bindings: Snapshot of secure-buffer bindings

Secure-buffer bindings snapshot from msm-6.1 branch
commit 0285b5bf8b6f ("Merge "ARM: dts: msm: Update proxy device
settings"").

Change-Id: I7fab03ca9412cf8f084d75a60343ca033da5d4c4
Signed-off-by: Patrick Daly <quic_pdaly@quicinc.com>

bindings/soc/qcom/qcom,secure-buffer.yaml

@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/soc/qcom/qcom,secure-buffer.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Qualcomm Technologies, Inc. Secure Buffer binding
+
+maintainers:
+  - Chris Goldsworthy
+
+additionalProperties: false
+
+description: |
+  The Secure Buffer driver is used to communicate with the ARMv8
+  secure world (EL2 and EL3) to secure a buffer, so that only the
+  correct clients can use the buffer, and no other entities can
+  access it.
+
+properties:
+  compatible:
+    items:
+      - const: qcom,secure-buffer
+
+  qcom,vmid-cp-camera-preview-ro:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Buffers accessible to VMID_CP_CAMERA_PREVIEW must be mapped with
+      read-only permissions.
+
+required:
+  - compatible
+
+examples:
+  - |
+    qcom,secure-buffer {
+        compatible = "qcom,secure-buffer";
+    };