$ vi /etc/sysctl.conf

#
# /etc/sysctl.conf - Configuration file for setting system variables
# See /etc/sysctl.d/ for additional system variables.
# See sysctl.conf (5) for information.
##kernel.domainname = example.com# Uncomment the following to stop low-level messages on console
kernel.printk = 8 8 8 8                #打印等级###################################################################
# Functions previously found in netbase
## Uncomment the next two lines to enable Spoof protection (reverse-path filter)
# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks
#net.ipv4.conf.default.rp_filter=1
#net.ipv4.conf.all.rp_filter=1# Uncomment the next line to enable TCP/IP SYN cookies
# See http://lwn.net/Articles/277146/

$ i2cdetect -r -y 2

• compatible = "ridgerun,imx415" 要和imx415驱动对应上

• mclk_khz：imx415模块外接 37.125M晶振，因此 mclk_khz = "37125"

• 4 lane模式：因此 num_lanes = "4"， bus-width = <4>;

• CSI2：因此 tegra_sinterface = "serial_c"，port-index = <2>

• 分辨率：根据 imx415分辨率设置 "active_w = 3864"，active_h = "2192"

• pixel_phase：像素格式，pixel_phase = "gbrg"，调试时设置为 "rggb" 导致图像偏红色

• csi_pixel_bit_depth：像素深度，imx415使用RAW12模式，因此 csi_pixel_bit_depth = "12"

• pix_clk_hz：imx415 配置 lane频率为 891 Mbps，4lane，像素深度为12bit，pix_clk_hz = 891 Mbps × 4 / 12 = 297000000，我理解只要不小于此值即可。

• mclk_multiplier ：mclk_multiplier  ≥ pix_clk_hz / mclk = 297000000 / 37125000 = 8，因此mclk_multiplier = "8"。从nvidia官方手册可知，mclk_multiplier 必须大于等于pix_clk_hz / mclk，以确保ISP运行得足够快，能够处理来自传感器的数据。

• 增益，查看imx415手册

 GAIN_PCG_0计算公式：GAIN_PCG_0 = Gain[dB] x 10 /3

GAIN_PCG_0 范围为 0 - 240d，因此 Gain范围为  0 - 72 [dB]，我这里增益因子配置为 gain_factor = "10" ，Gain范围 0 - 72 [dB] 乘上增益因子，得到 min_gain_val = "0"， max_gain_val = "720"，step为 0.3dB 乘增益因子，因此 step_gain_val = "3"

• 曝光：

曝光参数单位为us，需要根据帧率（30fps）、VMAX（2250）、 SHR0 值范围（8 到 Number oflines per frame - 4），按照下面公式倒推 exposure 最小值、最大值、step，我算得结果图下：

min_exp_time = "15";        /* 单位：us */
max_exp_time = "33214";     /* 单位：us */
step_exp_time = "15";       /* 单位：us */

• embedded_metadata_height：根据imx415手册来配置为 "1"，如下图

// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.///dts-v1/;
///plugin/;#define CAM0_RST	TEGRA234_MAIN_GPIO(Q, 6)	/* add */
#define CAM0_PWDN	TEGRA234_MAIN_GPIO(H, 6)
#define CAM1_PWDN	TEGRA234_MAIN_GPIO(AC, 0)
#define CAM_I2C_MUX 	TEGRA234_AON_GPIO(CC, 3)#include <dt-bindings/tegra234-p3767-0000-common.h>/ {overlay-name = "Camera IMX415-C 4 lane";jetson-header-name = "Jetson 24pin CSI Connector";compatible = JETSON_COMPATIBLE_P3768;/*IMX415 connected on cam0 port */fragment@0 {target-path = "/";__overlay__ {tegra-capture-vi  {num-channels = <1>;ports {#address-cells = <1>;#size-cells = <0>;port@0 {reg = <0>;rbpcv3_imx415_vi_in1: endpoint {port-index = <2>;bus-width = <4>;remote-endpoint = <&rbpcv3_imx415_csi_out1>;};};};};tegra-camera-platform {compatible = "nvidia, tegra-camera-platform";/*** Physical settings to calculate max ISO BW** num_csi_lanes = <>;* Total number of CSI lanes when all cameras are active** max_lane_speed = <>;* Max lane speed in Kbit/s** min_bits_per_pixel = <>;* Min bits per pixel** vi_peak_byte_per_pixel = <>;* Max byte per pixel for the VI ISO case** vi_bw_margin_pct = <>;* Vi bandwidth margin in percentage** max_pixel_rate = <>;* Max pixel rate in Kpixel/s for the ISP ISO case** isp_peak_byte_per_pixel = <>;* Max byte per pixel for the ISP ISO case** isp_bw_margin_pct = <>;* Isp bandwidth margin in percentage*/num_csi_lanes = <4>;max_lane_speed = <1500000>;min_bits_per_pixel = <10>;vi_peak_byte_per_pixel = <2>;vi_bw_margin_pct = <25>;max_pixel_rate = <7500000>;isp_peak_byte_per_pixel = <5>;isp_bw_margin_pct = <25>;/*** The general guideline for naming badge_info contains 3 parts, and is as follows,* The first part is the camera_board_id for the module; if the module is in a FFD* platform, then use the platform name for this part.* The second part contains the position of the module, ex. "rear" or "front".* The third part contains the last 6 characters of a part number which is found* in the module's specsheet from the vendor.*/modules {module1 {badge = "jakku_rear_RBPCV3";position = "rear";orientation = "1";drivernode0 {pcl_id = "v4l2_sensor";sysfs-device-tree = "/sys/firmware/devicetree/base/bus@0/cam_i2cmux/i2c@1/rbpcv3_imx415_c@1a";};};};};bus@0 {host1x@13e00000 {nvcsi@15a00000 {num-channels = <1>;#address-cells = <1>;#size-cells = <0>;channel@0 {reg = <0>;ports {#address-cells = <1>;#size-cells = <0>;port@0 {reg = <0>;rbpcv3_imx415_csi_in1: endpoint@0 {port-index = <2>;bus-width = <4>;remote-endpoint = <&rbpcv3_imx415_out1>;};};port@1 {reg = <1>;rbpcv3_imx415_csi_out1: endpoint@1 {remote-endpoint = <&rbpcv3_imx415_vi_in1>;};};};};};};cam_i2cmux {status = "okay";compatible = "i2c-mux-gpio";#address-cells = <1>;#size-cells = <0>;mux-gpios = <&gpio_aon CAM_I2C_MUX GPIO_ACTIVE_HIGH>;i2c-parent = <&cam_i2c>;i2c@0 {rbpcv2_imx219_a@10 {status = "disabled";};};i2c@1 {status = "okay";reg = <1>;#address-cells = <1>;#size-cells = <0>;rbpcv2_imx219_c@10 {status = "disabled";};rbpcv3_imx415_c@1a {reset-gpios = <&gpio CAM1_PWDN GPIO_ACTIVE_HIGH>;compatible = "ridgerun,imx415";/* I2C device address */reg = <0x1a>;/* V4L2 device node location */devnode = "video0";/* Physical dimensions of sensor */physical_w = "9.3";physical_h = "4.65";sensor_model = "imx415";use_sensor_mode_id = "true";mode0 { /* IMX415_MODE_3864x2192 */mclk_khz = "37125";	//"24000";num_lanes = "4";tegra_sinterface = "serial_c";phy_mode = "DPHY";discontinuous_clk = "no";dpcm_enable = "false";cil_settletime = "0";		// 0表示自动校准 lane_polarity = "0";active_w = "3864";active_h = "2192";mode_type = "bayer";pixel_phase = "gbrg";	//"rggb";csi_pixel_bit_depth = "12";	//12readout_orientation = "0";	//90line_length = "4400";	//0x08CA "11200";inherent_gain = "1";mclk_multiplier = "8";		//pix_clk_hz / mclk_khz = 297000000 / 37125000 = 8pix_clk_hz = "297000000";	//891 Mbps × 4 / 12gain_factor = "10";framerate_factor = "1000000";exposure_factor = "1000000";min_gain_val = "0";	/* 0dB */max_gain_val = "720";	/* 72dB */step_gain_val = "3";	/* 0.3dB step */default_gain = "10";	/* 1dB */min_hdr_ratio = "1";max_hdr_ratio = "1";min_framerate = "2000000"; /* 2.0 fps */max_framerate = "60000000";	//"30000000"; /* 30.0 fps */step_framerate = "1";default_framerate = "30000000"; /* 30.0 fps */min_exp_time = "15";		/* us, 1H时间 = line_length / pix_clk_hz */max_exp_time = "33214";	//"33334";		/* us */step_exp_time = "15";default_exp_time = "5000";	/* us */embedded_metadata_height = "1";	set_mode_delay_ms = "500";                      //dongao 等待8帧};mode1 { /* IMX415_MODE_3864x2192 */mclk_khz = "37125";	//"24000";num_lanes = "4";tegra_sinterface = "serial_c";phy_mode = "DPHY";discontinuous_clk = "no";dpcm_enable = "false";cil_settletime = "0";		// 0表示自动校准 lane_polarity = "0";active_w = "3864";active_h = "2192";mode_type = "bayer";pixel_phase = "gbrg";	//"rggb";csi_pixel_bit_depth = "12";	//10readout_orientation = "0";	//90line_length = "4400";	//0x08CA "11200";inherent_gain = "1";mclk_multiplier = "8";pix_clk_hz = "297000000";		//"356400000";gain_factor = "10";framerate_factor = "1000000";exposure_factor = "1000000";min_gain_val = "0";	/* 0dB */max_gain_val = "720";	/* 72dB */step_gain_val = "3";	/* 0.3dB step */default_gain = "10";	/* 1dB */min_hdr_ratio = "1";max_hdr_ratio = "1";min_framerate = "2000000"; /* 2.0 fps */max_framerate = "60000000"; /* 60.0 fps */step_framerate = "1";default_framerate = "30000000"; /* 60.0 fps */min_exp_time = "15"; /* us */max_exp_time = "33214"; /* us */step_exp_time = "15";default_exp_time = "5000"; /* us */embedded_metadata_height = "1";};ports {#address-cells = <1>;#size-cells = <0>;port@0 {reg = <0>;rbpcv3_imx415_out1: endpoint {port-index = <2>;bus-width = <4>;remote-endpoint = <&rbpcv3_imx415_csi_in1>;};};};};};};gpio@2200000 {                  //addcamera-control-output-low {gpio-hog;output-low;gpios = <CAM0_RST 0>;label = "cam0-rst";};};gpio@6000d000 {camera-control-output-low {gpio-hog;output-low;gpios = <CAM1_PWDN 0  CAM0_PWDN 0>;label = "cam1-pwdn", "cam0-pwdn";};};};};};
};

// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES.  All rights reserved./dts-v1/;
/plugin/;/ {overlay-name = "Tegra234 p3768-0000+p3767-xxxx Dynamic Overlay";
};/** Include this file last in the device tree.  It manages run-time*