[C61] add gpio expander PCA6416 support

arch/arm64/boot/dts/seco/seco-imx8mm-c61.dts

@@ -48,6 +48,17 @@
 		enable-active-high;
 	};
 
+	reg_gpio_exp_rst: gpio_exp_reset {
+		compatible = "regulator-fixed";
+		regulator-name = "GPIO_EXPANDER_RST";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&gpio4 21 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
 	sound-micfil {
 		compatible = "fsl,imx-audio-micfil";
 		model = "imx-audio-micfil";
@@ -270,6 +281,32 @@
 	status = "okay";
 };
 
+&i2c4 {
+	clock-frequency = <400000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c4>;
+	status = "okay";
+
+	pca6416_20: gpio@20 {
+		compatible = "nxp,pcal6416";
+		reg = <0x20>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_pca6416_20>;
+		interrupt-parent = <&gpio4>;
+		interrupts = <22 IRQ_TYPE_LEVEL_LOW>;
+	};
+
+	pca6416_21: gpio@21 {
+		compatible = "ti,tca6416";
+		reg = <0x21>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "", "blue_led", "red_led", "", "", "green_led";
+	};
+};
+
 &csi1_bridge {
 	fsl,mipi-mode;
 	status = "disabled";