rk3568 适配摄像头 (mipi 单摄)

MIPI CSI（Mobile Industry Processor Interface Camera Serial Interface）是一种用于移动设备的高速串行接口标准，用于连接图像传感器和图像处理器。MIPI CSI接口使用差分信号传输技术，将数据分为数据线和时钟线两部分，以提高传输速度和抗干扰能力。数据线和时钟线通过MIPI D-PHY（Physical Layer）进行物理层传输，D-PHY支持多种传输速率和数据格式。

提示：rk3568 支持 4lane 的mipi CSI，且可拆分成 2+2模式。

文章目录

rk3568 适配摄像头 (mipi 单摄)
圈重点看想学
1. 核查硬件，匹配摄像头
- 1.1 内核设备树适配gc8034
- 1.2 内核设备树适配 ov5695
- 1.3 gc8034 和ov5695自动匹配
2 调试过程问题分析
总结

圈重点看想学

a) 适配mipi摄像头 gc8034
b) 适配mipi摄像头 ov5695

1. 核查硬件，匹配摄像头

核查原理图需要匹配摄像头的供电 avdd、vdd、vcc，控制信号 pwdn、reset、enable，主时钟(rk3568输出时钟)，I2C总线和 mipi信号通道。此处不在赘述，需要了解的小伙伴请关注博主的下一篇博文。
rk3568 CSI
核查rk3568芯片手册发现仅有一个CSI 4 lane，可以拆分成 2 lane x 2分。匹配摄像头方式如下：
CSI-modes

1.1 内核设备树适配gc8034

&i2c2 {status = "okay";pinctrl-0 = <&i2c2m1_xfer>;/* full mode: lane0-3 */gc8034: gc8034@37 {compatible = "galaxycore,gc8034";status = "okay";reg = <0x37>;clocks = <&cru CLK_CIF_OUT>;clock-names = "xvclk";power-domains = <&power RK3568_PD_VI>;pinctrl-names = "default";pinctrl-0 = <&cif_clk>;reset-gpios = <&gpio3 RK_PA6 GPIO_ACTIVE_LOW>;pwdn-gpios = <&gpio4 RK_PB2 GPIO_ACTIVE_LOW>;rockchip,camera-module-index = <0>;rockchip,camera-module-facing = "back";rockchip,camera-module-name = "RK-CMK-8M-2-v1";rockchip,camera-module-lens-name = "CK8401";port {gc8034_out: endpoint {remote-endpoint = <&dphy0_in>;data-lanes = <1 2 3 4>;};};};
};&csi2_dphy_hw {status = "okay";
};&csi2_dphy0 {status = "okay";/** dphy0 only used for full mode,* full mode and split mode are mutually exclusive*/ports {#address-cells = <1>;#size-cells = <0>;port@0 {reg = <0>;#address-cells = <1>;#size-cells = <0>;dphy0_in: endpoint@1 {reg = <1>;remote-endpoint = <&gc8034_out>;data-lanes = <1 2 3 4>;};};port@1 {reg = <1>;#address-cells = <1>;#size-cells = <0>;dphy0_out: endpoint@1 {reg = <1>;remote-endpoint = <&isp0_in_dphy0>;};};};
};&rkisp {status = "okay";
};&rkisp_mmu {status = "okay";
};&rkisp_vir0 {status = "okay";port {#address-cells = <1>;#size-cells = <0>;isp0_in: endpoint@0 {reg = <0>;remote-endpoint = <&dphy1_out>;};isp0_in_dphy0: endpoint@1 {reg = <1>;remote-endpoint = <&dphy0_out>;};};
};

1.2 内核设备树适配 ov5695

&i2c2 {status = "okay";pinctrl-0 = <&i2c2m1_xfer>;ov5695: ov5695@36 {status = "okay";compatible = "ovti,ov5695";reg = <0x36>;clocks = <&cru CLK_CAM0_OUT>;clock-names = "xvclk";power-domains = <&power RK3568_PD_VI>;pinctrl-names = "default";pinctrl-0 = <&cam_clkout0>;reset-gpios = <&gpio3 RK_PD0 GPIO_ACTIVE_HIGH>;pwdn-gpios = <&gpio3 RK_PC6 GPIO_ACTIVE_HIGH>;/*power-gpios = <&gpio0 RK_PC1 GPIO_ACTIVE_HIGH>;*/rockchip,camera-module-index = <0>;rockchip,camera-module-facing = "back";rockchip,camera-module-name = "TongJu";rockchip,camera-module-lens-name = "CHT842-MD";port {ov5695_out: endpoint {remote-endpoint = <&mipi_in_ucam0>;data-lanes = <1 2>;};};};
};&csi2_dphy0 {status = "okay";ports {#address-cells = <1>;#size-cells = <0>;port@0 {reg = <0>;#address-cells = <1>;#size-cells = <0>;mipi_in_ucam0: endpoint@1 {reg = <1>;remote-endpoint = <&ov5695_out>;data-lanes = <1 2>;};};port@1 {reg = <1>;#address-cells = <1>;#size-cells = <0>;csidphy_out: endpoint@0 {reg = <0>;remote-endpoint = <&isp0_in>;};};};
};&rkisp {status = "okay";
};&rkisp_mmu {status = "okay";
};&rkisp_vir0 {status = "okay";port {#address-cells = <1>;#size-cells = <0>;isp0_in: endpoint@0 {reg = <0>;remote-endpoint = <&csidphy_out>;};};
};

1.3 gc8034 和ov5695自动匹配

	gc8034: gc8034@37 {compatible = "galaxycore,gc8034";reg = <0x37>;clocks = <&cru CLK_CAM0_OUT>;clock-names = "xvclk";power-domains = <&power RK3568_PD_VI>;pinctrl-names = "default";pinctrl-0 = <&cam_clkout0>;reset-gpios = <&gpio2 RK_PD5 GPIO_ACTIVE_LOW>;pwdn-gpios = <&gpio4 RK_PA6 GPIO_ACTIVE_LOW>;rockchip,grf = <&grf>;rockchip,camera-module-index = <0>;rockchip,camera-module-facing = "back";rockchip,camera-module-name = "RK-CMK-8M-2-v1";rockchip,camera-module-lens-name = "CK8401";port {gc8034_out: endpoint {remote-endpoint = <&mipi_in_ucam0>;data-lanes = <1 2 3 4>;};};};ov5695: ov5695@36 {status = "okay";compatible = "ovti,ov5695";reg = <0x36>;clocks = <&cru CLK_CAM0_OUT>;clock-names = "xvclk";power-domains = <&power RK3568_PD_VI>;pinctrl-names = "default";pinctrl-0 = <&cam_clkout0>;reset-gpios = <&gpio2 RK_PD5 GPIO_ACTIVE_LOW>;pwdn-gpios = <&gpio4 RK_PA6 GPIO_ACTIVE_HIGH>;rockchip,camera-module-index = <0>;rockchip,camera-module-facing = "back";rockchip,camera-module-name = "TongJu";rockchip,camera-module-lens-name = "CHT842-MD";port {ov5695_out: endpoint {remote-endpoint = <&mipi_in_ucam1>;data-lanes = <1 2>;};};};
};&csi2_dphy_hw {status = "okay";
};&csi2_dphy0 {status = "okay";ports {#address-cells = <1>;#size-cells = <0>;port@0 {reg = <0>;#address-cells = <1>;#size-cells = <0>;mipi_in_ucam1: endpoint@1 {reg = <1>;remote-endpoint = <&gc8034_out>;data-lanes = <1 2 3 4>;};mipi_in_ucam2: endpoint@2 {reg = <2>;remote-endpoint = <&ov5695_out>;data-lanes = <1 2>;};};port@1 {reg = <1>;#address-cells = <1>;#size-cells = <0>;csidphy_out: endpoint@0 {reg = <0>;remote-endpoint = <&isp0_in>;};};};
};&rkisp {status = "okay";
};&rkisp_mmu {status = "okay";
};&rkisp_vir0 {status = "okay";port {#address-cells = <1>;#size-cells = <0>;isp0_in: endpoint@0 {reg = <0>;remote-endpoint = <&csidphy_out>;};};
};