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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"; +}; 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