linux-kernel - [PATCH 05/11] dt-bindings: document the Qualcomm TEE Shared Memory Bridge

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Message-Id: <20230828192507.117334-6-bartosz.golaszewski@linaro.org>
Date:   Mon, 28 Aug 2023 21:25:01 +0200
From:   Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Alex Elder <elder@...aro.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     kernel@...cinc.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 05/11] dt-bindings: document the Qualcomm TEE Shared Memory Bridge

Add Device Tree bindings for Qualcomm TEE Shared Memory Brige - a
mechanism that allows sharing memory buffers between trustzone and the
kernel.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 .../bindings/firmware/qcom,shm-bridge.yaml    | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/qcom,shm-bridge.yaml

diff --git a/Documentation/devicetree/bindings/firmware/qcom,shm-bridge.yaml b/Documentation/devicetree/bindings/firmware/qcom,shm-bridge.yaml
new file mode 100644
index 000000000000..f660962b7b86
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/qcom,shm-bridge.yaml
@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/qcom,shm-bridge.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: QCOM Shared Memory Bridge
+
+description: |
+  Qualcomm TEE Shared Memory Bridge allows sharing limited areas of kernel's
+  virtual memory with the trustzone in order to avoid mapping the entire RAM.
+
+maintainers:
+  - Bjorn Andersson <andersson@...nel.org>
+  - Konrad Dybcio <konrad.dybcio@...aro.org>
+  - Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - qcom,shm-bridge-sa8775p
+          - qcom,shm-bridge-sm8150
+          - qcom,shm-bridge-sm8450
+      - const: qcom,shm-bridge
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    firmware {
+         compatible = "qcom,shm-bridge-sa8775p", "qcom,shm-bridge";
+    };
-- 
2.39.2