linux-kernel - [PATCH 4/4] dt-bindings: firmware: Add Qualcomm UEFI Secure Application client

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Date:   Sun, 24 Jul 2022 00:49:49 +0200
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Steev Klimaszewski <steev@...i.org>,
        Shawn Guo <shawn.guo@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, linux-efi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Maximilian Luz <luzmaximilian@...il.com>
Subject: [PATCH 4/4] dt-bindings: firmware: Add Qualcomm UEFI Secure Application client

Add bindings for the Qualcomm Trusted Execution Environment (TrEE) UEFI
Secure application (uefisecapp) client.

Signed-off-by: Maximilian Luz <luzmaximilian@...il.com>
---
 .../firmware/qcom,tee-uefisecapp.yaml         | 38 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/qcom,tee-uefisecapp.yaml

diff --git a/Documentation/devicetree/bindings/firmware/qcom,tee-uefisecapp.yaml b/Documentation/devicetree/bindings/firmware/qcom,tee-uefisecapp.yaml
new file mode 100644
index 000000000000..9e5de1005d5c
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/qcom,tee-uefisecapp.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/qcom/qcom,rpmh-rsc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Trusted Execution Environment UEFI Secure Application
+
+maintainers:
+  - Maximilian Luz <luzmaximilian@...il.com>
+
+description: |
+  Various Qualcomm SoCs do not allow direct access to UEFI variables. Instead,
+  these need to be accessed via the UEFI Secure Application (uefisecapp),
+  residing in the Trusted Execution Environment (TrEE). These bindings mark the
+  presence of uefisecapp and allow the respective client driver to load and
+  install efivar operations, providing the kernel with access to UEFI
+  variables.
+
+properties:
+  compatible:
+    const: qcom,tee-uefisecapp
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    firmware {
+        scm {
+            compatible = "qcom,scm-sc8180x", "qcom,scm";
+        };
+        tee-uefisecapp {
+            compatible = "qcom,tee-uefisecapp";
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 6e014e16fc82..00436245189d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16607,6 +16607,7 @@ QUALCOMM UEFISECAPP DRIVER
 M:	Maximilian Luz <luzmaximilian@...il.com>
 L:	linux-arm-msm@...r.kernel.org
 S:	Maintained
+F:	Documentation/devicetree/bindings/firmware/qcom,tee-uefisecapp.yaml
 F:	drivers/firmware/qcom_tee_uefisecapp.c
 
 QUALCOMM VENUS VIDEO ACCELERATOR DRIVER
-- 
2.37.1