diff --git a/examples/platforms/cc2538/diag.c b/examples/platforms/cc2538/diag.c
index 7bbbe7c5b..b5e770d52 100644
--- a/examples/platforms/cc2538/diag.c
+++ b/examples/platforms/cc2538/diag.c
@@ -48,8 +48,8 @@ void otPlatDiagProcess(otInstance *aInstance, int argc, char *argv[], char *aOut
 {
     // Add more plarform specific diagnostics features here.
     snprintf(aOutput, aOutputMaxLen, "diag feature '%s' is not supported\r\n", argv[0]);
-    (void) argc;
-    (void) aInstance;
+    (void)argc;
+    (void)aInstance;
 }
 
 void otPlatDiagModeSet(bool aMode)
@@ -64,22 +64,22 @@ bool otPlatDiagModeGet()
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-    (void) aChannel;
+    (void)aChannel;
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)
 {
-    (void) aTxPower;
+    (void)aTxPower;
 }
 
 void otPlatDiagRadioReceived(otInstance *aInstance, otRadioFrame *aFrame, otError aError)
 {
-    (void) aInstance;
-    (void) aFrame;
-    (void) aError;
+    (void)aInstance;
+    (void)aFrame;
+    (void)aError;
 }
 
 void otPlatDiagAlarmCallback(otInstance *aInstance)
 {
-    (void) aInstance;
+    (void)aInstance;
 }
diff --git a/examples/platforms/cc2650/diag.c b/examples/platforms/cc2650/diag.c
index c59285f61..0c4bc307f 100644
--- a/examples/platforms/cc2650/diag.c
+++ b/examples/platforms/cc2650/diag.c
@@ -31,7 +31,6 @@
 #include <stdio.h>
 #include <openthread/platform/diag.h>
 
-
 /**
  * Diagnostics mode variables.
  *
@@ -46,8 +45,8 @@ void otPlatDiagProcess(otInstance *aInstance, int argc, char *argv[], char *aOut
         snprintf(aOutput, aOutputMaxLen, "diag feature '%s' is not supported\r\n", argv[0]);
     }
 
-    (void) argc;
-    (void) aInstance;
+    (void)argc;
+    (void)aInstance;
 }
 
 void otPlatDiagModeSet(bool aMode)
@@ -62,22 +61,22 @@ bool otPlatDiagModeGet()
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-    (void) aChannel;
+    (void)aChannel;
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)
 {
-    (void) aTxPower;
+    (void)aTxPower;
 }
 
 void otPlatDiagRadioReceived(otInstance *aInstance, otRadioFrame *aFrame, otError aError)
 {
-    (void) aInstance;
-    (void) aFrame;
-    (void) aError;
+    (void)aInstance;
+    (void)aFrame;
+    (void)aError;
 }
 
 void otPlatDiagAlarmCallback(otInstance *aInstance)
 {
-    (void) aInstance;
+    (void)aInstance;
 }
diff --git a/examples/platforms/cc2652/diag.c b/examples/platforms/cc2652/diag.c
index 3923d50b1..28a694f05 100644
--- a/examples/platforms/cc2652/diag.c
+++ b/examples/platforms/cc2652/diag.c
@@ -46,7 +46,7 @@ static bool sDiagMode = false;
 
 void otPlatDiagProcess(otInstance *aInstance, int argc, char *argv[], char *aOutput, size_t aOutputMaxLen)
 {
-    (void) aInstance;
+    (void)aInstance;
 
     // Add more platform specific diagnostics features here.
     if (argc > 1)
@@ -67,22 +67,22 @@ bool otPlatDiagModeGet()
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-    (void) aChannel;
+    (void)aChannel;
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)
 {
-    (void) aTxPower;
+    (void)aTxPower;
 }
 
 void otPlatDiagRadioReceived(otInstance *aInstance, otRadioFrame *aFrame, otError aError)
 {
-    (void) aInstance;
-    (void) aFrame;
-    (void) aError;
+    (void)aInstance;
+    (void)aFrame;
+    (void)aError;
 }
 
 void otPlatDiagAlarmCallback(otInstance *aInstance)
 {
-    (void) aInstance;
+    (void)aInstance;
 }
diff --git a/examples/platforms/efr32/diag.c b/examples/platforms/efr32/diag.c
index 98807d5e6..956da5c41 100644
--- a/examples/platforms/efr32/diag.c
+++ b/examples/platforms/efr32/diag.c
@@ -53,8 +53,8 @@ void otPlatDiagProcess(otInstance *aInstance, int argc, char *argv[], char *aOut
 {
     // Add more plarform specific diagnostics features here.
     snprintf(aOutput, aOutputMaxLen, "diag feature '%s' is not supported\r\n", argv[0]);
-    (void) argc;
-    (void) aInstance;
+    (void)argc;
+    (void)aInstance;
 }
 
 void otPlatDiagModeSet(bool aMode)
@@ -69,22 +69,22 @@ bool otPlatDiagModeGet()
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-    (void) aChannel;
+    (void)aChannel;
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)
 {
-    (void) aTxPower;
+    (void)aTxPower;
 }
 
 void otPlatDiagRadioReceived(otInstance *aInstance, otRadioFrame *aFrame, otError aError)
 {
-    (void) aInstance;
-    (void) aFrame;
-    (void) aError;
+    (void)aInstance;
+    (void)aFrame;
+    (void)aError;
 }
 
 void otPlatDiagAlarmCallback(otInstance *aInstance)
 {
-    (void) aInstance;
+    (void)aInstance;
 }
diff --git a/examples/platforms/efr32/platform-efr32.h b/examples/platforms/efr32/platform-efr32.h
index 5216ee020..f7b29a3cc 100644
--- a/examples/platforms/efr32/platform-efr32.h
+++ b/examples/platforms/efr32/platform-efr32.h
@@ -35,11 +35,11 @@
 #ifndef PLATFORM_EFR32_H_
 #define PLATFORM_EFR32_H_
 
-#include <openthread/config.h>
-#include <openthread-core-config.h>
+#include "core_cm4.h"
 #include "em_device.h"
 #include "em_system.h"
-#include "core_cm4.h"
+#include <openthread-core-config.h>
+#include <openthread/config.h>
 
 // Global OpenThread instance structure
 extern otInstance *sInstance;
@@ -96,4 +96,4 @@ void efr32MiscInit(void);
  */
 void efr32RandomInit(void);
 
-#endif  // PLATFORM_EFR32_H_
+#endif // PLATFORM_EFR32_H_
diff --git a/examples/platforms/gp712/diag.c b/examples/platforms/gp712/diag.c
index a70c5b200..9517e5d5b 100644
--- a/examples/platforms/gp712/diag.c
+++ b/examples/platforms/gp712/diag.c
@@ -46,8 +46,8 @@ void otPlatDiagProcess(otInstance *aInstance, int argc, char *argv[], char *aOut
 {
     // Add more plarform specific diagnostics features here.
     snprintf(aOutput, aOutputMaxLen, "diag feature '%s' is not supported\r\n", argv[0]);
-    (void) argc;
-    (void) aInstance;
+    (void)argc;
+    (void)aInstance;
 }
 
 void otPlatDiagModeSet(bool aMode)
@@ -62,22 +62,22 @@ bool otPlatDiagModeGet()
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-    (void) aChannel;
+    (void)aChannel;
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)
 {
-    (void) aTxPower;
+    (void)aTxPower;
 }
 
 void otPlatDiagRadioReceived(otInstance *aInstance, otRadioFrame *aFrame, otError aError)
 {
-    (void) aInstance;
-    (void) aFrame;
-    (void) aError;
+    (void)aInstance;
+    (void)aFrame;
+    (void)aError;
 }
 
 void otPlatDiagAlarmCallback(otInstance *aInstance)
 {
-    (void) aInstance;
+    (void)aInstance;
 }
diff --git a/examples/platforms/kw41z/diag.c b/examples/platforms/kw41z/diag.c
index 6f4d9c664..2a592b084 100644
--- a/examples/platforms/kw41z/diag.c
+++ b/examples/platforms/kw41z/diag.c
@@ -32,10 +32,10 @@
  *
  */
 
-#include <stdint.h>
-#include <string.h>
-#include <stdio.h>
 #include "fsl_device_registers.h"
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
 #include "openthread/openthread.h"
 
 #include "openthread/platform/alarm-milli.h"
@@ -51,8 +51,8 @@ void otPlatDiagProcess(otInstance *aInstance, int argc, char *argv[], char *aOut
 {
     // Add more plarform specific diagnostics features here.
     snprintf(aOutput, aOutputMaxLen, "diag feature '%s' is not supported\r\n", argv[0]);
-    (void) argc;
-    (void) aInstance;
+    (void)argc;
+    (void)aInstance;
 }
 
 void otPlatDiagModeSet(bool aMode)
@@ -67,22 +67,22 @@ bool otPlatDiagModeGet()
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-    (void) aChannel;
+    (void)aChannel;
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)
 {
-    (void) aTxPower;
+    (void)aTxPower;
 }
 
 void otPlatDiagRadioReceived(otInstance *aInstance, otRadioFrame *aFrame, otError aError)
 {
-    (void) aInstance;
-    (void) aFrame;
-    (void) aError;
+    (void)aInstance;
+    (void)aFrame;
+    (void)aError;
 }
 
 void otPlatDiagAlarmCallback(otInstance *aInstance)
 {
-    (void) aInstance;
+    (void)aInstance;
 }
diff --git a/examples/platforms/posix/diag.c b/examples/platforms/posix/diag.c
index 662a7f9ad..0c16685f6 100644
--- a/examples/platforms/posix/diag.c
+++ b/examples/platforms/posix/diag.c
@@ -48,8 +48,8 @@ void otPlatDiagProcess(otInstance *aInstance, int argc, char *argv[], char *aOut
 {
     // Add more plarform specific diagnostics features here.
     snprintf(aOutput, aOutputMaxLen, "diag feature '%s' is not supported\r\n", argv[0]);
-    (void) argc;
-    (void) aInstance;
+    (void)argc;
+    (void)aInstance;
 }
 
 void otPlatDiagModeSet(bool aMode)
@@ -64,22 +64,22 @@ bool otPlatDiagModeGet()
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-    (void) aChannel;
+    (void)aChannel;
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)
 {
-    (void) aTxPower;
+    (void)aTxPower;
 }
 
 void otPlatDiagRadioReceived(otInstance *aInstance, otRadioFrame *aFrame, otError aError)
 {
-    (void) aInstance;
-    (void) aFrame;
-    (void) aError;
+    (void)aInstance;
+    (void)aFrame;
+    (void)aError;
 }
 
 void otPlatDiagAlarmCallback(otInstance *aInstance)
 {
-    (void) aInstance;
+    (void)aInstance;
 }
diff --git a/examples/platforms/posix/spi-stubs.c b/examples/platforms/posix/spi-stubs.c
index e4db9f111..d0070bf91 100644
--- a/examples/platforms/posix/spi-stubs.c
+++ b/examples/platforms/posix/spi-stubs.c
@@ -37,7 +37,8 @@
 // Spi-slave stubs
 
 otError otPlatSpiSlaveEnable(otPlatSpiSlaveTransactionCompleteCallback aCompleteCallback,
-                             otPlatSpiSlaveTransactionProcessCallback aProcessCallback, void *aContext)
+                             otPlatSpiSlaveTransactionProcessCallback  aProcessCallback,
+                             void *                                    aContext)
 {
     (void)aCompleteCallback;
     (void)aProcessCallback;
@@ -53,8 +54,11 @@ void otPlatSpiSlaveDisable(void)
 {
 }
 
-otError otPlatSpiSlavePrepareTransaction(uint8_t *aOutputBuf, uint16_t aOutputBufLen, uint8_t *aInputBuf,
-                                         uint16_t aInputBufLen, bool aRequestTransactionFlag)
+otError otPlatSpiSlavePrepareTransaction(uint8_t *aOutputBuf,
+                                         uint16_t aOutputBufLen,
+                                         uint8_t *aInputBuf,
+                                         uint16_t aInputBufLen,
+                                         bool     aRequestTransactionFlag)
 {
     (void)aOutputBuf;
     (void)aOutputBufLen;
diff --git a/examples/platforms/samr21/diag.c b/examples/platforms/samr21/diag.c
index 154db23d7..5a74c9d8c 100644
--- a/examples/platforms/samr21/diag.c
+++ b/examples/platforms/samr21/diag.c
@@ -44,8 +44,8 @@ static bool sDiagMode = false;
 
 void otPlatDiagProcess(otInstance *aInstance, int argc, char *argv[], char *aOutput, size_t aOutputMaxLen)
 {
-    (void) argc;
-    (void) aInstance;
+    (void)argc;
+    (void)aInstance;
 
     // Add more plarform specific diagnostics features here.
     snprintf(aOutput, aOutputMaxLen, "diag feature '%s' is not supported\r\n", argv[0]);
@@ -63,22 +63,22 @@ bool otPlatDiagModeGet()
 
 void otPlatDiagChannelSet(uint8_t aChannel)
 {
-    (void) aChannel;
+    (void)aChannel;
 }
 
 void otPlatDiagTxPowerSet(int8_t aTxPower)
 {
-    (void) aTxPower;
+    (void)aTxPower;
 }
 
 void otPlatDiagRadioReceived(otInstance *aInstance, otRadioFrame *aFrame, otError aError)
 {
-    (void) aInstance;
-    (void) aFrame;
-    (void) aError;
+    (void)aInstance;
+    (void)aFrame;
+    (void)aError;
 }
 
 void otPlatDiagAlarmCallback(otInstance *aInstance)
 {
-    (void) aInstance;
+    (void)aInstance;
 }
diff --git a/tests/unit/test_diag.cpp b/tests/unit/test_diag.cpp
index cfbcb7f77..01d0cfd2a 100644
--- a/tests/unit/test_diag.cpp
+++ b/tests/unit/test_diag.cpp
@@ -61,7 +61,7 @@ extern "C" void otPlatAlarmMicroFired(otInstance *)
 {
 }
 
-extern "C" void otPlatRadioTxDone(otInstance *, otRadioFrame *aFrame, otRadioFrame *aAckFrame,  otError aError)
+extern "C" void otPlatRadioTxDone(otInstance *, otRadioFrame *aFrame, otRadioFrame *aAckFrame, otError aError)
 {
     (void)aFrame;
     (void)aAckFrame;
@@ -76,7 +76,7 @@ extern "C" void otPlatRadioReceiveDone(otInstance *, otRadioFrame *aFrame, otErr
 
 extern "C" void otPlatRadioTxStarted(otInstance *, otRadioFrame *aFrame)
 {
-    (void) aFrame;
+    (void)aFrame;
 }
 
 /**
@@ -98,7 +98,7 @@ const char *MakePrintable(const char *aString)
         // two for encoding the current char (in case it needs a backslash)
         // and two for the ending `"` and null char.
 
-        char c = *aString++;
+        char c            = *aString++;
         bool addBackslash = true;
 
         switch (c)
@@ -140,7 +140,7 @@ const char *MakePrintable(const char *aString)
     }
 
     *ptr++ = '\"';
-    *ptr = 0;
+    *ptr   = 0;
 
     return printableString;
 }
@@ -153,8 +153,7 @@ void TestDiag(void)
         const char *mExpectedOutput;
     };
 
-    static const TestCommand tests[] =
-    {
+    static const TestCommand tests[] = {
 
         {
             "diag\n",
@@ -205,16 +204,14 @@ void TestDiag(void)
             "sending 0x14 packet(s), length 0x64\r\nstatus 0x00\r\n",
         },
         {
-            "  diag \t send    \t 20\t100",           // Check parsing of extra space chars between args
+            "  diag \t send    \t 20\t100", // Check parsing of extra space chars between args
             "sending 0x14 packet(s), length 0x64\r\nstatus 0x00\r\n",
         },
-        {
-            "diag repeat 100 100\n",
-            "sending packets of length 0x64 at the delay of 0x64 ms\r\nstatus 0x00\r\n"
-        },
+        {"diag repeat 100 100\n", "sending packets of length 0x64 at the delay of 0x64 ms\r\nstatus 0x00\r\n"},
         {
             "diag stop\n",
-            "received packets: 0\r\nsent packets: 0\r\nfirst received packet: rssi=0, lqi=0\r\n\nstop diagnostics mode\r\nstatus 0x00\r\n",
+            "received packets: 0\r\nsent packets: 0\r\nfirst received packet: rssi=0, lqi=0\r\n\nstop diagnostics "
+            "mode\r\nstatus 0x00\r\n",
         },
         {
             "diag",
@@ -227,11 +224,10 @@ void TestDiag(void)
         {
             NULL,
             NULL,
-        }
-    };
+        }};
 
     // initialize platform layer
-    int argc = 2;
+    int   argc    = 2;
     char *argv[8] = {(char *)"test_diag", (char *)"1"};
     PlatformInit(argc, argv);