diff --git a/Documentation/devicetree/bindings/reserved-memory/intel,wakeup-mailbox.yaml b/Documentation/devicetree/bindings/reserved-memory/intel,wakeup-mailbox.yaml
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/intel,wakeup-mailbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Wakeup Mailbox for Intel processors
+
+description: |
+  The Wakeup Mailbox provides a mechanism for the operating system to wake up
+  secondary CPUs on Intel processors. It is an alternative to the INIT-!INIT-
+  SIPI sequence used on most x86 systems.
+
+  The structure and operation of the mailbox is described in the Multiprocessor
+  Wakeup Structure of the ACPI specification version 6.6 section 5.2.12.19 [1].
+
+  The implementation of the mailbox in platform firmware is described in the
+  Intel TDX Virtual Firmware Design Guide section 4.3.5 [2].
+
+  1: https://uefi.org/specs/ACPI/6.6/05_ACPI_Software_Programming_Model.html#multiprocessor-wakeup-structure
+  2: https://www.intel.com/content/www/us/en/content-details/733585/intel-tdx-virtual-firmware-design-guide.html
+
+maintainers:
+  - Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
+
+allOf:
+  - $ref: reserved-memory.yaml
+
+properties:
+  compatible:
+    const: intel,wakeup-mailbox
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <2>;
+        #size-cells = <1>;
+
+        wakeup-mailbox@ffff0000 {
+            compatible = "intel,wakeup-mailbox";
+            reg = <0x0 0xffff0000 0x1000>;
+        };
+    };