arm64: dts: imx8mp: add imx8mp-venice-gw74xx-imx219 overlay for rpi v2 camera

Add support for the RaspberryPi Camera v2 which is an IMX219 8MP module:
 - https://datasheets.raspberrypi.com/camera/camera-v2-schematics.pdf
 - has its own on-board 24MHz osc so no clock required from baseboard
 - pin 11 enables 1.8V and 2.8V LDO which is connected to
   GW74xx MIPI_GPIO4 (IMX8MP GPIO1_IO4) so we use this as a gpio

Support is added via a device-tree overlay.

The IMX219 supports RAW8/RAW10 image formats.

Example configuration:
media-ctl -l "'imx219 3-0010':0->'csis-32e40000.csi':0[1]"
media-ctl -v -V "'imx219 3-0010':0 [fmt:SRGGB8/640x480 field:none]"
media-ctl -v -V "'crossbar':0 [fmt:SRGGB8/640x480 field:none]"
media-ctl -v -V "'mxc_isi.0':0 [fmt:SRGGB8/640x480 field:none]"
v4l2-ctl --set-fmt-video=width=640,height=480,pixelformat=RGGB
v4l2-ctl --stream-mmap --stream-to=frame.raw --stream-count=1
convert -size 640x480 -depth 8 gray:frame.raw frame.png
gst-launch-1.0 v4l2src ! \
  video/x-bayer,format=rggb,width=640,height=480,framerate=10/1 ! \
  bayer2rgb ! fbdevsink
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/Makefile

@@ -158,6 +158,7 @@ imx8mm-venice-gw73xx-0x-rpidsi-dtbs	:= imx8mm-venice-gw73xx-0x.dtb imx8mm-venice
 imx8mm-venice-gw73xx-0x-rs232-rts-dtbs	:= imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs232-rts.dtbo
 imx8mm-venice-gw73xx-0x-rs422-dtbs	:= imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs422.dtbo
 imx8mm-venice-gw73xx-0x-rs485-dtbs	:= imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs485.dtbo
+imx8mp-venice-gw74xx-imx219-dtbs	:= imx8mp-venice-gw74xx.dtb imx8mp-venice-gw74xx-imx219.dtbo
 imx8mp-venice-gw74xx-rpidsi-dtbs	:= imx8mp-venice-gw74xx.dtb imx8mp-venice-gw74xx-rpidsi.dtbo
 
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw72xx-0x-imx219.dtb
@@ -170,6 +171,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rpidsi.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs232-rts.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs422.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs485.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-venice-gw74xx-imx219.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-venice-gw74xx-rpidsi.dtb
 
 dtb-$(CONFIG_ARCH_S32) += s32g274a-evb.dtb

arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx-imx219.dtso

+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2023 Gateworks Corporation
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+
+#include "imx8mp-pinfunc.h"
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+	compatible = "gw,imx8mp-gw74xx", "fsl,imx8mp";
+
+	reg_cam: regulator-cam {
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_reg_cam>;
+		compatible = "regulator-fixed";
+		regulator-name = "reg_cam";
+		gpio = <&gpio1 4 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+	};
+
+	cam24m: cam24m {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <24000000>;
+		clock-output-names = "cam24m";
+	};
+};
+
+&i2c4 {
+	#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 = <&mipi_csi_0_in>;
+				clock-lanes = <0>;
+				data-lanes = <1 2>;
+				link-frequencies = /bits/ 64 <456000000>;
+			};
+		};
+	};
+};
+
+&isi_0 {
+	status = "okay";
+};
+
+&mipi_csi_0 {
+	status = "okay";
+
+	ports {
+		port@0 {
+			mipi_csi_0_in: endpoint {
+				remote-endpoint = <&imx219_to_mipi_csi2>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
+
+&iomuxc {
+	pinctrl_reg_cam: regcamgrp {
+		fsl,pins = <
+			MX8MP_IOMUXC_GPIO1_IO04__GPIO1_IO04	0x41
+		>;
+	};
+};