netdev - [PATCH net-next v3 1/3] dt-bindings: net: ethernet-phy: add property tx-amplitude-100base-tx-percent

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Message-Id: <20250204-dp83822-tx-swing-v3-1-9798e96500d9@liebherr.com>
Date: Tue, 04 Feb 2025 14:09:15 +0100
From: Dimitri Fedrau via B4 Relay <devnull+dimitri.fedrau.liebherr.com@...nel.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "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>, Andrew Davis <afd@...com>, 
 Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 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 v3 1/3] dt-bindings: net: ethernet-phy: add
 property tx-amplitude-100base-tx-percent

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

Add property tx-amplitude-100base-tx-percent in the device tree bindings
for configuring the tx amplitude of 100BASE-TX PHYs. Modifying it can be
necessary to compensate losses on the PCB and connector, so the voltages
measured on the RJ45 pins are conforming.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
---
 Documentation/devicetree/bindings/net/ethernet-phy.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
index 2c71454ae8e362e7032e44712949e12da6826070..04f42961035f273990fdf4368ad1352397fc3774 100644
--- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
@@ -232,6 +232,13 @@ properties:
       PHY's that have configurable TX internal delays. If this property is
       present then the PHY applies the TX delay.

+  tx-amplitude-100base-tx-percent:
+    description: |
+      Transmit amplitude gain applied for 100BASE-TX. When omitted, the PHYs
+      default will be left as is.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 100
+
   leds:
     type: object

-- 
2.39.5