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Date:   Fri, 15 Oct 2021 14:48:40 +0200
From:   Frieder Schrempf <>
        Frieder Schrempf <>,
        Krzysztof Kozlowski <>,,,
        Rob Herring <>,
        Sascha Hauer <>,
        Shawn Guo <>
Cc:, Fabio Estevam <>,
        NXP Linux Team <>,
        Pengutronix Kernel Team <>
Subject: [PATCH v2 6/6] arm64: dts: imx8mm-kontron: Fix connection type for VSC8531 RGMII PHY

From: Frieder Schrempf <>

Previously we falsely relied on the PHY driver to unconditionally
enable the internal RX delay. Since the following fix for the PHY
driver this is not the case anymore:

commit 7b005a1742be ("net: phy: mscc: configure both RX and TX internal
delays for RGMII")

In order to enable the delay we need to set the connection type to
"rgmii-rxid". Without the RX delay the ethernet is not functional at

Fixes: 8668d8b2e67f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and baseboards")
Signed-off-by: Frieder Schrempf <>
Changes in v2:
  * Fix the commit ref in the Fixes tag
  * Extend the commit message to make clear that ethernet is not working
    without this fix.
 arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
index 14263cd40daf..41ddaf980e14 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
@@ -113,7 +113,7 @@ &ecspi3 {
 &fec1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_enet>;
-	phy-connection-type = "rgmii";
+	phy-connection-type = "rgmii-rxid";
 	phy-handle = <&ethphy>;
 	status = "okay";

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