arm64: dts: imx8qxp-mek: Add i2c1 with pca9646

Add an initial description of the i2c1 bus with a pca9646 i2c switch and
various gpio expanders and sensors behind that. Only add the sensors
which already have upstream drivers.

According to the datasheet the pca9646 is software compatible with
pca9546 so no driver changes should be required.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8qxp-mek.dts

@@ -60,6 +60,82 @@ ethphy1: ethernet-phy@1 {
 	};
 };
 
+&adma_i2c1 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	clock-frequency = <100000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lpi2c1 &pinctrl_ioexp_rst>;
+	status = "okay";
+
+	i2c-switch@71 {
+		compatible = "nxp,pca9646", "nxp,pca9546";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0x71>;
+		reset-gpios = <&lsio_gpio1 1 GPIO_ACTIVE_LOW>;
+
+		i2c@0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0>;
+
+			max7322: gpio@68 {
+				compatible = "maxim,max7322";
+				reg = <0x68>;
+				gpio-controller;
+				#gpio-cells = <2>;
+			};
+		};
+
+		i2c@1 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <1>;
+		};
+
+		i2c@2 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <2>;
+
+			pressure-sensor@60 {
+				compatible = "fsl,mpl3115";
+				reg = <0x60>;
+			};
+		};
+
+		i2c@3 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <3>;
+
+			pca9557_a: gpio@1a {
+				compatible = "nxp,pca9557";
+				reg = <0x1a>;
+				gpio-controller;
+				#gpio-cells = <2>;
+			};
+
+			pca9557_b: gpio@1d {
+				compatible = "nxp,pca9557";
+				reg = <0x1d>;
+				gpio-controller;
+				#gpio-cells = <2>;
+			};
+
+			light-sensor@44 {
+				pinctrl-names = "default";
+				pinctrl-0 = <&pinctrl_isl29023>;
+				compatible = "isil,isl29023";
+				reg = <0x44>;
+				interrupt-parent = <&lsio_gpio1>;
+				interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+			};
+		};
+	};
+};
+
 &usdhc1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_usdhc1>;
@@ -100,6 +176,25 @@ IMX8QXP_ENET0_RGMII_RXD3_CONN_ENET0_RGMII_RXD3		0x06000020
 		>;
 	};
 
+	pinctrl_ioexp_rst: ioexp_rst_grp {
+		fsl,pins = <
+			IMX8QXP_SPI2_SDO_LSIO_GPIO1_IO01			0x06000021
+		>;
+	};
+
+	pinctrl_isl29023: isl29023grp {
+		fsl,pins = <
+			IMX8QXP_SPI2_SDI_LSIO_GPIO1_IO02			0x00000021
+		>;
+	};
+
+	pinctrl_lpi2c1: lpi2c1grp {
+		fsl,pins = <
+			IMX8QXP_USB_SS3_TC1_ADMA_I2C1_SCL			0x06000021
+			IMX8QXP_USB_SS3_TC3_ADMA_I2C1_SDA			0x06000021
+		>;
+	};
+
 	pinctrl_lpuart0: lpuart0grp {
 		fsl,pins = <
 			IMX8QXP_UART0_RX_ADMA_UART0_RX				0x06000020