diff --git a/llvm/include/llvm/BinaryFormat/MachO.h b/llvm/include/llvm/BinaryFormat/MachO.h
--- a/llvm/include/llvm/BinaryFormat/MachO.h
+++ b/llvm/include/llvm/BinaryFormat/MachO.h
@@ -495,7 +495,8 @@
   PLATFORM_MACCATALYST = 6,
   PLATFORM_IOSSIMULATOR = 7,
   PLATFORM_TVOSSIMULATOR = 8,
-  PLATFORM_WATCHOSSIMULATOR = 9
+  PLATFORM_WATCHOSSIMULATOR = 9,
+  PLATFORM_DRIVERKIT = 10,
 };
 
 // Values for tools enum in build_tool_version.
diff --git a/llvm/include/llvm/Object/MachO.h b/llvm/include/llvm/Object/MachO.h
--- a/llvm/include/llvm/Object/MachO.h
+++ b/llvm/include/llvm/Object/MachO.h
@@ -615,6 +615,7 @@
     case MachO::PLATFORM_IOSSIMULATOR: return "iossimulator";
     case MachO::PLATFORM_TVOSSIMULATOR: return "tvossimulator";
     case MachO::PLATFORM_WATCHOSSIMULATOR: return "watchossimulator";
+    case MachO::PLATFORM_DRIVERKIT: return "driverkit";
     default:
       std::string ret;
       raw_string_ostream ss(ret);
diff --git a/llvm/include/llvm/TextAPI/MachO/Platform.h b/llvm/include/llvm/TextAPI/MachO/Platform.h
--- a/llvm/include/llvm/TextAPI/MachO/Platform.h
+++ b/llvm/include/llvm/TextAPI/MachO/Platform.h
@@ -29,7 +29,8 @@
   macCatalyst = MachO::PLATFORM_MACCATALYST,
   iOSSimulator = MachO::PLATFORM_IOSSIMULATOR,
   tvOSSimulator = MachO::PLATFORM_TVOSSIMULATOR,
-  watchOSSimulator = MachO::PLATFORM_WATCHOSSIMULATOR
+  watchOSSimulator = MachO::PLATFORM_WATCHOSSIMULATOR,
+  driverKit = MachO::PLATFORM_DRIVERKIT,
 };
 
 using PlatformSet = SmallSet<PlatformKind, 3>;
@@ -42,4 +43,4 @@
 } // end namespace MachO.
 } // end namespace llvm.
 
-#endif // LLVM_TEXTAPI_MACHO_PLATFORM_H
\ No newline at end of file
+#endif // LLVM_TEXTAPI_MACHO_PLATFORM_H
diff --git a/llvm/lib/MC/MCAsmStreamer.cpp b/llvm/lib/MC/MCAsmStreamer.cpp
--- a/llvm/lib/MC/MCAsmStreamer.cpp
+++ b/llvm/lib/MC/MCAsmStreamer.cpp
@@ -580,6 +580,7 @@
   case MachO::PLATFORM_IOSSIMULATOR:     return "iossimulator";
   case MachO::PLATFORM_TVOSSIMULATOR:    return "tvossimulator";
   case MachO::PLATFORM_WATCHOSSIMULATOR: return "watchossimulator";
+  case MachO::PLATFORM_DRIVERKIT:        return "driverkit";
   }
   llvm_unreachable("Invalid Mach-O platform type");
 }
diff --git a/llvm/lib/MC/MCParser/DarwinAsmParser.cpp b/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
--- a/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
@@ -1152,6 +1152,7 @@
   case MachO::PLATFORM_IOSSIMULATOR:     /* silence warning */ break;
   case MachO::PLATFORM_TVOSSIMULATOR:    /* silence warning */ break;
   case MachO::PLATFORM_WATCHOSSIMULATOR: /* silence warning */ break;
+  case MachO::PLATFORM_DRIVERKIT:        /* silence warning */ break;
   }
   llvm_unreachable("Invalid mach-o platform type");
 }
diff --git a/llvm/lib/TextAPI/MachO/Platform.cpp b/llvm/lib/TextAPI/MachO/Platform.cpp
--- a/llvm/lib/TextAPI/MachO/Platform.cpp
+++ b/llvm/lib/TextAPI/MachO/Platform.cpp
@@ -83,6 +83,8 @@
     return "tvOS Simulator";
   case PlatformKind::watchOSSimulator:
     return "watchOS Simulator";
+  case PlatformKind::driverKit:
+    return "driverKit";
   }
   llvm_unreachable("Unknown llvm.MachO.PlatformKind enum");
 }
diff --git a/llvm/lib/TextAPI/MachO/Target.cpp b/llvm/lib/TextAPI/MachO/Target.cpp
--- a/llvm/lib/TextAPI/MachO/Target.cpp
+++ b/llvm/lib/TextAPI/MachO/Target.cpp
@@ -33,6 +33,7 @@
                  .Case("ios-simulator", PlatformKind::iOSSimulator)
                  .Case("tvos-simulator", PlatformKind::tvOSSimulator)
                  .Case("watchos-simulator", PlatformKind::watchOSSimulator)
+                 .Case("driverkit", PlatformKind::driverKit)
                  .Default(PlatformKind::unknown);
 
   if (Platform == PlatformKind::unknown) {
diff --git a/llvm/lib/TextAPI/MachO/TextStub.cpp b/llvm/lib/TextAPI/MachO/TextStub.cpp
--- a/llvm/lib/TextAPI/MachO/TextStub.cpp
+++ b/llvm/lib/TextAPI/MachO/TextStub.cpp
@@ -407,6 +407,9 @@
     case PlatformKind::watchOSSimulator:
       OS << "watchos-simulator";
       break;
+    case PlatformKind::driverKit:
+      OS << "driverkit";
+      break;
     }
   }
 
diff --git a/llvm/lib/TextAPI/MachO/TextStubCommon.cpp b/llvm/lib/TextAPI/MachO/TextStubCommon.cpp
--- a/llvm/lib/TextAPI/MachO/TextStubCommon.cpp
+++ b/llvm/lib/TextAPI/MachO/TextStubCommon.cpp
@@ -84,6 +84,9 @@
   case PlatformKind::macCatalyst:
     OS << "iosmac";
     break;
+  case PlatformKind::driverKit:
+    OS << "driverkit";
+    break;
   }
 }
 
diff --git a/llvm/unittests/TextAPI/TextStubV4Tests.cpp b/llvm/unittests/TextAPI/TextStubV4Tests.cpp
--- a/llvm/unittests/TextAPI/TextStubV4Tests.cpp
+++ b/llvm/unittests/TextAPI/TextStubV4Tests.cpp
@@ -758,6 +758,31 @@
             stripWhitespace(Buffer.c_str()));
 }
 
+TEST(TBDv4, Target_i386_driverkit) {
+  static const char TBDv4i386DriverKit[] =
+      "--- !tapi-tbd\n"
+      "tbd-version: 4\n"
+      "targets: [  i386-driverkit  ]\n"
+      "install-name: Test.dylib\n"
+      "...\n";
+
+  Expected<TBDFile> Result =
+      TextAPIReader::get(MemoryBufferRef(TBDv4i386DriverKit, "Test.tbd"));
+  EXPECT_TRUE(!!Result);
+  TBDFile File = std::move(Result.get());
+  EXPECT_EQ(FileType::TBD_V4, File->getFileType());
+  EXPECT_EQ(ArchitectureSet(AK_i386), File->getArchitectures());
+  EXPECT_EQ(File->getPlatforms().size(), 1U);
+  EXPECT_EQ(PlatformKind::driverKit, *File->getPlatforms().begin());
+
+  SmallString<4096> Buffer;
+  raw_svector_ostream OS(Buffer);
+  auto WriteResult = TextAPIWriter::writeToStream(OS, *File);
+  EXPECT_TRUE(!WriteResult);
+  EXPECT_EQ(stripWhitespace(TBDv4i386DriverKit),
+            stripWhitespace(Buffer.c_str()));
+}
+
 TEST(TBDv4, Swift_1) {
   static const char TBDv4SwiftVersion1[] = "--- !tapi-tbd\n"
                                            "tbd-version: 4\n"