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

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Date:   Sat, 11 Nov 2023 19:15:57 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        <christian.koenig@....com>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <jstultz@...gle.com>, <tjmercier@...gle.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Yong Wu <yong.wu@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <jianjiao.zeng@...iatek.com>,
        <kuohong.wang@...iatek.com>,
        Vijayanand Jitta <quic_vjitta@...cinc.com>,
        Joakim Bech <joakim.bech@...aro.org>,
        Jeffrey Kardatzke <jkardatzke@...gle.com>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        <ckoenig.leichtzumerken@...il.com>
Subject: [PATCH v2 6/8] dt-bindings: reserved-memory: Add secure CMA reserved memory range

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@...iatek.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@...iatek.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@...00000 {
+            compatible = "secure_cma_region";
+            reusable;
+            reg = <0x80000000 0x18000000>;
+        };
+    };
-- 
2.25.1