linux-kernel - [PATCH v2 01/15] arm64: dts: mediatek: mt7981b: Configure UART0 pinmux

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Message-Id: <20251101-openwrt-one-network-v2-1-2a162b9eea91@collabora.com>
Date: Sat, 01 Nov 2025 14:32:46 +0100
From: Sjoerd Simons <sjoerd@...labora.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Ryder Lee <ryder.lee@...iatek.com>, 
 Jianjun Wang <jianjun.wang@...iatek.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 Manivannan Sadhasivam <mani@...nel.org>, 
 Chunfeng Yun <chunfeng.yun@...iatek.com>, Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Lee Jones <lee@...nel.org>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Lorenzo Bianconi <lorenzo@...nel.org>, Felix Fietkau <nbd@....name>
Cc: kernel@...labora.com, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-pci@...r.kernel.org, 
 linux-phy@...ts.infradead.org, netdev@...r.kernel.org, 
 Daniel Golle <daniel@...rotopia.org>, Bryan Hinton <bryan@...anhinton.com>, 
 Sjoerd Simons <sjoerd@...labora.com>
Subject: [PATCH v2 01/15] arm64: dts: mediatek: mt7981b: Configure UART0
 pinmux

Add explicit pinctrl configuration for UART0

Signed-off-by: Sjoerd Simons <sjoerd@...labora.com>
---
V1 -> V2: Move pinctrl to the soc dtsi as it's the only available
          pinmux for the uart. And very rare for the pins to be used for
          anything else.
---
 arch/arm64/boot/dts/mediatek/mt7981b.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
index 58c99f2a25218..4fa35bbf0a9cd 100644
--- a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
@@ -102,6 +102,8 @@ uart0: serial@...02000 {
 			clocks = <&infracfg CLK_INFRA_UART0_SEL>,
 				 <&infracfg CLK_INFRA_UART0_CK>;
 			clock-names = "baud", "bus";
+			pinctrl-names = "default";
+			pinctrl-0 = <&uart0_pins>;
 			status = "disabled";
 		};

@@ -229,6 +231,13 @@ pio: pinctrl@...00000 {
 			gpio-controller;
 			#gpio-cells = <2>;
 			#interrupt-cells = <2>;
+
+			uart0_pins: uart0-pins {
+				mux {
+					function = "uart";
+					groups = "uart0";
+				};
+			};
 		};

 		efuse@...20000 {

-- 
2.51.0