diff --git a/llvm/tools/opt/NewPMDriver.cpp b/llvm/tools/opt/NewPMDriver.cpp
index 6b66f64b1dc4c..71ebb686a3066 100644
--- a/llvm/tools/opt/NewPMDriver.cpp
+++ b/llvm/tools/opt/NewPMDriver.cpp
@@ -324,7 +324,7 @@ bool llvm::runPassPipeline(StringRef Arg0, Module &M, TargetMachine *TM,
                            TargetLibraryInfoImpl *TLII, ToolOutputFile *Out,
                            ToolOutputFile *ThinLTOLinkOut,
                            ToolOutputFile *OptRemarkFile,
-                           StringRef PassPipeline, ArrayRef<StringRef> Passes,
+                           StringRef PassPipeline,
                            ArrayRef<PassPlugin> PassPlugins,
                            OutputKind OK, VerifierKind VK,
                            bool ShouldPreserveAssemblyUseListOrder,
@@ -448,23 +448,11 @@ bool llvm::runPassPipeline(StringRef Arg0, Module &M, TargetMachine *TM,
 
   // Add passes according to the -passes options.
   if (!PassPipeline.empty()) {
-    assert(Passes.empty() &&
-           "PassPipeline and Passes should not both contain passes");
     if (auto Err = PB.parsePassPipeline(MPM, PassPipeline)) {
       errs() << Arg0 << ": " << toString(std::move(Err)) << "\n";
       return false;
     }
   }
-  // Add passes specified using the legacy PM syntax (i.e. not using
-  // -passes). This should be removed later when such support has been
-  // deprecated, i.e. when all lit tests running opt (and not using
-  // -enable-new-pm=0) have been updated to use -passes.
-  for (auto PassName : Passes) {
-    if (auto Err = PB.parsePassPipeline(MPM, PassName)) {
-      errs() << Arg0 << ": " << toString(std::move(Err)) << "\n";
-      return false;
-    }
-  }
 
   if (VK > VK_NoVerifier)
     MPM.addPass(VerifierPass());
diff --git a/llvm/tools/opt/NewPMDriver.h b/llvm/tools/opt/NewPMDriver.h
index 543f91c383f22..e01179ec611a0 100644
--- a/llvm/tools/opt/NewPMDriver.h
+++ b/llvm/tools/opt/NewPMDriver.h
@@ -71,7 +71,7 @@ void printPasses(raw_ostream &OS);
 bool runPassPipeline(StringRef Arg0, Module &M, TargetMachine *TM,
                      TargetLibraryInfoImpl *TLII, ToolOutputFile *Out,
                      ToolOutputFile *ThinLinkOut, ToolOutputFile *OptRemarkFile,
-                     StringRef PassPipeline, ArrayRef<StringRef> PassInfos,
+                     StringRef PassPipeline,
                      ArrayRef<PassPlugin> PassPlugins, opt_tool::OutputKind OK,
                      opt_tool::VerifierKind VK,
                      bool ShouldPreserveAssemblyUseListOrder,
diff --git a/llvm/tools/opt/opt.cpp b/llvm/tools/opt/opt.cpp
index 12545b3b5c3dc..f7f9fbff8c6fc 100644
--- a/llvm/tools/opt/opt.cpp
+++ b/llvm/tools/opt/opt.cpp
@@ -664,26 +664,19 @@ int main(int argc, char **argv) {
              "-debug-pass-manager, or use the legacy PM (-enable-new-pm=0)\n";
       return 1;
     }
-    if (PassPipeline.getNumOccurrences() > 0 && PassList.size() > 0) {
-      errs()
-          << "Cannot specify passes via both -foo-pass and --passes=foo-pass\n";
-      return 1;
-    }
     auto NumOLevel = OptLevelO0 + OptLevelO1 + OptLevelO2 + OptLevelO3 +
                      OptLevelOs + OptLevelOz;
     if (NumOLevel > 1) {
       errs() << "Cannot specify multiple -O#\n";
       return 1;
     }
-    if (NumOLevel > 0 &&
-        (PassPipeline.getNumOccurrences() > 0 || PassList.size() > 0)) {
+    if (NumOLevel > 0 && (PassPipeline.getNumOccurrences() > 0)) {
       errs() << "Cannot specify -O# and --passes=/--foo-pass, use "
                 "-passes='default<O#>,other-pass'\n";
       return 1;
     }
     std::string Pipeline = PassPipeline;
 
-    SmallVector<StringRef, 4> Passes;
     if (OptLevelO0)
       Pipeline = "default<O0>";
     if (OptLevelO1)
@@ -696,8 +689,6 @@ int main(int argc, char **argv) {
       Pipeline = "default<Os>";
     if (OptLevelOz)
       Pipeline = "default<Oz>";
-    for (const auto &P : PassList)
-      Passes.push_back(P->getPassArgument());
     OutputKind OK = OK_NoOutput;
     if (!NoOutput)
       OK = OutputAssembly
@@ -715,7 +706,7 @@ int main(int argc, char **argv) {
     // layer.
     return runPassPipeline(argv[0], *M, TM.get(), &TLII, Out.get(),
                            ThinLinkOut.get(), RemarksFile.get(), Pipeline,
-                           Passes, PluginList, OK, VK, PreserveAssemblyUseListOrder,
+                           PluginList, OK, VK, PreserveAssemblyUseListOrder,
                            PreserveBitcodeUseListOrder, EmitSummaryIndex,
                            EmitModuleHash, EnableDebugify,
                            VerifyDebugInfoPreserve)