linux-kernel - [PATCH 5/9] arm64: dts: imx8mn-bsh-smm-s2-common: Pull Up Console UART pins

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Message-ID: <20250514082507.1983849-6-dario.binacchi@amarulasolutions.com>
Date: Wed, 14 May 2025 10:24:59 +0200
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: Simon Holesch <simon.holesch@...g.com>,
	Karthikdatt Anantharamrao <karthikdatt.anantharamrao@...bosch.com>,
	michael@...rulasolutions.com,
	linux-amarula@...rulasolutions.com,
	Wolfgang Birkner <wolfgang.birkner@...g.com>,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Fabio Estevam <festevam@...il.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 5/9] arm64: dts: imx8mn-bsh-smm-s2-common: Pull Up Console UART pins

From: Simon Holesch <simon.holesch@...g.com>

The UART pins are floating, if nothing is connected. This can trigger a
Magic SysRq (e.g. reset).

Signed-off-by: Simon Holesch <simon.holesch@...g.com>
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

 arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
index de70cd3a392f..fd12b97525d1 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
@@ -386,8 +386,8 @@ MX8MN_IOMUXC_ECSPI1_SS0_UART3_DCE_RTS_B		0x040
 
 	pinctrl_uart4: uart4grp {
 		fsl,pins = <
-			MX8MN_IOMUXC_UART4_RXD_UART4_DCE_RX		0x040
-			MX8MN_IOMUXC_UART4_TXD_UART4_DCE_TX		0x040
+			MX8MN_IOMUXC_UART4_RXD_UART4_DCE_RX		0x140
+			MX8MN_IOMUXC_UART4_TXD_UART4_DCE_TX		0x140
 		>;
 	};
 
-- 
2.43.0