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

[Public]

Hi,

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

quoted

quoted

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+        // 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.

quoted

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