ARM: dts: imx7d-pico-pi: add OV5645 camera support

Add OV5645 camera device node and enable relevant components in the
video capture data path, so output stream can be captured, and the
camera itself can be controlled over I2C bus.

This is roughly based on descriptions found in downstream kernel tree [1],
adapted to match upstream bindings.

Link: https://github.com/technexion-android/kernel_imx/blob/ce8fd74abf518dac0a09e8dcb37f3496f6375124/arch/arm/boot/dts/imx7d-pico.dtsi#L874 [1]

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

Author: Leo-PL

arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts

@@ -19,6 +19,13 @@
 		};
 	};
 
+	reg_1p5v: regulator-1p5v {
+		compatible = "regulator-fixed";
+		regulator-name = "1P5V";
+		regulator-min-microvolt = <1500000>;
+		regulator-max-microvolt = <1500000>;
+	};
+
 	sound {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "imx7-sgtl5000";
@@ -59,6 +66,33 @@
 		touchscreen-size-x = <800>;
 		touchscreen-size-y = <480>;
 	};
+
+	camera@3c {
+		compatible = "ovti,ov5645";
+		reg = <0x3c>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_camera>;
+
+		clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clock-rates = <24000000>;
+
+		enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+
+		vdda-supply = <&reg_2p5v>;
+		vdddo-supply = <&reg_vref_1v8>;
+		vddd-supply = <&reg_1p5v>;
+
+		port {
+			ov5645_to_mipi_csi2: endpoint {
+				remote-endpoint = <&mipi_csi2_in>;
+				clock-lanes = <0>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
 };
 
 &usdhc1 {
@@ -93,5 +127,37 @@
 			MX7D_PAD_EPDC_DATA13__GPIO2_IO13	0x14
 		>;
 	};
+};
+
+&iomuxc_lpsr {
+	pinctrl_camera: cameragrp {
+		fsl,pins = <
+			MX7D_PAD_LPSR_GPIO1_IO04__GPIO1_IO4	0x15
+			MX7D_PAD_LPSR_GPIO1_IO05__GPIO1_IO5	0x15
+			MX7D_PAD_LPSR_GPIO1_IO02__CCM_CLKO1	0x7d
+		>;
+	};
+};
+
+&csi {
+	status = "okay";
+};
+
+&mipi_csi {
+	status = "okay";
+
+	ports {
+		port@0 {
+			reg = <0>;
+
+			mipi_csi2_in: endpoint {
+				remote-endpoint = <&ov5645_to_mipi_csi2>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
 
+&video_mux {
+	status = "okay";
 };