ARM: dts: Add device tree files for hpe gxp soc

The HPE SoC is new to linux. A basic device tree layout with minimum
required for linux to boot including a timer and watchdog support has
been created.

The dts file is empty at this point but will be updated in subsequent
updates as board specific features are enabled.

Signed-off-by: Nick Hawkins <nick.hawkins@hpe.com>
diff --git a/arch/arm/dts/hpe-gxp-u-boot.dtsi b/arch/arm/dts/hpe-gxp-u-boot.dtsi
new file mode 100644
index 0000000..7a2b488
--- /dev/null
+++ b/arch/arm/dts/hpe-gxp-u-boot.dtsi
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree file for HPE GXP
+ */
+
+/include/ "hpe-gxp.dtsi"
+
+/ {
+
+	axi {
+		u-boot,dm-pre-reloc;
+
+		ahb@c0000000 {
+			u-boot,dm-pre-reloc;
+
+			spi0: spi@200 {
+				compatible = "hpe,gxp-spi";
+				reg = <0x200 0x80>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				status = "okay";
+			};
+		};
+	};
+};