linux-kernel - [PATCH v3 3/4] dt-bindings: firmware: Add Qualcomm QSEECOM interface

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Date:   Sun,  5 Mar 2023 03:21:18 +0100
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     Maximilian Luz <luzmaximilian@...il.com>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Johan Hovold <johan@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        Steev Klimaszewski <steev@...i.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH v3 3/4] dt-bindings: firmware: Add Qualcomm QSEECOM interface

Add bindings for the Qualcomm Secure Execution Environment interface
(QSEECOM).

Signed-off-by: Maximilian Luz <luzmaximilian@...il.com>
---

Changes in v3:
 - None.

Changes in v2:
 - Replaces uefisecapp bindings.
 - Fix various dt-checker complaints.

---
 .../bindings/firmware/qcom,qseecom.yaml       | 49 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml

diff --git a/Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml b/Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml
new file mode 100644
index 000000000000..540a604f81bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/qcom,qseecom.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Secure Execution Environment Communication Interface
+
+maintainers:
+  - Maximilian Luz <luzmaximilian@...il.com>
+
+description: |
+  QSEECOM provides an interface to Qualcomm's Secure Execution Environment
+  (SEE) running in the Trust Zone via SCM calls. In particular, it allows
+  communication with secure applications running therein.
+
+  Applications running in this environment can, for example, include
+  'uefisecapp', which is required for accessing UEFI variables on certain
+  systems as these cannot be accessed directly.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - qcom,qseecom-sc8280xp
+      - const: qcom,qseecom
+
+  qcom,scm:
+    $ref: '/schemas/types.yaml#/definitions/phandle'
+    description:
+      A phandle pointing to the QCOM SCM device (see ./qcom,scm.yaml).
+
+required:
+  - compatible
+  - qcom,scm
+
+additionalProperties: false
+
+examples:
+  - |
+    firmware {
+        scm {
+            compatible = "qcom,scm-sc8280xp", "qcom,scm";
+        };
+        qseecom {
+            compatible = "qcom,qseecom-sc8280xp", "qcom,qseecom";
+            qcom,scm = <&scm>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 1545914a592c..ef1f806986e9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17384,6 +17384,7 @@ QUALCOMM SECURE EXECUTION ENVIRONMENT COMMUNICATION DRIVER
 M:	Maximilian Luz <luzmaximilian@...il.com>
 L:	linux-arm-msm@...r.kernel.org
 S:	Maintained
+F:	Documentation/devicetree/bindings/firmware/qcom,qseecom.yaml
 F:	drivers/firmware/qcom_qseecom.c
 F:	include/linux/firmware/qcom/qcom_qseecom.h
 
-- 
2.39.2