[PATCH v2 6/8] dt-bindings: reserved-memory: Add secure CMA reserved memory range

[Yong Wu <yong.wu@mediatek.com>]

Add a binding for describing the secure CMA reserved memory range. The
memory range also will be defined in the TEE firmware. It means the TEE
will be configured with the same address/size that is being set in this
DT node.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 .../reserved-memory/secure_cma_region.yaml    | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/secure_cma_region.yaml

diff --git a/Documentation/devicetree/bindings/reserved-memory/secure_cma_region.yaml b/Documentation/devicetree/bindings/reserved-memory/secure_cma_region.yaml
new file mode 100644
index 000000000000..8ab559595fbe
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/secure_cma_region.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/secure_cma_region.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Secure Reserved CMA Region
+
+description:
+  This binding describes a CMA region that can dynamically transition
+between secure and non-secure states that a TEE can allocate memory
+from.
+
+maintainers:
+  - Yong Wu <yong.wu@mediatek.com>
+
+allOf:
+  - $ref: reserved-memory.yaml
+
+properties:
+  compatible:
+    const: secure_cma_region
+
+required:
+  - compatible
+  - reg
+  - reusable
+
+unevaluatedProperties: false
+
+examples:
+  - |
+
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        reserved-memory@80000000 {
+            compatible = "secure_cma_region";
+            reusable;
+            reg = <0x80000000 0x18000000>;
+        };
+    };
-- 
2.25.1