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

[Neeli, Srinivas]

[Public]

Hi,

> -----Original Message-----
> From: Andrew Lunn <andrew at lunn.ch>
> Sent: Friday, February 20, 2026 7:09 PM
> To: Neeli, Srinivas <srinivas.neeli at amd.com>
> Cc: andrew+netdev at lunn.ch; davem at davemloft.net;
> edumazet at google.com; kuba at kernel.org; pabeni at redhat.com; Simek,
> Michal <michal.simek at amd.com>; robh at kernel.org; krzk+dt at kernel.org;
> conor+dt at kernel.org; richardcochran at gmail.com; netdev at vger.kernel.org;
> linux-kernel at vger.kernel.org; devicetree at vger.kernel.org; linux-arm-
> kernel at lists.infradead.org; git (AMD-Xilinx) <git at amd.com>
> Subject: Re: [RFC PATCH 1/8] dt-bindings: net: Add TSN Endpoint Ethernet
> MAC support
>
> > > > +        // Endpoint Node
> > > > +        ep_mac: ep-mac at 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