linux-kernel - [PATCH v2] ARM: dts: imx6ulz-bsh-smm-m2: fix resume via console

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Message-ID: <20250715141322.1305512-1-dario.binacchi@amarulasolutions.com>
Date: Tue, 15 Jul 2025 16:13:10 +0200
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: Peng Fan <peng.fan@....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 v2] ARM: dts: imx6ulz-bsh-smm-m2: fix resume via console

From: Wolfgang Birkner <wolfgang.birkner@...g.com>

Despite the current configuration being compliant with the technical
reference manual (TRM), testing on the system showed that resuming from
suspend via UART4 (used as the console) fails unless any other UART
is also enabled.

In our use case, UART2 is enabled to ensure reliable resume when UART4
is used as the console.

Signed-off-by: Wolfgang Birkner <wolfgang.birkner@...g.com>
Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

Changes in v2:
- Improve commit message
- Drop patches:
  - 1/3 ARM: dts: imx6ulz-bsh-smm-m2: Enable hardware rng
  - 3/3 ARM: dts: imx6ulz-bsh-smm-m2: Update wifi/bluetooth pinctrl

 arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts b/arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts
index 6159ed70d966..2d9f495660c9 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ulz-bsh-smm-m2.dts
@@ -33,6 +33,10 @@ &snvs_poweroff {
 	status = "okay";
 };
 
+&uart2 {
+	status = "okay";
+};
+
 &uart3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart3>;
-- 
2.43.0