linux-kernel - [PATCH] arm64: dts: freescale: imx93-phy{core,board}: Add i2c bus recovery

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Message-Id: <20251023103426.3606647-1-primoz.fiser@norik.com>
Date: Thu, 23 Oct 2025 12:34:26 +0200
From: Primoz Fiser <primoz.fiser@...ik.com>
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,
	upstream@...ts.phytec.de
Subject: [PATCH] arm64: dts: freescale: imx93-phy{core,board}: Add i2c bus recovery

Add bus recovery feature for I2C buses on the PHYTEC phyCORE-i.MX93 SoM
based boards (that is phyBOARD-Nash-i.MX93 and phyBOARD-Segin-i.MX93).
This enables the i2c-imx-lpi2c driver to recover the stuck I2C bus by
switching the SCL and SDA pinmuxing and do the I2C bus bit-banging.

Signed-off-by: Primoz Fiser <primoz.fiser@...ik.com>
---
 .../arm64/boot/dts/freescale/imx93-phyboard-nash.dts | 12 +++++++++++-
 .../boot/dts/freescale/imx93-phyboard-segin.dts      | 12 +++++++++++-
 arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi | 12 +++++++++++-
 3 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
index 5599e296919f..96c58cf13754 100644
--- a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash.dts
@@ -128,8 +128,11 @@ &flexcan1 {
 /* I2C2 */
 &lpi2c2 {
 	clock-frequency = <400000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_lpi2c2>;
+	pinctrl-1 = <&pinctrl_lpi2c2_gpio>;
+	scl-gpios = <&gpio1 2 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio1 3 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	/* RTC */
@@ -253,6 +256,13 @@ MX93_PAD_I2C2_SDA__LPI2C2_SDA		0x40000b9e
 		>;
 	};
 
+	pinctrl_lpi2c2_gpio: lpi2c2gpiogrp {
+		fsl,pins = <
+			MX93_PAD_I2C2_SCL__GPIO1_IO02		0x31e
+			MX93_PAD_I2C2_SDA__GPIO1_IO03		0x31e
+		>;
+	};
+
 	pinctrl_lpspi6: lpspi6grp {
 		fsl,pins = <
 			MX93_PAD_GPIO_IO00__GPIO2_IO00		0x386
diff --git a/arch/arm64/boot/dts/freescale/imx93-phyboard-segin.dts b/arch/arm64/boot/dts/freescale/imx93-phyboard-segin.dts
index 802d96b19e4c..1850a93dbaa4 100644
--- a/arch/arm64/boot/dts/freescale/imx93-phyboard-segin.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-phyboard-segin.dts
@@ -132,8 +132,11 @@ &flexcan1 {
 /* I2C2 */
 &lpi2c2 {
 	clock-frequency = <400000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_lpi2c2>;
+	pinctrl-1 = <&pinctrl_lpi2c2_gpio>;
+	scl-gpios = <&gpio1 2 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio1 3 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	/* Codec */
@@ -238,6 +241,13 @@ MX93_PAD_I2C2_SDA__LPI2C2_SDA		0x40000b9e
 		>;
 	};
 
+	pinctrl_lpi2c2_gpio: lpi2c2gpiogrp {
+		fsl,pins = <
+			MX93_PAD_I2C2_SCL__GPIO1_IO02		0x31e
+			MX93_PAD_I2C2_SDA__GPIO1_IO03		0x31e
+		>;
+	};
+
 	pinctrl_reg_usdhc2_vmmc: regusdhc2vmmcgrp {
 		fsl,pins = <
 			MX93_PAD_SD2_RESET_B__GPIO3_IO07	0x31e
diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
index 3f069905cf0b..ebc57841f27f 100644
--- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
@@ -93,8 +93,11 @@ ethphy1: ethernet-phy@1 {
 /* I2C3 */
 &lpi2c3 {
 	clock-frequency = <400000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_lpi2c3>;
+	pinctrl-1 = <&pinctrl_lpi2c3_gpio>;
+	scl-gpios = <&gpio2 29 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio2 28 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	pmic@25 {
@@ -234,6 +237,13 @@ MX93_PAD_GPIO_IO29__LPI2C3_SCL		0x40000b9e
 		>;
 	};
 
+	pinctrl_lpi2c3_gpio: lpi2c3gpiogrp {
+		fsl,pins = <
+			MX93_PAD_GPIO_IO28__GPIO2_IO28		0x31e
+			MX93_PAD_GPIO_IO29__GPIO2_IO29		0x31e
+		>;
+	};
+
 	pinctrl_pmic: pmicgrp {
 		fsl,pins = <
 			MX93_PAD_ENET2_RD3__GPIO4_IO27		0x31e
-- 
2.34.1