Expose the implemented ClusterRevision of Descriptor in a header. (#3…

…1671)

This way SDK consumers can tell what version of that they have.

src/app/clusters/descriptor/descriptor.cpp

@@ -28,6 +28,8 @@
 #include <lib/support/CodeUtils.h>
 #include <lib/support/logging/CHIPLogging.h>
 
+#include "descriptor.h"
+
 using namespace chip;
 using namespace chip::app;
 using namespace chip::app::Clusters;
@@ -45,8 +47,6 @@ class DescriptorAttrAccess : public AttributeAccessInterface
     CHIP_ERROR Read(const ConcreteReadAttributePath & aPath, AttributeValueEncoder & aEncoder) override;
 
 private:
-    static constexpr uint16_t ClusterRevision = 2;
-
     CHIP_ERROR ReadTagListAttribute(EndpointId endpoint, AttributeValueEncoder & aEncoder);
     CHIP_ERROR ReadPartsAttribute(EndpointId endpoint, AttributeValueEncoder & aEncoder);
     CHIP_ERROR ReadDeviceAttribute(EndpointId endpoint, AttributeValueEncoder & aEncoder);
@@ -55,8 +55,6 @@ class DescriptorAttrAccess : public AttributeAccessInterface
     CHIP_ERROR ReadFeatureMap(EndpointId endpoint, AttributeValueEncoder & aEncoder);
 };
 
-constexpr uint16_t DescriptorAttrAccess::ClusterRevision;
-
 CHIP_ERROR DescriptorAttrAccess::ReadFeatureMap(EndpointId endpoint, AttributeValueEncoder & aEncoder)
 {
     Clusters::Descriptor::Structs::SemanticTagStruct::Type tag;
@@ -202,7 +200,7 @@ CHIP_ERROR DescriptorAttrAccess::ReadClientServerAttribute(EndpointId endpoint,
 
 CHIP_ERROR DescriptorAttrAccess::ReadClusterRevision(EndpointId endpoint, AttributeValueEncoder & aEncoder)
 {
-    return aEncoder.Encode(ClusterRevision);
+    return aEncoder.Encode(kClusterRevision);
 }
 
 DescriptorAttrAccess gAttrAccess;

src/app/clusters/descriptor/descriptor.h

@@ -0,0 +1,27 @@
+/**
+ *    Copyright (c) 2024 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+namespace chip {
+namespace app {
+namespace Clusters {
+namespace Descriptor {
+
+inline constexpr uint16_t kClusterRevision = 2;
+
+} // namespace Descriptor
+} // namespace Clusters
+} // namespace app
+} // namespace chip