DP83TC814R-Q1: Ethernet PHY not detected - MDIO device at address 0 is missing

Muthukumar SEKAR

Part Number: DP83TC814S-Q1

Hi Expert!

We are using DP83TC814S-Q1 in our custom HW.

Current we are facing - PHY is not found on the MDIO bus issue.

qcom,emac: MDIO device at address 0 is missing

We have checked the DP83TC812 Troubleshooting Guide

We have followed, this dts(Example2) - https://android.googlesource.com/kernel/msm/+/android-7.1.0_r0.2/Documentation/devicetree/bindings/net/msm-emac.txt

dts entries updated as per the schematics.

As per our analysis, issue in dts, Does any other change required in dts for PHY is not found on the MDIO bus issue-fix.

Kindly check and update.

Thanks,

Muthukumar. S

2 months ago

0 David Creger 2 months ago

TI__Mastermind 18886 points

Hi Muthukumar,

Let me check on this and get back on Monday.

Thanks,

David

0 Muthukumar SEKAR 2 months ago in reply to David Creger

Prodigy 40 points

Hello David,

Thanks for the response.

We are waiting for your update.

Thanks

Muthukumar. S

0 David Creger 2 months ago in reply to Muthukumar SEKAR

TI__Mastermind 18886 points

Hi Muthukumar,

Can you read registers in the linux terminal using any tool such as PHYtool?

What is the PHY address? Please share the schematic so I can check the PHY address straps.

Is the PHY functional? Are you able to link up with a link partner?

Thanks,

David

0 Muthukumar SEKAR 2 months ago in reply to David Creger

Prodigy 40 points

Hello David,

Currently we haven't the PHYtool in our rootfs, We will check.

Please find our schematics, Kindly check and update.

Thanks

Muthukumar. S

0 David Creger 2 months ago in reply to Muthukumar SEKAR

TI__Mastermind 18886 points

Hi Muthukumar,

Please share the full pdf schematic, so that I can see the PHY Address straps (Pin 14 and pin 15).

Thanks,

David

0 Muthukumar SEKAR 2 months ago in reply to David Creger

Prodigy 40 points

Hello David Creger,

It is confidential, we can not share full schematic.pdf, I have found the PHY Address straps (Pin 14 and pin 15) details and added, it is open, hope it will helpful.

Kindly check and update.

Thanks

Muthukumar. S

0 David Creger 2 months ago in reply to Muthukumar SEKAR

TI__Mastermind 18886 points

Hi Muthukumar,

I see you have selected address 0xC via strap. The error code you shared is expecting to see a PHY at address 0x0. Please change the PHY address in the device tree. Let me know if this fixes the issue.

Thanks,

David

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DP83TC814R-Q1: Ethernet PHY not detected - MDIO device at address 0 is missing