linux-kernel - [PATCH 3/3] arm64: dts: freescale: tx8p-ml81: fix eqos nvmem-cells

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Message-Id: <20251114-disp_fix-v1-3-49cbe826afc2@gocontroll.com>
Date: Fri, 14 Nov 2025 15:11:51 +0100
From: Maud Spierings via B4 Relay <devnull+maudspierings.gocontroll.com@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 Maud Spierings <maudspierings@...ontroll.com>
Subject: [PATCH 3/3] arm64: dts: freescale: tx8p-ml81: fix eqos nvmem-cells

From: Maud Spierings <maudspierings@...ontroll.com>

On this SoM eqos is the primary ethernet interface, Ka-Ro fuses the
address for it in eth_mac1, eth_mac2 seems to be left unfused. In their
downstream u-boot they fetch it from eth_mac1 [1][2], by setting alias
of eqos to ethernet0, the driver then fetches the mac address based on
the alias number.

Set eqos to read from eth_mac1 instead of eth_mac2. Also set fec to
point at eth_mac2 as it may be fused later even though it is disabled
by default.

With this changed barebox is now capable of loading the correct address.

Link: https://github.com/karo-electronics/karo-tx-uboot/blob/380543278410bbf04264d80a3bfbe340b8e62439/drivers/net/dwc_eth_qos.c#L1167 [1]
Link: https://github.com/karo-electronics/karo-tx-uboot/blob/380543278410bbf04264d80a3bfbe340b8e62439/arch/arm/dts/imx8mp-karo.dtsi#L12 [2]

Fixes: bac63d7c5f46 ("arm64: dts: freescale: add Ka-Ro Electronics tx8p-ml81 COM")
Signed-off-by: Maud Spierings <maudspierings@...ontroll.com>
---
 arch/arm64/boot/dts/freescale/imx8mp-tx8p-ml81.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-tx8p-ml81.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-tx8p-ml81.dtsi
index fe8ba16eb40e..761ee046eb72 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-tx8p-ml81.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-tx8p-ml81.dtsi
@@ -47,6 +47,7 @@ &eqos {
 				 <&clk IMX8MP_SYS_PLL2_100M>,
 				 <&clk IMX8MP_SYS_PLL2_50M>;
 	assigned-clock-rates = <266000000>, <100000000>, <50000000>;
+	nvmem-cells = <&eth_mac1>;
 	phy-handle = <&ethphy0>;
 	phy-mode = "rmii";
 	pinctrl-0 = <&pinctrl_eqos>;
@@ -75,6 +76,10 @@ ethphy0: ethernet-phy@0 {
 	};
 };
 
+&fec {
+	nvmem-cells = <&eth_mac2>;
+};
+
 &gpio1 {
 	gpio-line-names = "SODIMM_152",
 			  "SODIMM_42",

-- 
2.51.2