qcom camera bring up
尝试点亮前摄camera，平台SDM450，android 8.0，sensor型号：hi846
本次只是点亮camera，并不包含马达，eeprom驱动等
kernel修改文件比较少，一般只修改一个文件
arch/arm/boot/dts/qcom/msm8953-camera-sensor-mtp.dtsi
想要具体确定修改哪个文件，一般定义在文件kernel/msm-3.18/include/soc/qcom/socinfo.h
或者kernel/msm-3.18/arch/arm/boot/dts/qcom/sdm450-pmiXXX.dts
添加代码：这里包括电源，时钟，管脚等的配置
qcom,camera@1{
cell-index = <2>;
compatible = "qcom,camera";
reg = <0x01>;
qcom,csiphy-sd-index = <1>;
qcom,csid-sd-index = <1>;
qcom,mount-angle = <90>; //camera角度
cam_vdig-supply = <&pm8953_l23>; //camera vdig对应管脚
cam_vio-supply = <&pm8953_l6>; //camera vio 对应管脚
cam_vana-supply = <&pm8953_l22>; //camera vana 对应管脚，这戏管脚的具体对应需要查询硬件手册
cam_vaf-supply = <&pm8953_l17>;
qcom,cam-vreg-name = "cam_vdig", "cam_vio", "cam_vana",
"cam_vaf";
qcom,cam-vreg-min-voltage = <1175000 0 2800000 2850000>;
qcom,cam-vreg-max-voltage = <1175000 0 2800000 2850000>; //配置每个管脚的典雅范围
qcom,cam-vreg-op-mode = <105000 0 80000 100000>;
qcom,gpio-no-mux = <0>;
pinctrl-names = "cam_default", "cam_suspend";
pinctrl-0 = <&cam_sensor_mclk1_default
&cam_sensor_front1_default>;
pinctrl-1 = <&cam_sensor_mclk1_sleep
&cam_sensor_front1_sleep>;
gpios = <&tlmm 27 0>,
<&tlmm 129 0>,
<&tlmm 130 0>;
qcom,gpio-reset = <1>;
qcom,gpio-standby = <2>; //配置对应gpio口
qcom,gpio-req-tbl-num = <0 1 2>;
qcom,gpio-req-tbl-flags = <1 0 0>;
qcom,gpio-req-tbl-label = "CAMIF_MCLK2",
"CAM_RESET2",
"CAM_STANDBY2";
qcom,sensor-position = <0>;
qcom,sensor-mode = <0>;
qcom,cci-master = <1>;
status = "ok";
clocks = <&clock_gcc clk_mclk1_clk_src>,
<&clock_gcc clk_gcc_camss_mclk1_clk>;
clock-names = "cam_src_clk", "cam_clk";
qcom,clock-rates = <24000000 0>; //配置对应时钟
};
vendor目录下的修改：
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/configs/msm8953_camera.xml
添加代码：这里对应的是camera的基础配置信息，包含name position MountAngle lens等
添加文件：（与上述配置对应）
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/configs/hi846_chromatix.xml
这里配置了所需要的chromatix资料，对应不同型号模组，一般修改名字就可以了
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/configs/Android.mk
这里需要把hi846_chromatix.xml添加进android.mk，否则就不会被编译进系统
添加驱动文件：
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/sensor/libs/hi846/
驱动文件的配置信息参考：https://blog.csdn.net/wing12345678910/article/details/79586264
具体的驱动文件内容就需要和供应商确定如何获得了。如果实在没有可参考其他型号模组驱动，自己尝试写一下
添加效果配置文件：
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/chromatix/0309/chromatix_hi846
该目录下对应的是不同模式下的效果配置，同样需要供应商沟通获得
vendor/qcom/proprietory/common/config/device-vendor.mk
添加所有会新生成的库文件名，否则整编是无法生成对应的库文件
例如：MM_CAMERA += libmmcamera_hi846
至此camera的bring up就已经完成了
另外：解析camera 在kernel中dtsi信息的文件是：msm_camera_dt_util.c
总结：
camera bring up需要修改的文件
kernel
kernel/msm-3.18/arch/arm/boot/dts/qcom/msm8953-camera-sensor-mtp.dtsi
vendor
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/configs/msm8953_camera.xml
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/configs/Android.mk
vendor/qcom/proprietory/common/config/device-vendor.mk
添加的文件：
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/configs/hi846_chromatix.xml
新添加的目录
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/chromatix/0309/chromatix_hi846/
vendor/qcom/proprietory/mm-camera/mm-camera2/media-controller/modules/sensors/sensor/libs/hi846/