Enable OV5640 on NanoPi A64

 {
    model = "FriendlyARM ...";
    .
    .
    reg_vcc3v3: vcc3v3 {
        compatible = "regulator-fixed";
        regulator-name = "vcc3v3";
        regulator-min-microvolt = <3300000>;
        regulator-max-microvolt = <3300000>;
    };    
    
    cam_xclk: cam-xclk {
        #clock-cells = <0>;
        compatible = "fixed-clock";
        clock-frequency = <24000000>;
        clock-output-names = "cam-xclk";
    };

    reg_cam_avdd: cam-avdd {
        compatible = "regulator-fixed";
        regulator-name = "cam500b-avdd";
        regulator-min-microvolt = <2800000>;
        regulator-max-microvolt = <2800000>;
        vin-supply = <&reg_vcc3v3>;
    };

    reg_cam_dovdd: cam-dovdd {
        compatible = "regulator-fixed";
        regulator-name = "cam500b-dovdd";
        regulator-min-microvolt = <1800000>;
        regulator-max-microvolt = <1800000>;
        vin-supply = <&reg_vcc3v3>;
    };

    reg_cam_dvdd: cam-dvdd {
        compatible = "regulator-fixed";
        regulator-name = "cam500b-dvdd";
        regulator-min-microvolt = <1500000>;
        regulator-max-microvolt = <1500000>;
        vin-supply = <&reg_vcc3v3>;
    };    
    
    i2c {
        compatible = "i2c-gpio";
        sda-gpios = <&pio 4 13 GPIO_ACTIVE_HIGH>;
        scl-gpios = <&pio 4 12 GPIO_ACTIVE_HIGH>;
        i2c-gpio,delay-us = <5>;
        #address-cells = <1>;
        #size-cells = <0>;

        ov5640: camera@3c {
            compatible = "ovti,ov5640";
            reg = <0x3c>;
            pinctrl-names = "default";
            pinctrl-0 = <&csi_mclk_pin>;
            clocks = <&ccu CLK_CSI_MCLK>;
            clock-names = "xclk";

            
            AVDD-supply = <&reg_cam_avdd>;
            DOVDD-supply = <&reg_cam_dovdd>;
            DVDD-supply = <&reg_cam_dvdd>;
            reset-gpios = <&pio 4 16 GPIO_ACTIVE_LOW>; /* CSI-RST-R: PE16 */
            powerdown-gpios = <&pio 4 17 GPIO_ACTIVE_HIGH>; /* CSI-STBY-R: PE17 */

            port {
                ov5640_ep: endpoint {
                    remote-endpoint = <&csi_ep>;
                    bus-width = <8>;
                    hsync-active = <1>; /* Active high */
                    vsync-active = <0>; /* Active low */
                    data-active = <1>;  /* Active high */
                    pclk-sample = <1>;  /* Rising */
                };
            };
        };
    };
};
          
&csi {
	status = "okay";

	port {
		csi_ep: endpoint {
			remote-endpoint = <&ov5640_ep>;
			bus-width = <8>;
			hsync-active = <1>; /* Active high */
			vsync-active = <0>; /* Active low */
			data-active = <1>;  /* Active high */
			pclk-sample = <1>;  /* Rising */
		};
	};
};