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Message-ID: <ece8a3741edd1dacb8b5a3115ba971d9a8167c47.1761324950.git.daniel@makrotopia.org>
Date: Fri, 24 Oct 2025 18:02:52 +0100
From: Daniel Golle <daniel@...rotopia.org>
To: 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>, Simon Horman <horms@...nel.org>,
Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Andreas Schirm <andreas.schirm@...mens.com>,
Lukas Stockmann <lukas.stockmann@...mens.com>,
Alexander Sverdlin <alexander.sverdlin@...mens.com>,
Peter Christen <peter.christen@...mens.com>,
Avinash Jayaraman <ajayaraman@...linear.com>,
Bing tao Xu <bxu@...linear.com>, Liang Xu <lxu@...linear.com>,
Juraj Povazanec <jpovazanec@...linear.com>,
"Fanni (Fang-Yi) Chan" <fchan@...linear.com>,
"Benny (Ying-Tsan) Weng" <yweng@...linear.com>,
"Livia M. Rosu" <lrosu@...linear.com>,
John Crispin <john@...ozen.org>
Subject: [PATCH net-next 06/13] dt-bindings: net: dsa: lantiq,gswip: add
support for MII delay properties
Add support for standard tx-internal-delay-ps and rx-internal-delay-ps
properties on port nodes to allow fine-tuning of RGMII clock delays.
The GSWIP switch hardware supports delay values in 500 picosecond
increments from 0 to 3500 picoseconds, with a default of 2000
picoseconds for both TX and RX delays.
This corresponds to the driver changes that allow adjusting MII delays
using Device Tree properties instead of relying solely on the PHY
interface mode.
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
.../bindings/net/dsa/lantiq,gswip.yaml | 20 +++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
index f3154b19af78..ed274bfb8d49 100644
--- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
@@ -8,6 +8,24 @@ title: Lantiq GSWIP Ethernet switches
allOf:
- $ref: dsa.yaml#/$defs/ethernet-ports
+ - properties:
+ ports:
+ patternProperties:
+ "^port@[0-6]$":
+ type: object
+ properties:
+ tx-internal-delay-ps:
+ enum: [0, 500, 1000, 1500, 2000, 2500, 3000, 3500]
+ default: 2000
+ description:
+ RGMII TX Clock Delay defined in pico seconds.
+ The delay lines adjust the MII clock vs. data timing.
+ rx-internal-delay-ps:
+ enum: [0, 500, 1000, 1500, 2000, 2500, 3000, 3500]
+ default: 2000
+ description:
+ RGMII RX Clock Delay defined in pico seconds.
+ The delay lines adjust the MII clock vs. data timing.
maintainers:
- Hauke Mehrtens <hauke@...ke-m.de>
@@ -115,6 +133,8 @@ examples:
label = "lan3";
phy-mode = "rgmii";
phy-handle = <&phy0>;
+ tx-internal-delay-ps = <2000>;
+ rx-internal-delay-ps = <2000>;
};
port@1 {
--
2.51.0
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