linux-kernel - [PATCH net-next 1/3] dt-bindings: net: ethernet-phy: add property mac-series-termination-ohms

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Message-Id: <20250307-dp83822-mac-impedance-v1-1-bdd85a759b45@liebherr.com>
Date: Fri, 07 Mar 2025 11:30:01 +0100
From: Dimitri Fedrau via B4 Relay <devnull+dimitri.fedrau.liebherr.com@...nel.org>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Florian Fainelli <f.fainelli@...il.com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Dimitri Fedrau <dimitri.fedrau@...bherr.com>, 
 Dimitri Fedrau <dima.fedrau@...il.com>
Subject: [PATCH net-next 1/3] dt-bindings: net: ethernet-phy: add property
 mac-series-termination-ohms

From: Dimitri Fedrau <dimitri.fedrau@...bherr.com>

Add property mac-series-termination-ohms in the device tree bindings for
selecting the resistance value of the builtin series termination resistors
of the PHY. Changing the resistance to an appropriate value can reduce
signal reflections and therefore improve signal quality.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
---
 Documentation/devicetree/bindings/net/ethernet-phy.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
index 824bbe4333b7ed95cc39737d3c334a20aa890f01..4a710315a83ccf15bfc210ae432ae988cf31e04c 100644
--- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
@@ -238,6 +238,11 @@ properties:
       peak-to-peak specified in ANSI X3.263. When omitted, the PHYs default
       will be left as is.

+  mac-series-termination-ohms:
+    description:
+      The resistance value of the series termination resistor. When omitted, the
+      PHYs default will be left as is.
+
   leds:
     type: object

-- 
2.39.5