硬件原理图

CAM_GPIO是摄像头电源控制引脚，连接芯片GPIO4_C2
CAM_LEDON是摄像头led灯控制引脚，连接芯片GPIO4_C3

编写设备树

/ {
	ext_cam_clk: external-camera-clock {
		compatible = "fixed-clock";
		clock-frequency = <25000000>;
		clock-output-names = "CLK_CAMERA_25MHZ";
		#clock-cells = <0>;
	};
}；

&pinctrl {
	camera {
		ov5647_default_pin: ov5647-default-pin {
			rockchip,pins =
			<4 RK_PC2 RK_FUNC_GPIO &pcfg_pull_none>,
			<4 RK_PC3 RK_FUNC_GPIO &pcfg_pull_up>;
		};
		ov5647_sleep_pin: ov5647-sleep-pin {
			rockchip,pins =
			//<4 RK_PB2