay";
+	current-speed = <115200>; /* 0x1c200 */
+};
-- 
2.51.0