TDA4VM: Debugging Ethernet PHY on Linux is TJA1101

Cherry Zhou

Mastermind 22235 points

Part Number: TDA4VM

Hi team,

Here's an issue from the customer may need your help:

A. TJA1101 is connected to RGMII5 as shown in the figure below:

B. Kernel has PHY driver selected:

1) Is there any Ethernet PHY debugging documentation available for reference on Linux?

2) The TJA1101 has CONFIG3/CONFIG2 configured to high, that is, PHYAD = 00110, how to modify the corresponding address in the drive code?

3) How to configure pin multiplexing?

Could you help check this case? Thanks.

Best Regards,

Cherry

over 3 years ago

0 Tanmay Patil over 3 years ago

TI__Mastermind 43830 points

Hi Cherry,

Cherry Zhou said:
The TJA1101 has CONFIG3/CONFIG2 configured to high, that is, PHYAD = 00110, how to modify the corresponding address in the drive code?

In the phy node, you should mention the PHYAD in the reg property. See [PSDK Linux Install dir]/board-support/linux-[commit-hash]/Documentation/devicetree/bindings/net/ethernet-phy.yaml for more details.

Cherry Zhou said:
How to configure pin multiplexing?

It seems that you are using RMII7 with the phy. Check the pinmux guide section here to set the configure the pinmuxing.

What is exactly the issue here?

Regards,
Tanmay

0 Cherry Zhou over 3 years ago in reply to Tanmay Patil

TI__Mastermind 22235 points

Hi Tanmay,

Thanks for your support.

1. The following doc have been referenced by the customer when configuring on Linux, using the RMII interface. But there is no device tree in the list for RMII, can it be supported? If so, how to modify it?

https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-jacinto7/08_06_00_11/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/Network/CPSWng-Native-Ethernet.html#cpswng-native-ethernet

Tanmay Patil said:
What is exactly the issue here?

There was an error in the pinmux configuration:

Thanks and Regards,

Cherry

0 cesar.xu over 3 years ago in reply to Cherry Zhou

Intellectual 490 points

Hi Tanmay,

Do you have time to reply,

Regards,

cesar

0 Tanmay Patil over 3 years ago in reply to cesar.xu

TI__Mastermind 43830 points

Hi Cherry, Cesar,

Cherry Zhou said:
The following doc have been referenced by the customer when configuring on Linux, using the RMII interface. But there is no device tree in the list for RMII, can it be supported? If so, how to modify it?

The RMII mode is supported. It can be used as follows from the ethernet port node -

&cpsw0_port1 {
	phy-handle = <&cpsw9g_phy12>;
	phy-mode = "rmii";
	mac-address = [00 00 00 00 00 00];
	phys = <&cpsw0_phy_gmii_sel 1>;
};

Cherry Zhou said:
There was an error in the pinmux configuration:

This looks like a pin conflict. The pin used for RMII_REF_CLK is being used by some other peripheral. Its ball number AD18 according to datasheet. Can you check.

Is this thread same as "">e2e.ti.com/.../tda4vm-cpswng-native-ethernet-on-linux" this thread?

I am closing this thread as it seems duplicate and we will continue discussion on the other thread.

Let me know if that's not the case.

Regards,
Tanmay

0 cesar.xu over 3 years ago in reply to Tanmay Patil

Intellectual 490 points

Hi Tanmay,

"Is this thread same as "">e2e.ti.com/.../tda4vm-cpswng-native-ethernet-on-linux" this thread?"

yes, close it.

Regards,

Cesar

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TDA4VM: Debugging Ethernet PHY on Linux is TJA1101