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charset="utf-8" Disable the PCIe bus in the default device tree to avoid shared regulator conflicts between SDIO and PCIe buses. The non-deterministic probe order between these two buses can break the PCIe initialization sequence, causing PCIe devices to fail detection intermittently. On i.MX8MP EVK board, the M.2 connector is physically wired to both USDHC1 and PCIe0, however the out-of-box module is SDIO IW612 WiFi, so enable the SDIO WiFi in the default imx8mp-evk.dts. Add 'm2_usdhc' label to USDHC1 to support device tree overlay for PCIe modules. Users who need PCIe can use imx8mp-evk-pcie.dtb (added in a follow-up patch) which applies an overlay to enable PCIe and disable USDHC1. Signed-off-by: Sherry Sun --- arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts b/arch/arm64/boot= /dts/freescale/imx8mp-evk.dts index d0a2bd975a18..2feb5b18645c 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts @@ -774,7 +774,7 @@ &pcie0 { vpcie-supply =3D <®_pcie0>; vpcie3v3aux-supply =3D <®_pcie0>; supports-clkreq; - status =3D "okay"; + status =3D "disabled"; }; =20 &pcie0_ep { @@ -870,7 +870,7 @@ &uart3 { status =3D "okay"; }; =20 -&usdhc1 { +m2_usdhc: &usdhc1 { pinctrl-names =3D "default", "state_100mhz", "state_200mhz"; pinctrl-0 =3D <&pinctrl_usdhc1>; pinctrl-1 =3D <&pinctrl_usdhc1_100mhz>; --=20 2.37.1 From nobody Sat Jun 13 14:03:15 2026 Received: from DUZPR83CU001.outbound.protection.outlook.com (mail-northeuropeazon11012057.outbound.protection.outlook.com [52.101.66.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AFDB6342177; 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charset="utf-8" Disable the PCIe bus in the default device tree to avoid shared regulator conflicts between SDIO and PCIe buses. The non-deterministic probe order between these two buses can break the PCIe initialization sequence, causing PCIe devices to fail detection intermittently. On i.MX95-15x15 EVK board, the M.2 connector is physically wired to both USDHC3 and PCIe0, however the out-of-box module is SDIO IW612 WiFi, so enable SDIO WiFi in the default imx95-15x15-evk.dts. Add 'm2_usdhc' label to USDHC3 to support device tree overlay for PCIe modules. Users who need PCIe can use imx95-15x15-evk-pcie.dtb (added in a follow-up patch) which applies an overlay to enable PCIe and disable USDHC3. Signed-off-by: Sherry Sun --- arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts b/arch/arm64= /boot/dts/freescale/imx95-15x15-evk.dts index 7eb12e7d5014..e4649d7f9122 100644 --- a/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts +++ b/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts @@ -557,7 +557,7 @@ &pcie0 { vpcie-supply =3D <®_m2_pwr>; vpcie3v3aux-supply =3D <®_m2_pwr>; supports-clkreq; - status =3D "okay"; + status =3D "disabled"; }; =20 &pcie0_ep { @@ -1137,7 +1137,7 @@ &usdhc2 { status =3D "okay"; }; =20 -&usdhc3 { +m2_usdhc: &usdhc3 { bus-width =3D <4>; keep-power-in-suspend; mmc-pwrseq =3D <&usdhc3_pwrseq>; --=20 2.37.1 From nobody Sat Jun 13 14:03:15 2026 Received: from DUZPR83CU001.outbound.protection.outlook.com (mail-northeuropeazon11012006.outbound.protection.outlook.com [52.101.66.6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E4D63342517; 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charset="utf-8" Some i.MX boards (i.MX8MP EVK and i.MX95-15x15 EVK) have M.2 connectors that are physically wired to both USDHC and PCIe controllers. The default device tree enables USDHC for SDIO WiFi modules and disables PCIe to avoid regulator conflicts. Add a common imx-m2-pcie.dtso that can be applied to enable PCIe and disable USDHC when a PCIe module is installed in the M.2 connector. This creates the following DTB files: - imx8mp-evk-pcie.dtb: i.MX8MP EVK with PCIe enabled - imx95-15x15-evk-pcie.dtb: i.MX95-15x15 EVK with PCIe enabled Signed-off-by: Sherry Sun --- arch/arm64/boot/dts/freescale/Makefile | 9 +++++++-- arch/arm64/boot/dts/freescale/imx-m2-pcie.dtso | 15 +++++++++++++++ 2 files changed, 22 insertions(+), 2 deletions(-) create mode 100644 arch/arm64/boot/dts/freescale/imx-m2-pcie.dtso diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/f= reescale/Makefile index d8378ae07093..56110c1e695b 100644 --- a/arch/arm64/boot/dts/freescale/Makefile +++ b/arch/arm64/boot/dts/freescale/Makefile @@ -360,12 +360,14 @@ imx8mp-evk-lvds0-imx-lvds-hdmi-dtbs +=3D imx8mp-evk.d= tb imx8mp-evk-lvds0-imx-lvds- imx8mp-evk-lvds1-imx-dlvds-hdmi-channel0-dtbs +=3D imx8mp-evk.dtb imx8mp-e= vk-lvds1-imx-dlvds-hdmi-channel0.dtbo imx8mp-evk-lvds1-imx-lvds-hdmi-dtbs +=3D imx8mp-evk.dtb imx8mp-evk-lvds1-i= mx-lvds-hdmi.dtbo imx8mp-evk-mx8-dlvds-lcd1-dtbs +=3D imx8mp-evk.dtb imx8mp-evk-mx8-dlvds-lc= d1.dtbo -imx8mp-evk-pcie-ep-dtbs +=3D imx8mp-evk.dtb imx-pcie0-ep.dtbo +imx8mp-evk-pcie-dtbs +=3D imx8mp-evk.dtb imx-m2-pcie.dtbo +imx8mp-evk-pcie-ep-dtbs +=3D imx8mp-evk-pcie.dtb imx-pcie0-ep.dtbo dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk-lvds0-imx-dlvds-hdmi-channel0.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk-lvds0-imx-lvds-hdmi.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk-lvds1-imx-dlvds-hdmi-channel0.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk-lvds1-imx-lvds-hdmi.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk-mx8-dlvds-lcd1.dtb +dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk-pcie.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx8mp-evk-pcie-ep.dtb =20 imx8mp-tqma8mpql-mba8mpxl-lvds-tm070jvhg33-dtbs +=3D imx8mp-tqma8mpql-mba8= mpxl.dtb imx8mp-tqma8mpql-mba8mpxl-lvds-tm070jvhg33.dtbo @@ -530,7 +532,10 @@ dtb-$(CONFIG_ARCH_MXC) +=3D imx95-verdin-wifi-mallow.d= tb dtb-$(CONFIG_ARCH_MXC) +=3D imx95-verdin-wifi-yavia.dtb dtb-$(CONFIG_ARCH_MXC) +=3D imx95-verdin-wifi-zinnia.dtb =20 -imx95-15x15-evk-pcie0-ep-dtbs =3D imx95-15x15-evk.dtb imx-pcie0-ep.dtbo +imx95-15x15-evk-pcie-dtbs +=3D imx95-15x15-evk.dtb imx-m2-pcie.dtbo +dtb-$(CONFIG_ARCH_MXC) +=3D imx95-15x15-evk-pcie.dtb + +imx95-15x15-evk-pcie0-ep-dtbs =3D imx95-15x15-evk-pcie.dtb imx-pcie0-ep.dt= bo dtb-$(CONFIG_ARCH_MXC) +=3D imx95-15x15-evk-pcie0-ep.dtb imx95-19x19-evk-pcie0-ep-dtbs +=3D imx95-19x19-evk.dtb imx-pcie0-ep.dtbo imx95-19x19-evk-pcie1-ep-dtbs +=3D imx95-19x19-evk.dtb imx-pcie1-ep.dtbo diff --git a/arch/arm64/boot/dts/freescale/imx-m2-pcie.dtso b/arch/arm64/bo= ot/dts/freescale/imx-m2-pcie.dtso new file mode 100644 index 000000000000..1930de058a08 --- /dev/null +++ b/arch/arm64/boot/dts/freescale/imx-m2-pcie.dtso @@ -0,0 +1,15 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Copyright 2026 NXP + */ + +/dts-v1/; +/plugin/; + +&pcie0 { + status =3D "okay"; +}; + +&m2_usdhc { + status =3D "disabled"; +}; --=20 2.37.1