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【Camera专题】Camera dtsi 完全解析

2022-07-03 01:21:00 【c枫_撸码的日子】

一、唠嗑

说来惭愧，搬砖也有一段时间了，dtsi里面有些配置还没弄清楚含义，
作为一个咸鱼的搬砖行家，就研究一下吧！

二、知识点

平台：8909

主要参考kernel/Documentation/devicetree/bindings/media/video/msm-cci.txt的注释，加上自我的理解！

1. sensor配置

qcom,[email protected]0 {
    
        cell-index = <0>;
        compatible = "qcom,camera";
        reg = <0x2>;
        qcom,csiphy-sd-index = <0>;
        qcom,csid-sd-index = <0>;
        qcom,mount-angle = <90>;
        qcom,eeprom-src = <&eeprom0>;
        qcom,actuator-src = <&actuator0>;
        qcom,led-flash-src = <&led_flash0>;
        cam_vana-supply = <&pm8916_l2>;
        cam_vdig-supply = <&pm8916_s3>;
        cam_vio-supply = <&pm8916_l10>;
        cam_vaf-supply = <&pm8916_l11>;
        qcom,cam-vreg-name = "cam_vana","cam_vdig","cam_vio", "cam_vaf";
        qcom,cam-vreg-type = <0 0 0 0>;
        qcom,cam-vreg-min-voltage = <2800000 1500000 1800000  2800000>;
        qcom,cam-vreg-max-voltage = <2800000 1500000 1800000  2800000>;
        qcom,cam-vreg-op-mode = <200000 100000 80000  100000>;
        pinctrl-names = "cam_default", "cam_suspend";
        pinctrl-0 = <&cam_sensor_mclk0_default &cam_sensor_rear_default>;
        pinctrl-1 = <&cam_sensor_mclk0_sleep &cam_sensor_rear_sleep>;
        gpios = <&msm_gpio 26 0>,
            <&msm_gpio 29 0>,
            <&msm_gpio 33 0>;
        qcom,gpio-reset = <1>;
        qcom,gpio-standby = <2>;
        qcom,gpio-req-tbl-num = <0 1 2>;
        qcom,gpio-req-tbl-flags = <1 0 0>;
        qcom,gpio-req-tbl-label = "CAMIF_MCLK",
            "CAM_RESET0",
            "CAM_STANDBY";
        qcom,sensor-position = <0>;
        qcom,sensor-mode = <0>;
        qcom,cci-master = <0>;
        status = "ok";
        clocks = <&clock_gcc clk_mclk0_clk_src>,
            <&clock_gcc clk_gcc_camss_mclk0_clk>;
        clock-names = "cam_src_clk", "cam_clk";
    };

1. cell-index = <0>;
唯一标识，用来区分多个摄像头。

源码：
kernel/drivers/media/platform/msm/camera_v2/sensor/msm_sensor_driver.c

static int32_t msm_sensor_driver_get_dt_data(struct msm_sensor_ctrl_t *s_ctrl){
    
···
    /* * Read cell index - this cell index will be the camera slot where * this camera will be mounted */
    rc = of_property_read_u32(of_node, "cell-index", &cell_id);
    if (rc < 0) {
    
        pr_err("failed: cell-index rc %d", rc);
        goto FREE_SENSOR_DATA;
    }
    s_ctrl->id = cell_id;
···
}

按照这里的英文注释，cell index标识camera安装的位置，这个值只要唯一即可！

2. compatible = “qcom,camera”;
匹配节点，驱动和设备的compatible属性相同时，才会调用probe函数。
dtsi里面配置就是设备，下面的源码对应的就是驱动，这两个属性相同。

源码：
kernel/drivers/media/platform/msm/camera_v2/sensor/msm_sensor_driver.c

static const struct of_device_id msm_sensor_driver_dt_match[] = {
    
    {
    .compatible = "qcom,camera"},
    {
    }
};

MODULE_DEVICE_TABLE(of, msm_sensor_driver_dt_match);

static struct platform_driver msm_sensor_platform_driver = {
    
    .probe = msm_sensor_driver_platform_probe,
    .driver = {
    
        .name = "qcom,camera",
        .owner = THIS_MODULE,
        .of_match_table = msm_sensor_driver_dt_match,
    },
    .remove = msm_sensor_platform_remove,
};

3. reg = <0x2>;
i2c地址，从经验来看，只要配置成唯一即可，不过还是推荐配成i2c地址！

未找到源码调用的位置

4. qcom,csiphy-sd-index = <0>;
用于接收传感器数据的csiphy实例,
可以配置的值：0,1,2

源码：
kernel/drivers/media/platform/msm/camera_v2/sensor/io/msm_camera_dt_util.c

5. qcom,csid-sd-index = <0>;
用于接收传感器数据的csid核心实例
可以配置的值：0,1,2

源码：
kernel/drivers/media/platform/msm/camera_v2/sensor/io/msm_camera_dt_util.c

6. qcom,mount-angle = <90>;
摄像头在设备上的物理安装角度
可以配置的值：0,90,180,360

一般来说 sensor raw图默认的方向都是90或者270！

7. qcom,eeprom-src = <&eeprom0>;
如果支持otp(eeprom)的话，就配置成各种的eeprom节点，否则不配置。

8. qcom,actuator-src = <&actuator0>;
如果支持马达的话，就配置成各自的马达节点，否则不配置。

9. qcom,led-flash-src = <&led_flash0>;
如果支持闪光灯的话，就配置成各自的闪光灯节点，否则不配置。

10. cam_vana-supply = <&pm8916_l2>;
avdd供电，是否是要配置，配置成哪路系统供电，需要和硬件沟通！
11. cam_vdig-supply = <&pm8916_s3>;
dvdd供电，是否是要配置，配置成哪路系统供电，需要和硬件沟通！
12. cam_vio-supply = <&pm8916_l10>;
iovdd供电，是否是要配置，配置成哪路系统供电，需要和硬件沟通！
13. cam_vaf-supply = <&pm8916_l11>;
马达供电，是否是要配置，配置成哪路系统供电，需要和硬件沟通！
14. qcom,cam-vreg-name等

  • qcom,cam-vreg-name = “cam_vana”,“cam_vdig”,“cam_vio”, “cam_vaf”;
    配置sensor需要的所有电源。
    可配置选项：“cam_vdig”, “cam_vana”, “cam_vio”, “cam_vaf”
    分别代表含义：dvdd,avdd，iovdd，af供电
    不一定要全部配置，用到哪路配哪路，有些电路硬件自己拉高了，具体跟硬件沟通。

  • qcom,cam-vreg-type = <0 0 0 0>;
    指定用于此sensor的电源类型，1表示不使用，0表示使用。
    默认配0.
    其他配置参考

171        qcom,cam-vreg-type = <0 1>;
172        qcom,cam-vreg-min-voltage = <1200000 0>;
173        qcom,cam-vreg-max-voltage = <1200000 0>;

  • qcom,cam-vreg-min-voltage = <2800000 1500000 1800000 2800000>;
    供电电源的最大值，单位mV
    第一个dvdd最大值为2800000mA=2.8V，其他同理

  • qcom,cam-vreg-max-voltage = <2800000 1500000 1800000 2800000>;
    供电电源的最小值，单位mV
    第一个dvdd最小值为2800000mA=2.8V，其他同理

  • qcom,cam-vreg-op-mode = <200000100000 80000 100000>;
    供电电源的最佳电压水平。
    比如第一个dvdd最佳电压水平为200000
    常用值：200000 100000 105000 80000 0
    这个节点没有完全理解。

注意：

 qcom,cam-vreg-name = "cam_vana","cam_vdig","cam_vio", "cam_vaf";
qcom,cam-vreg-type = <0 0 0 0>;
qcom,cam-vreg-min-voltage = <2800000 1500000 1800000  2800000>;
qcom,cam-vreg-max-voltage = <2800000 1500000 1800000  2800000>;
qcom,cam-vreg-op-mode = <200000 100000 80000  100000>;

这些值分别是按顺序一一对应的！

15. pinctrl-names pinctrl-0 pinctrl-1

        pinctrl-names = "cam_default", "cam_suspend";
        pinctrl-0 = <&cam_sensor_mclk0_default &cam_sensor_rear_default>;
        pinctrl-1 = <&cam_sensor_mclk0_sleep &cam_sensor_rear_sleep>;

这个也是按照顺序一一对应的。

  • pinctrl-names = “cam_default”, “cam_suspend”;
    默认就这么配置，前面代表clk，后面代表reset脚和standby脚，唤醒作用。


kernel/drivers/media/platform/msm/camera_v2/sensor/io/msm_camera_dt_util.c

static int msm_camera_pinctrl_init(struct msm_camera_power_ctrl_t *ctrl)
{
    
    struct msm_pinctrl_info *sensor_pctrl = NULL;

    sensor_pctrl = &ctrl->pinctrl_info;
    sensor_pctrl->pinctrl = devm_pinctrl_get(ctrl->dev);
···
    sensor_pctrl->gpio_state_active =
        pinctrl_lookup_state(sensor_pctrl->pinctrl,
                CAM_SENSOR_PINCTRL_STATE_DEFAULT);
···
    sensor_pctrl->gpio_state_suspend
        = pinctrl_lookup_state(sensor_pctrl->pinctrl,
                CAM_SENSOR_PINCTRL_STATE_SLEEP);
··· 
    return 0;
}
  • pinctrl-0 = <&cam_sensor_mclk0_default &cam_sensor_rear_default>;

kernel/arch/arm/boot/dts/qcom/msm8909-pinctrl-i18.dtsi

        /*sensors */
        cam_sensor_mclk0_default: cam_sensor_mclk0_default {
    
            /* MCLK0 */
            mux {
    
                /* CLK, DATA */
                pins = "gpio26";
                function = "cam_mclk";
            };

            config {
    
                pins = "gpio26";
                bias-disable; /* No PULL */
                drive-strength = <2>; /* 2 MA */
            };
        };

        cam_sensor_rear_default: cam_sensor_rear_default {
    
            /* RESET, STANDBY */
            mux {
    
                pins = "gpio29", "gpio33";
                function = "gpio";
            };

            config {
    
                pins = "gpio29","gpio33";
                bias-disable; /* No PULL */
                drive-strength = <2>; /* 2 MA */
            };
        };

这里的gpio配置成多少，和硬件沟通

pinctrl-1 = <&cam_sensor_mclk0_sleep &cam_sensor_rear_sleep>;

        cam_sensor_mclk0_sleep: cam_sensor_mclk0_sleep {
    
            /* MCLK0 */
            mux {
    
                /* CLK, DATA */
                pins = "gpio26";
                function = "cam_mclk";
            };

            config {
    
                pins = "gpio26";
                bias-pull-down; /* PULL DOWN */
                drive-strength = <2>; /* 2 MA */
            };
        };

        cam_sensor_rear_sleep: cam_sensor_rear_sleep {
    
            /* RESET, STANDBY */
            mux {
    
                pins = "gpio29","gpio33";
                function = "gpio";
            };

            config {
    
                pins = "gpio29","gpio33";
                bias-disable; /* No PULL */
                drive-strength = <2>; /* 2 MA */
            };
        };

这里的gpio配置成多少，和硬件沟通

16. gpio相关

gpios = <&msm_gpio 26 0>,
        <&msm_gpio 29 0>,
        <&msm_gpio 33 0>;
qcom,gpio-reset = <1>;
qcom,gpio-standby = <2>;
qcom,gpio-req-tbl-num = <0 1 2>;
qcom,gpio-req-tbl-flags = <1 0 0>;
qcom,gpio-req-tbl-label = "CAMIF_MCLK","CAM_RESET0","CAM_STANDBY";

这里分别是一一对应的
比如：
26 对应 CAMIF_MCLK
29 对应 CAM_RESET0
33 对应 CAM_STANDBY

  • qcom,gpio-reset = <1>;
    传感器 reset脚的索引，这里是1

  • qcom,gpio-standby = <2>
    传感器 standby脚的索引，这里是2

  • qcom,gpio-req-tbl-num = <0 1 2>;
    mclk，reset，stanby的索引，由于mclk为0，qcom,gpio-reset = <1>，qcom,gpio-standby = <2>
    因此配置成 <0,1,2>

  • qcom,gpio-req-tbl-flags = <1 0 0>;
    gpio的方向，mclk为1，表示输出，reset和standby为0，表示输入。

  • qcom,gpio-req-tbl-label
    gpio的名称。
    常用值：
    “CAMIF_MCLK”, “CAM_RESET”,“CAM_STANDBY”;
    “CAMIF_MCLK0”, “CAM_RESET0”,“CAM_STANDBY0”;
    “CAMIF_MCLK1”, “CAM_RESET1”,“CAM_STANDBY1”;
    “CAMIF_MCLK2”, “CAM_RESET2”,“CAM_STANDBY2”;

17. qcom,sensor-position = <0>;
camera位置。

  • 0-后摄
  • 1-前摄
  • 0x100-副摄(目前只有后摄有副摄，前摄暂时没有)

18. qcom,sensor-mode = <0>;
传感器模式支持

  • 0 -> back camera 2D
  • 1 -> front camera 2D
  • 2 -> back camera 3D
  • 3 -> back camera int 3D

19. qcom,cci-master = <0>;
sensor使用的master id。
可选值：

  • 0 -> MASTER 0
  • 1 -> MASTER 1

20. clocks相关

clocks = <&clock_gcc clk_mclk0_clk_src>,
         <&clock_gcc clk_gcc_camss_mclk0_clk>;
clock-names = "cam_src_clk", "cam_clk";
  • clocks
    设备使用的时钟
30	clock_gcc: qcom,[email protected]1800000 {
    
31		compatible = "qcom,dummycc";
32		#clock-cells = <1>;
33	};

#define clk_mclk0_clk_src 0x266b3853
#define clk_mclk1_clk_src 0xa73cad0c
#define clk_mclk2_clk_src 0x42545468
#define clk_mclk3_clk_src 0x2bfbb714
  • clock-names
    设备所需时钟的名称
99static struct msm_cam_clk_info cam_8974_clk_info[] = {
    
100	[SENSOR_CAM_MCLK] = {
    "cam_src_clk", 24000000},
101	[SENSOR_CAM_CLK] = {
    "cam_clk", 0},
102};

Stay Hungry,Stay Foolish !

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版权声明
本文为[c枫_撸码的日子]所创，转载请带上原文链接，感谢
https://blog.csdn.net/justXiaoSha/article/details/100593075

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