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Original question:

DP83869HM: DP83869HM linux driver for 4.14 version causing oops

DP83869HM: connecting different PHYs at single MDC/MDIO lines of the processor code / dts reference

mahesh gohil
Prodigy 190 points
Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869, DP83TC811

Hello Ti team,

We have connected DP83869 and another PHY at single MDC-MDIO lines of the processor.

Can you pls suggest if there is any reference or guide available to attach different PHYs at single MDC/MDIO lines of processor ? Any DTS file reference / anything will be helpful.

-

Mahesh

  • 0
    TI__Expert 7040 points

    Hi Mahesh,

    We don't have any reference documentation specifically for connecting multiple PHYs to a single MDC/MDIO line. Multiple PHYs can be connected to the same MDC/MDIO lines from the processor, you can take a look at the DP83TC811 EVM which has two PHYs connected over one MDC-MDIO line for USB2MDIO communication. I recommend a pull-up resistor on the MDIO line close to each PHY. 

    www.ti.com/.../snlu231.pdf

    Regards,
    Justin 

  • 0 in reply to Justin Lazaruk
    Prodigy 190 points

    Thank You Justin for the reply.

    Can you pls share the code reference to handle two phys at single MDIO bus ? Could you please suggest what is the change / where do we need to change in BSP ?

    We appreciate any help here.

  • 0 in reply to mahesh gohil
    TI__Expert 7040 points

    Hi Mahesh,

    I am not sure what you are asking for. The only hardware changes needed are to ensure that the PHY_ID of each PHY is unique so that register writes can be addressed to each PHY.

    Regards,
    Justin