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

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Message-ID: <20250920000619.2643457-3-bryan@bryanhinton.com>
Date: Fri, 19 Sep 2025 19:06:12 -0500
From: bryan@...anhinton.com
To: devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org
Cc: angelogioacchino.delregno@...labora.com,
	conor+dt@...nel.org,
	krzk+dt@...nel.org,
	matthias.bgg@...il.com,
	robh@...nel.org,
	Bryan Hinton <bryan@...anhinton.com>
Subject: [PATCH 2/2] arm64: dts: mediatek: mt7981b: OpenWrt One: set console UART to 115200

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@...anhinton.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@...00000 {
 		reg = <0 0x40000000 0 0x40000000>;
 		device_type = "memory";
 	};
 };
+
+&uart0 {
+	status = "okay";
+	current-speed = <115200>; /* 0x1c200 */
+};
-- 
2.51.0