[v5,1/9] dt-bindings: reserved-memory: Add mediatek,dynamic-restricted-region

Message ID 20240515112308.10171-2-yong.wu@mediatek.com (mailing list archive)
State New
Headers
Series dma-buf: heaps: Add restricted heap |

Commit Message

Yong Wu May 15, 2024, 11:23 a.m. UTC
  Add a binding for describing the dynamic restricted 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-restricted-region.yaml   | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-restricted-region.yaml
  

Patch

diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-restricted-region.yaml b/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-restricted-region.yaml
new file mode 100644
index 000000000000..5cbe3a5637fa
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,dynamic-restricted-region.yaml
@@ -0,0 +1,43 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/mediatek,dynamic-restricted-region.yaml#
+$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-restricted-region
+
+required:
+  - compatible
+  - reg
+  - reusable
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        reserved-memory@80000000 {
+            compatible = "mediatek,dynamic-restricted-region";
+            reg = <0x80000000 0x18000000>;
+            reusable;
+        };
+    };