netdev - [PATCH 1/2] dt-bindings: dp83867: add binding for ti,output-impedance property

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Message-ID: <20260129-wip-t-remmet-phytec-de-bspimx95-132_upstream-v1-1-8deccd658d16@phytec.de>
Date: Thu, 29 Jan 2026 15:13:33 +0100
From: Teresa Remmet <t.remmet@...tec.de>
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>
CC: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<upstream@...ts.phytec.de>, Yannic Moog <y.moog@...tec.de>, Benjamin Hahn
	<b.hahn@...tec.de>, Yashwanth Varakala <y.varakala@...tec.de>, Jan Remmet
	<j.remmet@...tec.de>
Subject: [PATCH 1/2] dt-bindings: dp83867: add binding for
 ti,output-impedance property

Add an optional device tree property, "ti,output-impedance", which
specifies the output impedance using a raw register field value from
0x0 to 0x1f.

0x0 corresponds to the highest impedance (approximately 70 ohms),
while 0x1f represents the lowest (approximately 35 ohms).

This property allows the impedance to be configured through the
device-tree to any required value rather than being limited to fixed
minimum or maximum settings.

Signed-off-by: Teresa Remmet <t.remmet@...tec.de>
---
 Documentation/devicetree/bindings/net/ti,dp83867.yaml | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.yaml b/Documentation/devicetree/bindings/net/ti,dp83867.yaml
index 4bc1f98fd9fe..a8d8bfb68bee 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83867.yaml
+++ b/Documentation/devicetree/bindings/net/ti,dp83867.yaml
@@ -52,11 +52,20 @@ properties:
     description: |
       MAC Interface Impedance control to set the programmable output impedance
       to a maximum value (70 ohms).
-      Note: Specifying an io_impedance_ctrl nvmem cell or one of the
-        ti,min-output-impedance, ti,max-output-impedance properties
-        are mutually exclusive. If more than one is present, an nvmem
-        cell takes precedence over ti,max-output-impedance, which in
-        turn takes precedence over ti,min-output-impedance.
+      Note: Specifying an io_impedance_ctrl nvmem cell, ti,output-impedance
+        or one of the boolean ti,min-output-impedance and ti,max-output-impedance
+        properties is mutually exclusive.
+        If more than one is present the priority order is nvmem cell,
+        ti,output-impedance, ti,max-output-impedance and last
+        ti,min-output-impedance.
+
+  ti,output-impedance:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      MAC Interface Impedance control to set the raw register value from 0x0
+      (approx. 70 ohms) to 0x1f (approx. 35 ohms).
+    minimum: 0
+    maximum: 31
 
   tx-fifo-depth:
     $ref: /schemas/types.yaml#/definitions/uint32

-- 
2.43.0