修改设备树中的以下内容,就为i.MX6的i2c1增加了i2c恢复功能。

diff --git a/arch/arm/boot/dts/imx6qdl-phytec-mira.dtsi b/arch/arm/boot/dts/imx6qdl-phytec-mira.dtsi
index 2e4dae8..79f3152 100644
--- a/arch/arm/boot/dts/imx6qdl-phytec-mira.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-phytec-mira.dtsi
@@ -200,8 +200,11 @@
 };
 
 &i2c1 {
-	pinctrl-names = "default";
+	pinctrl-names = "default","gpio";
 	pinctrl-0 = <&pinctrl_i2c1>;
+	pinctrl-1 = <&pinctrl_i2c1_gpio>;
+	scl-gpios = <&gpio3 21 GPIO_ACTIVE_HIGH>;
+	sda-gpios = <&gpio3 28 GPIO_ACTIVE_HIGH>;
 	clock-frequency = <100000>;
 	status = "disabled";
 
@@ -604,6 +607,13 @@
 		>;
 	};
 
+	pinctrl_i2c1_gpio: i2c1gpiogrp {
+		fsl,pins = <
+			MX6QDL_PAD_EIM_D21__GPIO3_IO21		0x4001b8b1
+			MX6QDL_PAD_EIM_D28__GPIO3_IO28		0x4001b8b1
+		>;
+	};
+
 	pinctrl_pcie: pciegrp {
 		fsl,pins = <
 			MX6QDL_PAD_EIM_OE__GPIO2_IO25		0xb0b1

需要注意的是不同的i2c接口需要单独配置io口。