arm64: dts: imx8mm-kontron: Add overlay for extension board

The extension board for the Kontron BL i.MX8MM provides additional
connectivity with the interfaces listed below. This change adds
support for some of these.

* M.2 PCIe Slot
* SIM Slot for M.2 Modems
* Raspberry Pi Pin Header
  * I2C
  * I2S/SAI
  * SDIO
  * SPI
  * UART
  * GPIOs
* QWIIC I2C Conenctor
* CSI Camera Connector
* USB Host

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>

arch/arm64/boot/dts/freescale/Makefile

@@ -117,6 +117,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-icore-mx8mm-edimm2.2.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-iot-gateway.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-innocomm-wb15-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-kontron-bl.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mm-kontron-bl-extension.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-kontron-bl-osm-s.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-mx8menlo.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-nitrogen-r2.dtb

arch/arm64/boot/dts/freescale/imx8m-kontron-bl-extension.dtsi

+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/*
+ * Copyright (C) 2023 Kontron Electronics GmbH
+ */
+
+#include <dt-bindings/clock/imx8mm-clock.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/phy/phy-imx8-pcie.h>
+#include "imx8mm-pinfunc.h"
+
+&{/} {
+	cam24m: cam24m {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <24000000>;
+		clock-output-names = "cam24m";
+	};
+
+	reg_cam: regulator-cam {
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_reg_cam>;
+		compatible = "regulator-fixed";
+		regulator-name = "reg_cam";
+		gpio = <&gpio3 9 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+	};
+};
+
+&csi {
+	status = "okay";
+};
+
+&i2c2 {
+	clock-frequency = <100000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_i2c2>;
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	imx219: sensor@10 {
+		compatible = "sony,imx219";
+		reg = <0x10>;
+		clocks = <&cam24m>;
+		VDIG-supply = <&reg_cam>;
+
+		port {
+			/* MIPI CSI-2 bus endpoint */
+			imx219_to_mipi_csi2: endpoint {
+				remote-endpoint = <&imx8mm_mipi_csi_in>;
+				clock-lanes = <0>;
+				data-lanes = <1 2>;
+				link-frequencies = /bits/ 64 <456000000>;
+			};
+		};
+	};
+};
+
+&mipi_csi {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+
+			imx8mm_mipi_csi_in: endpoint {
+				remote-endpoint = <&imx219_to_mipi_csi2>;
+				clock-lanes = <0>;
+				data-lanes = <1 2>;
+			};
+		};
+
+		port@1 {
+			reg = <1>;
+
+			imx8mm_mipi_csi_out: endpoint {
+				remote-endpoint = <&csi_in>;
+			};
+		};
+	};
+};
+
+&pcie_phy {
+	fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_OUTPUT>;
+	fsl,clkreq-unsupported;
+	status = "okay";
+};
+
+&pcie0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pcie0>;
+	reset-gpio = <&gpio3 0 GPIO_ACTIVE_LOW>;
+	clocks = <&clk IMX8MM_CLK_PCIE1_ROOT>, <&clk IMX8MM_CLK_PCIE1_AUX>,
+		 <&clk IMX8MM_CLK_PCIE1_PHY>;
+	clock-names = "pcie", "pcie_aux", "pcie_bus";
+	assigned-clocks = <&clk IMX8MM_CLK_PCIE1_AUX>,
+			  <&clk IMX8MM_CLK_PCIE1_CTRL>;
+	assigned-clock-rates = <10000000>, <250000000>;
+	assigned-clock-parents = <&clk IMX8MM_SYS_PLL2_50M>,
+				 <&clk IMX8MM_SYS_PLL2_250M>;
+	vph-supply = <&reg_vdda>;
+	status = "okay";
+};
+
+&iomuxc {
+	pinctrl_i2c2: i2c2grp {
+		fsl,pins = <
+			MX8MM_IOMUXC_I2C2_SCL_I2C2_SCL			0x400001c3
+			MX8MM_IOMUXC_I2C2_SDA_I2C2_SDA			0x400001c3
+		>;
+	};
+};

arch/arm64/boot/dts/freescale/imx8mm-kontron-bl-extension.dts

+// SPDX-License-Identifier: GPL-2.0+ OR MIT
+/*
+ * Copyright (C) 2023 Kontron Electronics GmbH
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include "imx8mm-pinfunc.h"
+#include "imx8m-kontron-bl-extension.dtsi"
+
+&{/} {
+	compatible = "kontron,imx8mm-bl", "kontron,imx8mm-sl", "fsl,imx8mm";
+};
+
+&iomuxc {
+	pinctrl_pcie0: pcie0grp {
+		fsl,pins = <
+			MX8MM_IOMUXC_NAND_ALE_GPIO3_IO0		0x41
+		>;
+	};
+
+	pinctrl_reg_cam: regcamgrp {
+		fsl,pins = <
+			MX8MM_IOMUXC_NAND_DATA03_GPIO3_IO9	0x41
+		>;
+	};
+};