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[v3,1/7] dt-bindings: reserved-memory: Add mediatek,dynamic-secure-region

Message ID 20231212024607.3681-2-yong.wu@mediatek.com
State New
Headers
Series dma-buf: heaps: Add secure heap |

Commit Message

Yong Wu Dec. 12, 2023, 2:46 a.m. UTC 
  Add a binding for describing the dynamic secure 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. Regarding to the detail TEE command, Please search
MTK_TZCMD_SECMEM_ZALLOC and MTK_TZCMD_SECMEM_FREE.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 .../mediatek,dynamic-secure-region.yaml       | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-secure-region.yaml
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Patch

diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-secure-region.yaml b/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-secure-region.yaml
new file mode 100644
index 000000000000..4a735aeafc62
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-secure-region.yaml
@@ -0,0 +1,43 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/mediatek,dynamic-secure-region.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Dynamic Reserved Region
+
+description:
+  A memory region that can dynamically transition as a whole between
+  secure and non-secure states. This memory will be protected by OP-TEE
+  when allocations are active and unprotected otherwise.
+
+maintainers:
+  - Yong Wu <yong.wu@mediatek.com>
+
+allOf:
+  - $ref: reserved-memory.yaml
+
+properties:
+  compatible:
+    const: mediatek,dynamic-secure-region
+
+required:
+  - compatible
+  - reg
+  - reusable
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        reserved-memory@80000000 {
+            compatible = "mediatek,dynamic-secure-region";
+            reg = <0x80000000 0x18000000>;
+            reusable;
+        };
+    };