[参考译文] SK-TDA4VM：DS90UB960无法连接到 imx390

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1501885/sk-tda4vm-ds90ub960-cannot-connect-to-imx390

工具/软件：

您好导出、

   我们使用的设备树叠加层：

       k3-j722s-evm-fpdlink-fusion.dtbo

       k3-fpdlink-imx390-rcm-0-0.dtbo

   已通过 uEnv.txt 正确包含这些重叠内容。

硬件连接拓扑

IMX390 (LI-IMX390-FPDLINKIII-120H、不带 ISP)
  ⇅μ s
DS90UB953
  ⇅μ s
DS90UB960
  ⇅μ s
SK-TDA4VM

当前状态

   启动后、使用 media-ctl 检查该拓扑、显示了是否正确检测到与 DS90UB953串行器的连接。

   但是、IMX390传感器无法初始化、并且没有可用的摄像头流。

   imx390内核模块已正确加载。

   根据 dmesg、IMX390在探测期间出现故障、并出现 I2C 读取错误(错误-121)。

相关的 dmesg 日志

[  12.656592] imx390 10-0021：插入频率：27027027 Hz
[12.707615]  imx390 10-0021：imx390_read：无法读取寄存器0x0330：-121
[  12.714641] imx390：10-0021的探测器失败、错误为-121

加载的内核模块(lsmod)

imx390               102400 0
ds90ub953             16384 1.
ds90ub960             36864 1.

媒体拓扑

如附图所示、以下链接已建立并可见：

j721e-csi2rx→cdns_csi2rx→ds90ub960→ds90ub953

但是、IMX390摄像头不会出现在媒体图中、并且无法访问。

这是我的 dtso：

k3-j721e-sk-fpdlink-fusion.dtso
// SPDX-License-Identifier: GPL-2.0
/*
 * DT Overlay for Fusion (FPD-Link III) board on J721E SK,
 * AM68 SK or AM69 SK.
 * svtronics.com/.../
 *
 * Copyright (C) 2023 Texas Instruments Incorporated - http://www.ti.com/
 */

/dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>

&{/} {
	clk_fusion_25M_fixed: fixed-clock-25M {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <25000000>;
	};
};


&cam0_i2c {
	#address-cells = <1>;
	#size-cells = <0>;

	deser@3d {
		compatible = "ti,ds90ub960-q1";
		reg = <0x3d>;
		clocks = <&clk_fusion_25M_fixed>;
		clock-names = "refclk";
		i2c-alias-pool = <0x4a 0x4b 0x4c 0x4d 0x4e 0x4f>;

		ds90ub960_0_ports: ports {
			#address-cells = <1>;
			#size-cells = <0>;

			/* CSI-2 TX*/
			port@4 {
				reg = <4>;
				ds90ub960_0_csi_out: endpoint {
					clock-lanes = <0>;
					data-lanes = <1 2 3 4>;
					link-frequencies = /bits/ 64 <1200000000>;
					remote-endpoint = <&csi2_phy0>;
				};
			};
		};

		ds90ub960_0_links: links {
			#address-cells = <1>;
			#size-cells = <0>;
		};
	};
};

&cdns_csi2rx0 {
	ports {
		#address-cells = <1>;
		#size-cells = <0>;

		csi0_port0: port@0 {
			reg = <0>;
			status = "okay";

			csi2_phy0: endpoint {
				remote-endpoint = <&ds90ub960_0_csi_out>;
				clock-lanes = <0>;
				data-lanes = <1 2 3 4>;
				link-frequencies = /bits/ 64 <1200000000>;

			};
		};
	};
};

&ti_csi2rx0 {
	status = "okay";
};

&dphy0 {
	status = "okay";
};

k3-fpdlink-imx390-rcm-0-0.dtso
// SPDX-License-Identifier: GPL-2.0
/*
 * IMX390 FPD-Link 3 Camera Module
 * Copyright (c) 2023 Texas Instruments Incorporated - http://www.ti.com/
 */

/dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>

&ds90ub960_0_ports {
	#address-cells = <1>;
	#size-cells = <0>;

	/* FPDLink RX 0 */
	port@0 {
		reg = <0>;

		ub960_fpd3_1_in: endpoint {
			remote-endpoint = <&ub953_1_out>;
		};
	};
};

&ds90ub960_0_links {
	#address-cells = <1>;
	#size-cells = <0>;

	link@0 {
		reg = <0>;
		i2c-alias = <0x18>;

		ti,rx-mode = <3>;

		serializer: serializer {
			compatible = "ti,ds90ub953-q1";
			gpio-controller;
			#gpio-cells = <2>;

			#clock-cells = <0>;

			ports {
				#address-cells = <1>;
				#size-cells = <0>;

				port@0 {
					reg = <0>;
					ub953_1_in: endpoint {
						data-lanes = <1 2 3 4>;
						remote-endpoint = <&sensor_1_out>;
					};
				};

				port@1 {
					reg = <1>;

					ub953_1_out: endpoint {
						remote-endpoint = <&ub960_fpd3_1_in>;
					};
				};
			};

			i2c {
				#address-cells = <1>;
				#size-cells = <0>;

				sensor@21 {
					compatible = "sony,imx390";
					reg = <0x21>;

					clocks = <&serializer>;
					clock-names = "inck";
					assigned-clocks = <&serializer>;
					assigned-clock-rates = <27000000>;

					xclr-gpios = <&serializer 1 GPIO_ACTIVE_LOW>;
					error0-gpios = <&serializer 2 GPIO_ACTIVE_HIGH>;
					error1-gpios = <&serializer 3 GPIO_ACTIVE_HIGH>;
					comready-gpios = <&serializer 0 GPIO_ACTIVE_HIGH>;

					port {
						sensor_1_out: endpoint {
							remote-endpoint = <&ub953_1_in>;
						};
					};
				};
			};
		};
	};
};

我们还确认 I2C 的占用地址为 ds90ub960的地址、0x18为远程注册的 ds90ub953的地址。