diff --git a/.clang-tidy b/.clang-tidy
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -10,14 +10,8 @@
   # throughout the code base.
   - key:             readability-identifier-naming.FunctionIgnoredRegexp
     value:           "LLVMFuzzerTestOneInput"
-  - key:             readability-identifier-naming.MemberCase
-    value:           CamelCase
-  - key:             readability-identifier-naming.ParameterCase
-    value:           CamelCase
   - key:             readability-identifier-naming.UnionCase
     value:           CamelCase
-  - key:             readability-identifier-naming.VariableCase
-    value:           CamelCase
   - key:             readability-identifier-naming.IgnoreMainLikeFunctions
     value:           1
   - key:             readability-redundant-member-init.IgnoreBaseInCopyConstructors
diff --git a/bolt/.clang-tidy b/bolt/.clang-tidy
new file mode 100644
--- /dev/null
+++ b/bolt/.clang-tidy
@@ -0,0 +1,9 @@
+Checks: 'readability-identifier-naming'
+InheritParentConfig: true
+CheckOptions:
+  - key:             readability-identifier-naming.ParameterCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.UnionCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.VariableCase
+    value:           CamelCase
diff --git a/clang-tools-extra/.clang-tidy b/clang-tools-extra/.clang-tidy
new file mode 100644
--- /dev/null
+++ b/clang-tools-extra/.clang-tidy
@@ -0,0 +1,9 @@
+Checks: 'readability-identifier-naming'
+InheritParentConfig: true
+CheckOptions:
+  - key:             readability-identifier-naming.ParameterCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.UnionCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.VariableCase
+    value:           CamelCase
diff --git a/llvm/.clang-tidy b/llvm/.clang-tidy
--- a/llvm/.clang-tidy
+++ b/llvm/.clang-tidy
@@ -1 +1,9 @@
+Checks: 'readability-identifier-naming'
 InheritParentConfig: true
+CheckOptions:
+  - key:             readability-identifier-naming.ParameterCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.UnionCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.VariableCase
+    value:           CamelCase
diff --git a/polly/.clang-tidy b/polly/.clang-tidy
new file mode 100644
--- /dev/null
+++ b/polly/.clang-tidy
@@ -0,0 +1,9 @@
+Checks: 'readability-identifier-naming'
+InheritParentConfig: true
+CheckOptions:
+  - key:             readability-identifier-naming.ParameterCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.UnionCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.VariableCase
+    value:           CamelCase