linux-kernel - [PATCH 1/6] arm64: dts: imx8mq-librem5: Enable I2C recovery

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Message-Id: <20260105-l5-dtb-fixes-v1-1-f491881a7fe7@puri.sm>
Date: Mon, 05 Jan 2026 21:39:38 +0100
From: Sebastian Krzyszkowiak via B4 Relay <devnull+sebastian.krzyszkowiak.puri.sm@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 kernel@...i.sm, Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>, 
 Denis Sergeevich <galilley@...il.com>
Subject: [PATCH 1/6] arm64: dts: imx8mq-librem5: Enable I2C recovery

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>

i2c-imx can perform bus recovery by temporarily switching I2C pins
into GPIO mode. To do so, it needs GPIO and pinctrl handles to be
provided in the device tree.

Suggested-by: Denis Sergeevich <galilley@...il.com>
Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 48 +++++++++++++++++++++--
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index 9e0e2d7271ef..ce039bd701c2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -512,6 +512,13 @@ MX8MQ_IOMUXC_I2C1_SDA_I2C1_SDA		0x40000026
 		>;
 	};
 
+	pinctrl_i2c1_gpio: i2c1-gpiogrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C1_SCL_GPIO5_IO14	0x26
+			MX8MQ_IOMUXC_I2C1_SDA_GPIO5_IO15	0x26
+		>;
+	};
+
 	pinctrl_i2c2: i2c2grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_I2C2_SCL_I2C2_SCL		0x40000026
@@ -519,6 +526,13 @@ MX8MQ_IOMUXC_I2C2_SDA_I2C2_SDA		0x40000026
 		>;
 	};
 
+	pinctrl_i2c2_gpio: i2c2-gpiogrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C2_SCL_GPIO5_IO16	0x26
+			MX8MQ_IOMUXC_I2C2_SDA_GPIO5_IO17	0x26
+		>;
+	};
+
 	pinctrl_i2c3: i2c3grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_I2C3_SCL_I2C3_SCL		0x40000026
@@ -526,6 +540,13 @@ MX8MQ_IOMUXC_I2C3_SDA_I2C3_SDA		0x40000026
 		>;
 	};
 
+	pinctrl_i2c3_gpio: i2c3-gpiogrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C3_SCL_GPIO5_IO18	0x26
+			MX8MQ_IOMUXC_I2C3_SDA_GPIO5_IO19	0x26
+		>;
+	};
+
 	pinctrl_i2c4: i2c4grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_I2C4_SCL_I2C4_SCL		0x40000026
@@ -533,6 +554,13 @@ MX8MQ_IOMUXC_I2C4_SDA_I2C4_SDA		0x40000026
 		>;
 	};
 
+	pinctrl_i2c4_gpio: i2c4-gpiogrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C4_SCL_GPIO5_IO20	0x26
+			MX8MQ_IOMUXC_I2C4_SDA_GPIO5_IO21	0x26
+		>;
+	};
+
 	pinctrl_keys: keysgrp {
 		fsl,pins = <
 			/* VOL- */
@@ -782,8 +810,11 @@ MX8MQ_IOMUXC_GPIO1_IO02_WDOG1_WDOG_B	0x1f
 
 &i2c1 {
 	clock-frequency = <384000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c1>;
+	pinctrl-1 = <&pinctrl_i2c1_gpio>;
+	scl-gpios = <&gpio5 14 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 15 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	typec_pd: usb-pd@3f {
@@ -982,8 +1013,11 @@ rtc@68 {
 
 &i2c2 {
 	clock-frequency = <384000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c2>;
+	pinctrl-1 = <&pinctrl_i2c2_gpio>;
+	scl-gpios = <&gpio5 16 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 17 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	magnetometer: magnetometer@1e	{
@@ -1031,8 +1065,11 @@ accel_gyro: accel-gyro@6a	{
 
 &i2c3 {
 	clock-frequency = <384000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c3>;
+	pinctrl-1 = <&pinctrl_i2c3_gpio>;
+	scl-gpios = <&gpio5 18 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 19 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	codec: audio-codec@1a {
@@ -1121,8 +1158,11 @@ touchscreen@38 {
 
 &i2c4 {
 	clock-frequency = <384000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c4>;
+	pinctrl-1 = <&pinctrl_i2c4_gpio>;
+	scl-gpios = <&gpio5 20 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 21 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	vcm@c {

-- 
2.52.0