RE: [RFC PATCH 1/8] dt-bindings: net: Add TSN Endpoint Ethernet MAC support

[Neeli, Srinivas]

[Public]

Hi,

> -----Original Message-----
> From: Andrew Lunn <andrew@xxxxxxx>
> Sent: Friday, February 20, 2026 7:09 PM
> To: Neeli, Srinivas <srinivas.neeli@xxxxxxx>
> Cc: andrew+netdev@xxxxxxx; davem@xxxxxxxxxxxxx;
> edumazet@xxxxxxxxxx; kuba@xxxxxxxxxx; pabeni@xxxxxxxxxx; Simek,
> Michal <michal.simek@xxxxxxx>; robh@xxxxxxxxxx; krzk+dt@xxxxxxxxxx;
> conor+dt@xxxxxxxxxx; richardcochran@xxxxxxxxx; netdev@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; git (AMD-Xilinx) <git@xxxxxxx>
> Subject: Re: [RFC PATCH 1/8] dt-bindings: net: Add TSN Endpoint Ethernet
> MAC support
>
> > > > +        // Endpoint Node
> > > > +        ep_mac: ep-mac@16000 {
> > > > +            reg = <0x16000 0xa000>;
> > > > +        };
> > >
> > > Except the Endpoint MAC does not have MDIO?  Or does it have an MDIO
> > > bus, and you have simply not listed it?
> > The endpoint MAC does not connect to an external PHY and therefore does
> not expose an MDIO bus.
> > It is an internal endpoint, so no MDIO node is required.
>
> It does not really matter if it is required. Does it physically exist?
> Can MDC and MDIO be routed to pins? Could i hang an external switch off it?
>
> DT describes hardware. If the hardware exists, describe it.
>
>       Andrew

The endpoint does not have an MDIO controller in hardware, and such functionality does not physically exist.
As a result, attaching any external PHY or switch is not possible.
The Endpoint connected to the CPU through the AXI bus.

Thanks
Neeli Srinivas