Jetson orin nx 16GB + ksz9477 switch

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
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1

Hi All,

I have a custom base board and using a jetson orin nx 16GB module. The SOM ethernet is connected directly to the phy port of the ksz9477 switch and the SPI to control the switch.

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I also have other devices connected to the other phy ports and I´m not using the RGMII and SGMII ports.

I´m currently having issues with the dsa driver (dsa2.c) and I could track the problem down to the dsa_port_parse_of function.

if (ethernet) {
struct net_device *master;
master = of_find_net_device_by_node(ethernet);
of_node_put(ethernet);
if (!master){
return -EPROBE_DEFER;
}

	return dsa_port_parse_cpu(dp, master);
}

Where this function is returning EPROBE_DEFER.

I´m editing tegra234-p3768-0000-a0.dtsi and added the following to this file:

eth1: pcie@140a0000 {// C8 - Ethernet
status = “okay”;

	//nvidia,pex-wake-gpios = <&tegra_main_gpio TEGRA234_MAIN_GPIO(L, 2) GPIO_ACTIVE_LOW>;
};




spi@3210000{ /* SPI1 in 40 pin conn */
	status = "okay";
	ksz9477@0{
		compatible = "microchip,ksz9477";
		reg = <0x0>;
		reset-gpios = <&tegra_aon_gpio TEGRA234_AON_GPIO(CC, 2) GPIO_ACTIVE_HIGH>;
		spi-max-frequency = <1000000>;
		spi-cpha;
		spi-cpol;
		status = "okay";  
		controller-data {
			nvidia,enable-hw-based-cs;
			nvidia,rx-clk-tap-delay = <0x10>;
			nvidia,tx-clk-tap-delay = <0x0>;
		};
		ports{
			#address-cells = <1>;
			#size-cells = <0>;
			port@0 {
				reg = <0>;
				label = "cpu";
				ethernet = <&eth1>;
				phy-mode = "rgmii-txid";
				fixed-link {
					speed = <1000>;
					full-duplex;
					pause;
				};
			};
			port@1 {
				reg = <1>;
				label = "lan2";
			};
			port@2 {
				reg = <2>;
				label = "lan3";
			};
			port@3 {
				reg = <3>;
				label = "lan4";
			};
			port@4 {
				reg = <4>;
				label = "lan5";
			};
	        };
	
	};
};

Could you please help me check what could be going wrong?

Best Regards

Daniel

3

Hi follmer,

Are you using the devkit or custom board for Orin NX module?
What’s your Jetpack version in use?

It seems a custom driver.
From your code snipet, it seems something missing in device tree.

I would suggest you ask the vendor for the porting guide of ksz9477 switch.

4

Hi Kevin,

I´m using a custom board and jetpack 35.4.1

I also used the p3767.conf.common as reference.

Could you please check and let me know what is wrong inside the dtsi file?

Best regards,

Daniel

5
  1. I don’t see how you specify which pin is used for CS in your device tree. (cs-gpios)
  2. It seems the driver is looking for the ethernet node failed.

Please also share the porting guide for further check.

6

Hi Kevin,

Here is the porting guide:

https://microchip.my.site.com/s/article/EVB-KSZ9477--How-to-Use-the-Linux-DSA-Driver

tegra234-p3768-0000-a0.zip (2.3 KB)

I also attached the dtsi file.

Daniel

7

I don’t have your module so that I can not verify it locally.

May I know why you comment out the following lines?

	/*eth1: ethernet@2310000 {
		status = "okay";
		fixed-link {
			speed = <1000>;
			full-duplex;
		};
	};*/

Could you try to add it back and check if you still hit EPROBE_DEFER issue during finding ethernet node?

8

I also tried with ethernet@2310000 and the same problem occurs.

9

Does the dmesg show the same error?

10

yes, the same error.

11

As I stated before, I don’t have this module to help you verifying it locally.
You may ask the vendor for this error reporting from driver.

Or you can refer to kernel/kernel-5.10/Documentation/devicetree/bindings/net/dsa/ksz.txt to configure the device tree.

13

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