linux-kernel - [PATCH] dt-bindings: arm: firmware: Convert linaro,optee-tz to json schema

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Message-ID: <20210416222518.15801-1-nm@ti.com>
Date:   Fri, 16 Apr 2021 17:25:18 -0500
From:   Nishanth Menon <nm@...com>
To:     Jens Wiklander <jens.wiklander@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, Nishanth Menon <nm@...com>
Subject: [PATCH] dt-bindings: arm: firmware: Convert linaro,optee-tz to json schema

Convert linaro,optee-tz to json schema format for better documentation
and error checks.

NOTE:
1. This change does introduce a stricter naming convention for
   optee nodes.
2. We do have false positive checkpatch warning with this patch:
   "DT binding docs and includes should be a separate patch"

Signed-off-by: Nishanth Menon <nm@...com>
---
 .../bindings/arm/firmware/linaro,optee-tz.txt | 31 ----------
 .../arm/firmware/linaro,optee-tz.yaml         | 62 +++++++++++++++++++
 2 files changed, 62 insertions(+), 31 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
 create mode 100644 Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml

diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
deleted file mode 100644
index d38834c67dff..000000000000
--- a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
+++ /dev/null
@@ -1,31 +0,0 @@
-OP-TEE Device Tree Bindings
-
-OP-TEE is a piece of software using hardware features to provide a Trusted
-Execution Environment. The security can be provided with ARM TrustZone, but
-also by virtualization or a separate chip.
-
-We're using "linaro" as the first part of the compatible property for
-the reference implementation maintained by Linaro.
-
-* OP-TEE based on ARM TrustZone required properties:
-
-- compatible     : should contain "linaro,optee-tz"
-
-- method         : The method of calling the OP-TEE Trusted OS. Permitted
-                   values are:
-
-                   "smc" : SMC #0, with the register assignments specified
-		           in drivers/tee/optee/optee_smc.h
-
-                   "hvc" : HVC #0, with the register assignments specified
-		           in drivers/tee/optee/optee_smc.h
-
-
-
-Example:
-	firmware {
-		optee {
-			compatible = "linaro,optee-tz";
-			method = "smc";
-		};
-	};
diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
new file mode 100644
index 000000000000..6513b5ac8b2c
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/firmware/linaro,optee-tz.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: OP-TEE Device Tree Bindings
+
+maintainers:
+  - Jens Wiklander <jens.wiklander@...aro.org>
+
+description: |
+  OP-TEE is a piece of software using hardware features to provide a Trusted
+  Execution Environment. The security can be provided with ARM TrustZone, but
+  also by virtualization or a separate chip.
+
+  We're using "linaro" as the first part of the compatible property for
+  the reference implementation maintained by Linaro.
+
+properties:
+  $nodename:
+    const: 'optee'
+
+  compatible:
+    const: linaro,optee-tz
+
+  method:
+    description: The method of calling the OP-TEE Trusted OS.
+    oneOf:
+      - description: |
+          SMC #0, with the register assignments specified
+          in drivers/tee/optee/optee_smc.h
+        items:
+          - const: smc
+      - description: |
+          HVC #0, with the register assignments specified
+          in drivers/tee/optee/optee_smc.h
+        items:
+          - const: hvc
+
+required:
+  - compatible
+  - method
+
+additionalProperties: false
+
+examples:
+  - |
+    firmware  {
+        optee  {
+            compatible = "linaro,optee-tz";
+            method = "smc";
+        };
+    };
+
+  - |
+    firmware  {
+        optee  {
+            compatible = "linaro,optee-tz";
+            method = "hvc";
+        };
+    };
-- 
2.31.0