diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
index ea5a30939dca43..6c8467188d28c1 100644
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -269,6 +269,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	seeed-can-fd-hat-v2.dtbo \
 	sh1106-spi.dtbo \
 	si446x-spi0.dtbo \
+	sixfab_m1m.dtbo \
 	smi.dtbo \
 	smi-dev.dtbo \
 	smi-nand.dtbo \
diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index f74f49cb30fb3c..17c608e1e9cf59 100644
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -4822,6 +4822,12 @@ Params: speed                   SPI bus speed (default 4000000)
         reset_pin               GPIO pin for RESET (default 27)
 
 
+Name:   sixfab_m1m
+Info:   Overlay for the Sixfab M1M PCIe Gen3 AI HAT+
+Load:   dtoverlay=sixfab_m1m
+Params: <None>
+
+
 Name:   smi
 Info:   Enables the Secondary Memory Interface peripheral. Uses GPIOs 2-25!
 Load:   dtoverlay=smi
diff --git a/arch/arm/boot/dts/overlays/sixfab_m1m-overlay.dts b/arch/arm/boot/dts/overlays/sixfab_m1m-overlay.dts
new file mode 100644
index 00000000000000..bb25571ff970ad
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/sixfab_m1m-overlay.dts
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/dts-v1/;
+/plugin/;
+/ {
+	compatible = "brcm,bcm2712";
+	fragment@0 {
+		target = <&pciex1>;
+		__overlay__ {
+			status = "okay";
+			max-link-speed = <3>;
+		};
+	};
+};