From: Daniel Golle Date: Mon, 3 Nov 2025 12:19:58 +0000 (+0000) Subject: dt-bindings: net: dsa: lantiq,gswip: add support for MII delay properties X-Git-Tag: v6.19-rc1~170^2~220^2~4 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=bea0c17786116141aaf3980dc73758e3cc0d2748;p=thirdparty%2Fkernel%2Flinux.git 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 post-reset default of 2000 picoseconds for both TX and RX delays. The driver currently sets the delay to 0 in case the PHY is setup to carry out the delay by the corresponding interface modes ("rgmii-id", "rgmii-rxid", "rgmii-txid"). 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 Reviewed-by: Krzysztof Kozlowski Link: https://patch.msgid.link/9e007d4f85c2c6d69e0b91f3663d99e0f6fc8eac.1762170107.git.daniel@makrotopia.org Signed-off-by: Jakub Kicinski --- diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml index 809d0e9d0a15b..929f6f8e4534b 100644 --- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml +++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml @@ -104,6 +104,20 @@ patternProperties: description: Configure the RMII reference clock to be a clock output rather than an input. Only applicable for RMII mode. + tx-internal-delay-ps: + enum: [0, 500, 1000, 1500, 2000, 2500, 3000, 3500] + description: + RGMII TX Clock Delay defined in pico seconds. + The delay lines adjust the MII clock vs. data timing. + If this property is not present the delay is determined by + the interface mode. + rx-internal-delay-ps: + enum: [0, 500, 1000, 1500, 2000, 2500, 3000, 3500] + description: + RGMII RX Clock Delay defined in pico seconds. + The delay lines adjust the MII clock vs. data timing. + If this property is not present the delay is determined by + the interface mode. required: - compatible @@ -127,8 +141,10 @@ examples: port@0 { reg = <0>; label = "lan3"; - phy-mode = "rgmii"; + phy-mode = "rgmii-id"; phy-handle = <&phy0>; + tx-internal-delay-ps = <2000>; + rx-internal-delay-ps = <2000>; }; port@1 {