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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, and provide a > separate device tree overlay (imx8mp-evk-pcie.dtso) to enable the PCIe > bus when needed. > > Signed-off-by: Sherry Sun > --- > Chanegs in V2: > 1. Improve the commit message to clarify SDIO WiFi is the out-of-box module on > i.MX8MP EVK board. > --- > arch/arm64/boot/dts/freescale/Makefile | 4 +++- > .../boot/dts/freescale/imx8mp-evk-pcie.dtso | 19 +++++++++++++++++++ > arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 4 ++-- > 3 files changed, 24 insertions(+), 3 deletions(-) > create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-evk-pcie.dtso > > diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile > index 780682258e71..107ca270ef32 100644 > --- a/arch/arm64/boot/dts/freescale/Makefile > +++ b/arch/arm64/boot/dts/freescale/Makefile > @@ -333,12 +333,14 @@ imx8mp-evk-lvds0-imx-lvds-hdmi-dtbs += imx8mp-evk.dtb imx8mp-evk-lvds0-imx-lvds- > imx8mp-evk-lvds1-imx-dlvds-hdmi-channel0-dtbs += imx8mp-evk.dtb imx8mp-evk-lvds1-imx-dlvds-hdmi-channel0.dtbo > imx8mp-evk-lvds1-imx-lvds-hdmi-dtbs += imx8mp-evk.dtb imx8mp-evk-lvds1-imx-lvds-hdmi.dtbo > imx8mp-evk-mx8-dlvds-lcd1-dtbs += imx8mp-evk.dtb imx8mp-evk-mx8-dlvds-lcd1.dtbo > -imx8mp-evk-pcie-ep-dtbs += imx8mp-evk.dtb imx-pcie0-ep.dtbo > +imx8mp-evk-pcie-dtbs := imx8mp-evk.dtb imx8mp-evk-pcie.dtbo > +imx8mp-evk-pcie-ep-dtbs += imx8mp-evk-pcie.dtb imx-pcie0-ep.dtbo > dtb-$(CONFIG_ARCH_MXC) += imx8mp-evk-lvds0-imx-dlvds-hdmi-channel0.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-evk-lvds0-imx-lvds-hdmi.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-evk-lvds1-imx-dlvds-hdmi-channel0.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-evk-lvds1-imx-lvds-hdmi.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-evk-mx8-dlvds-lcd1.dtb > +dtb-$(CONFIG_ARCH_MXC) += imx8mp-evk-pcie.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-evk-pcie-ep.dtb > > imx8mp-tqma8mpql-mba8mpxl-lvds-tm070jvhg33-dtbs += imx8mp-tqma8mpql-mba8mpxl.dtb imx8mp-tqma8mpql-mba8mpxl-lvds-tm070jvhg33.dtbo > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk-pcie.dtso b/arch/arm64/boot/dts/freescale/imx8mp-evk-pcie.dtso > new file mode 100644 > index 000000000000..4f6546d442bf > --- /dev/null > +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk-pcie.dtso > @@ -0,0 +1,19 @@ > +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) > +/* > + * Copyright 2026 NXP > + */ > + > +/dts-v1/; > +/plugin/; > + > +&pcie_phy { > + status = "okay"; > +}; > + > +&pcie0 { > + status = "okay"; > +}; > + > +&usdhc1 { > + status = "disabled"; > +}; Please use one overlay for both imx95 and imx8mp to enable pcie0 and disable usdhc1. Frank > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts > index aedc09937716..f09335e6388d 100644 > --- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts > +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts > @@ -763,7 +763,7 @@ &pcie_phy { > fsl,refclk-pad-mode = ; > clocks = <&pcie0_refclk>; > clock-names = "ref"; > - status = "okay"; > + status = "disabled"; > }; > > &pcie0 { > @@ -773,7 +773,7 @@ &pcie0 { > vpcie-supply = <®_pcie0>; > vpcie3v3aux-supply = <®_pcie0>; > supports-clkreq; > - status = "okay"; > + status = "disabled"; > }; > > &pcie0_ep { > -- > 2.37.1 >