linux-kernel - [PATCH net-next v4 1/2] dt-bindings: net: dsa: lantiq,gswip: add MaxLinear R(G)MII slew rate

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Message-ID: <20260107090019.2257867-2-alexander.sverdlin@siemens.com>
Date: Wed,  7 Jan 2026 10:00:16 +0100
From: "A. Sverdlin" <alexander.sverdlin@...mens.com>
To: netdev@...r.kernel.org
Cc: Alexander Sverdlin <alexander.sverdlin@...mens.com>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>,
	"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>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Daniel Golle <daniel@...rotopia.org>
Subject: [PATCH net-next v4 1/2] dt-bindings: net: dsa: lantiq,gswip: add MaxLinear R(G)MII slew rate

From: Alexander Sverdlin <alexander.sverdlin@...mens.com>

Add new maxlinear,slew-rate-txc and maxlinear,slew-rate-txd uint32
properties. The properties are only applicable for ports in R(G)MII mode
and allow for slew rate reduction in comparison to "normal" default
configuration with the purpose to reduce radiated emissions.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...mens.com>
---
Changelog:
v4:
- separate properties for TXD and TXC pads ("maxlinear," prefix re-appears)
v3:
- use [pinctrl] standard "slew-rate" property as suggested by Rob
  https://lore.kernel.org/all/20251219204324.GA3881969-robh@kernel.org/
v2:
- unchanged

 .../devicetree/bindings/net/dsa/lantiq,gswip.yaml  | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
index 205b683849a53..747106810cc17 100644
--- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
@@ -106,6 +106,20 @@ patternProperties:
         unevaluatedProperties: false
 
         properties:
+          maxlinear,slew-rate-txc:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+            description: |
+              RMII/RGMII TX Clock Slew Rate:
+              0: "Normal"
+              1: "Slow"
+          maxlinear,slew-rate-txd:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1]
+            description: |
+              RMII/RGMII TX Non-Clock PAD Slew Rate:
+              0: "Normal"
+              1: "Slow"
           maxlinear,rmii-refclk-out:
             type: boolean
             description:
-- 
2.52.0