[PATCH V3 3/3] arm64: dts: imx: Add common imx-m2-pcie.dtso to enable PCIe on M.2 connector

Sherry Sun
2026-03-25T08:31:10Z

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 <sherry.sun@nxp.com>
---
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/freescale/Makefile
index 155213c45319..1f542324b4fc 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 imx-m2-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
@@ -481,7 +483,10 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-19x19-evk-sof.dtb
dtb-$(CONFIG_ARCH_MXC) += imx95-toradex-smarc-dev.dtb
dtb-$(CONFIG_ARCH_MXC) += imx95-tqma9596sa-mb-smarc-2.dtb

-imx95-15x15-evk-pcie0-ep-dtbs = imx95-15x15-evk.dtb imx-pcie0-ep.dtbo
+imx95-15x15-evk-pcie-dtbs += imx95-15x15-evk.dtb imx-m2-pcie.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-evk-pcie.dtb
+
+imx95-15x15-evk-pcie0-ep-dtbs = imx95-15x15-evk-pcie.dtb imx-pcie0-ep.dtbo
dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-evk-pcie0-ep.dtb
imx95-19x19-evk-pcie0-ep-dtbs += imx95-19x19-evk.dtb imx-pcie0-ep.dtbo
imx95-19x19-evk-pcie1-ep-dtbs += imx95-19x19-evk.dtb imx-pcie1-ep.dtbo
diff --git a/arch/arm64/boot/dts/freescale/imx-m2-pcie.dtso b/arch/arm64/boot/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 = "okay";
+};
+
+&m2_usdhc {
+ status = "disabled";
+};
--
2.37.1