[嵌入式]MTK camera设备树及相关驱动调试

1.cust_mt6771_camera.dtsi修改

这个设备树文件主要配置相机的reset，powerdown，avdd，dvdd，dovdd，clk引脚信息，已经配置了一些相机信息，我们调试时需要根据需求进行修改

reset和powerdown引脚配置

    camera_pins_cam0_rst_0: cam0@0 {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO101__FUNC_GPIO101>;
			slew-rate = <1>;
			output-low;
		};
	};
	camera_pins_cam0_rst_1: cam0@1 {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO101__FUNC_GPIO101>;
			slew-rate = <1>;
			output-high;
		};
	};
	camera_pins_cam0_pnd_0: cam0@2 {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO97__FUNC_GPIO97>;
			slew-rate = <1>;
			output-low;
		};
	};
	camera_pins_cam0_pnd_1: cam0@3 {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO97__FUNC_GPIO97>;
			slew-rate = <1>;
			output-high;
		};
	};

根据原理图配置相应引脚，一般默认0为主摄像头，1为前摄像头

avdd，dvdd，dovdd引脚配置

根据硬件原理图分析引脚是GPIO供电或系统供电

（这里示例配置avdd、dvddGPIO供电，dovdd系统供电）

GPIO供电：

	camera_pins_cam0_vcama_0: cam0@vcam0 {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO17__FUNC_GPIO17>;
			slew-rate = <1>;
			output-low;
		};
	};
	camera_pins_cam0_vcama_1: cam0@vcam1 {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO17__FUNC_GPIO17>;
			slew-rate = <1>;
			output-high;
		};
	};
	camera_pins_cam0_vcamd_0: cam0@vcam2 {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO178__FUNC_GPIO178>;
			slew-rate = <1>;
			output-low;
		};
	};
	camera_pins_cam0_vcamd_1: cam0@vcam3 {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO178__FUNC_GPIO178>;
			slew-rate = <1>;
			output-high;
		};
	};

系统供电：

?cam0_vcamio-supply = <&mt_pmic_vcamio_ldo_reg>;

clk引脚配置

    camera_pins_cam0_mclk_off: camera_pins_cam0_mclk_off {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO99__FUNC_GPIO99>;
			drive-strength = <1>;
		};
	};
	camera_pins_cam0_mclk_2ma: camera_pins_cam0_mclk_2ma {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO99__FUNC_CMMCLK0>;
			drive-strength = <0>;
		};
	};
	camera_pins_cam0_mclk_4ma: camera_pins_cam0_mclk_4ma {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO99__FUNC_CMMCLK0>;
			drive-strength = <1>;
		};
	};
	camera_pins_cam0_mclk_6ma: camera_pins_cam0_mclk_6ma {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO99__FUNC_CMMCLK0>;
			drive-strength = <2>;
		};
	};
	camera_pins_cam0_mclk_8ma: camera_pins_cam0_mclk_8ma {
		pins_cmd_dat {
			pinmux = <PINMUX_GPIO99__FUNC_CMMCLK0>;
			drive-strength = <3>;
		};
	};

硬件引脚关联配置

引脚配置的数量必须和上面配置的引脚一致，dws配置文件中相关GPIO模式设置正确；

&kd_camera_hw1 {
	pinctrl-names = "default",
			"cam0_rst0", "cam0_rst1",
			"cam0_pnd0", "cam0_pnd1",
			"cam1_rst0", "cam1_rst1",
			"cam1_pnd0", "cam1_pnd1",
			"cam2_rst0", "cam2_rst1",
			"cam2_pnd0", "cam2_pnd1",
			"cam0_ldo_vcama_0", "cam0_ldo_vcama_1",
			"cam0_ldo_vcamd_0", "cam0_ldo_vcamd_1",
			"cam2_ldo_vcamd_0", "cam2_ldo_vcamd_1",
			"cam2_ldo_vcama_0", "cam2_ldo_vcama_1",
			"cam0_mclk_off",
			"cam0_mclk_2mA", "cam0_mclk_4mA",
			"cam0_mclk_6mA", "cam0_mclk_8mA",
			"cam1_mclk_off",
			"cam1_mclk_2mA", "cam1_mclk_4mA",
			"cam1_mclk_6mA", "cam1_mclk_8mA",
			"cam2_mclk_off",
			"cam2_mclk_2mA", "cam2_mclk_4mA",
			"cam2_mclk_6mA", "cam2_mclk_8mA";
	pinctrl-0 = <&camera_pins_default>;
	pinctrl-1 = <&camera_pins_cam0_rst_0>;
	pinctrl-2 = <&camera_pins_cam0_rst_1>;
	pinctrl-3 = <&camera_pins_cam0_pnd_0>;
	......
	pinctrl-33 = <&camera_pins_cam2_mclk_4ma>;
	pinctrl-34 = <&camera_pins_cam2_mclk_6ma>;
	pinctrl-35 = <&camera_pins_cam2_mclk_8ma>;

	cam0_vcamio-supply = <&mt_pmic_vcamio_ldo_reg>;
	cam1_vcama-supply = <&mt_pmic_vcama2_ldo_reg>;
	cam1_vcamd-supply = <&mt_pmic_vcamd_ldo_reg>;
	cam1_vcamio-supply = <&mt_pmic_vcamio_ldo_reg>;
	cam2_vcamio-supply = <&mt_pmic_vcamio_ldo_reg>;

	status = "okay";
};

2.imgsensor_cfg_table.c文件配置

这个文件主要配置相机供电引脚(avdd,dvdd,dovdd)属性，根据硬件原理图判断：

GPIO控制的引脚使用宏：IMGSENSOR_HW_ID_GPIO

系统供电的引脚使用宏：IMGSENSOR_HW_ID_REGULATOR

其他引脚配置一般不变，cust_mt6771_camera.dtsi中的相机编号和这里的DEV_NO一一对应；

struct IMGSENSOR_HW_CFG imgsensor_custom_config[] = {
	{
		IMGSENSOR_SENSOR_IDX_MAIN,
		IMGSENSOR_I2C_DEV_0,
		{
			{IMGSENSOR_HW_PIN_MCLK,  IMGSENSOR_HW_ID_MCLK},
			{IMGSENSOR_HW_PIN_AVDD,  IMGSENSOR_HW_ID_GPIO},
			{IMGSENSOR_HW_PIN_DOVDD, IMGSENSOR_HW_ID_REGULATOR},
			{IMGSENSOR_HW_PIN_DVDD,  IMGSENSOR_HW_ID_GPIO},
			{IMGSENSOR_HW_PIN_PDN,   IMGSENSOR_HW_ID_GPIO},
			{IMGSENSOR_HW_PIN_RST,   IMGSENSOR_HW_ID_GPIO},
			{IMGSENSOR_HW_PIN_NONE,  IMGSENSOR_HW_ID_NONE},
		},
	},
	{
		IMGSENSOR_SENSOR_IDX_SUB,
		IMGSENSOR_I2C_DEV_1,
		{
			{IMGSENSOR_HW_PIN_MCLK,  IMGSENSOR_HW_ID_MCLK},
			{IMGSENSOR_HW_PIN_AVDD,  IMGSENSOR_HW_ID_REGULATOR},
			{IMGSENSOR_HW_PIN_DOVDD, IMGSENSOR_HW_ID_REGULATOR},
			{IMGSENSOR_HW_PIN_DVDD,  IMGSENSOR_HW_ID_REGULATOR},
			{IMGSENSOR_HW_PIN_PDN,   IMGSENSOR_HW_ID_GPIO},
			{IMGSENSOR_HW_PIN_RST,   IMGSENSOR_HW_ID_GPIO},
			{IMGSENSOR_HW_PIN_NONE, IMGSENSOR_HW_ID_NONE},
		},
	},
	{
		IMGSENSOR_SENSOR_IDX_MAIN2,
		IMGSENSOR_I2C_DEV_1,
		{
			......
		},
	},
	{
		IMGSENSOR_SENSOR_IDX_SUB2,
		IMGSENSOR_I2C_DEV_1,
		{
			......
		},
	},
	{
		IMGSENSOR_SENSOR_IDX_MAIN3,
		IMGSENSOR_I2C_DEV_1,
		{
			......
		},
	},

	{IMGSENSOR_SENSOR_IDX_NONE}
};