FROMLIST: dt-bindings: hypervisor: Add MediaTek GenieZone hypervisor

From: "Yingshiuan Pan" <yingshiuan.pan@mediatek.com>

Add documentation for GenieZone(gzvm) node. This node informs gzvm
driver to start probing if proprietary geniezone hypervisor firmware is
available and capable of executing virtual machine operations.

[Reason to use dt solution]
The GenieZone hypervisor acts as a vendor firmware to enable platform
virtualization, offering an implementation that is independent of
Linux-specific implementations.
- Previously, our approach involved probing via hypercalls to detect the
  presence of our hypervisor firmware. However, this method raised
  concerns about potential impacts on all systems, including those
  without the embedded GenieZone hypervisor.[1]
- By utilizing the device tree solution, we can accurately identify the
  GenieZone hypervisor's presence without relying on hypercalls,
  ensuring a more targeted and efficient detection process that
  minimizes the risk of unintended consequences on non-GenieZone systems.

[1] https://lore.kernel.org/all/2fe0c7f9-55fc-ae63-3631-8526a0212ccd@linaro.org/

Change-Id: I8ab532ca44bdefc2935dde554eeb8eaae828d24c
Signed-off-by: Yingshiuan Pan <yingshiuan.pan@mediatek.com>
Co-developed-by: Yi-De Wu <yi-de.wu@mediatek.com>
Signed-off-by: Yi-De Wu <yi-de.wu@mediatek.com>
Signed-off-by: Liju Chen <liju-clr.chen@mediatek.com>
Bug: 343838587
Link: https://lore.kernel.org/all/20240529084239.11478-4-liju-clr.chen@mediatek.com/

Documentation/devicetree/bindings/firmware/mediatek,geniezone.yaml

@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/mediatek,geniezone.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek GenieZone hypervisor
+
+maintainers:
+  - Yingshiuan Pan <yingshiuan.pan@mediatek.com>
+
+description:
+  GenieZone is a proprietary type-II hypervisor firmware developed by MediaTek,
+  providing an isolated execution environment for mTEE (MediaTek Trusted
+  Execution Environment) and AVF (Android Virtualization Framework) virtual
+  machines. This binding facilitates the integration of GenieZone into the
+  Android Virtualization Framework (AVF) with Crosvm as the VMM. The driver
+  exposes hypervisor control interfaces to the VMM for managing virtual
+  machine lifecycles and assisting virtual device emulation.
+
+properties:
+  compatible:
+    const: mediatek,geniezone
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    hypervisor {
+        compatible = "mediatek,geniezone";
+    };

MAINTAINERS

@@ -8797,6 +8797,7 @@ GENIEZONE HYPERVISOR DRIVER
 M:	Yingshiuan Pan <yingshiuan.pan@mediatek.com>
 M:	Ze-Yu Wang <ze-yu.wang@mediatek.com>
 M:	Yi-De Wu <yi-de.wu@mediatek.com>
+F:	Documentation/devicetree/bindings/firmware/mediatek,geniezone.yaml
 F:	Documentation/virt/geniezone/
 F:	arch/arm64/geniezone/
 F:	drivers/virt/geniezone/