diff --git a/src/posix/main.c b/src/posix/main.c
index 7f64959bc..57b4bb39d 100644
--- a/src/posix/main.c
+++ b/src/posix/main.c
@@ -142,15 +142,18 @@ static void PrintUsage(const char *aProgramName, FILE *aStream, int aExitCode)
             "Syntax:\n"
             "    %s [Options] NodeId|Device|Command [DeviceConfig|CommandArgs]\n"
             "Options:\n"
-            "    -I  --interface-name name     Thread network interface name.\n"
             "    -d  --debug-level             Debug level of logging.\n"
+            "    -h  --help                    Display this usage information.\n"
+            "    -I  --interface-name name     Thread network interface name.\n"
             "    -n  --dry-run                 Just verify if arguments is valid and radio spinel is compatible.\n"
             "        --no-reset                Do not send Spinel reset command to RCP on initialization.\n"
             "        --radio-version           Print radio firmware version.\n"
             "        --ncp-dataset             Retrieve and save NCP dataset to file.\n"
             "    -s  --time-speed factor       Time speed up factor.\n"
-            "    -v  --verbose                 Also log to stderr.\n"
+            "    -v  --verbose                 Also log to stderr.\n",
+            aProgramName);
 #if OPENTHREAD_POSIX_RCP_SPI_ENABLE
+    fprintf(aStream,
             "        --gpio-int-dev[=gpio-device-path]\n"
             "                                  Specify a path to the Linux sysfs-exported GPIO device for the\n"
             "                                  `I̅N̅T̅` pin. If not specified, `SPI` interface will fall back to\n"
@@ -171,10 +174,8 @@ static void PrintUsage(const char *aProgramName, FILE *aStream, int aExitCode)
             "        --spi-align-allowance[=n] Specify the maximum number of 0xFF bytes to clip from start of\n"
             "                                  MISO frame. Max value is 16.\n"
             "        --spi-small-packet=[n]    Specify the smallest packet we can receive in a single transaction.\n"
-            "                                  (larger packets will require two transactions). Default value is 32.\n"
+            "                                  (larger packets will require two transactions). Default value is 32.\n");
 #endif
-            "    -h  --help                    Display this usage information.\n",
-            aProgramName);
     exit(aExitCode);
 }
 
@@ -243,7 +244,6 @@ static void ParseArg(int aArgCount, char *aArgVector[], PosixConfig *aConfig)
         case ARG_RESTORE_NCP_DATASET:
             aConfig->mPlatformConfig.mRestoreDatasetFromNcp = true;
             break;
-#if OPENTHREAD_POSIX_RCP_SPI_ENABLE
         case ARG_SPI_GPIO_INT_DEV:
             aConfig->mPlatformConfig.mSpiGpioIntDevice = optarg;
             break;
@@ -260,21 +260,20 @@ static void ParseArg(int aArgCount, char *aArgVector[], PosixConfig *aConfig)
             aConfig->mPlatformConfig.mSpiMode = (uint8_t)atoi(optarg);
             break;
         case ARG_SPI_SPEED:
-            aConfig->mPlatformConfig.mSpiSpeed = atoi(optarg);
+            aConfig->mPlatformConfig.mSpiSpeed = (uint32_t)atoi(optarg);
             break;
         case ARG_SPI_CS_DELAY:
-            aConfig->mPlatformConfig.mSpiCsDelay = atoi(optarg);
+            aConfig->mPlatformConfig.mSpiCsDelay = (uint16_t)atoi(optarg);
             break;
         case ARG_SPI_RESET_DELAY:
-            aConfig->mPlatformConfig.mSpiResetDelay = atoi(optarg);
+            aConfig->mPlatformConfig.mSpiResetDelay = (uint32_t)atoi(optarg);
             break;
         case ARG_SPI_ALIGN_ALLOWANCE:
-            aConfig->mPlatformConfig.mSpiAlignAllowance = atoi(optarg);
+            aConfig->mPlatformConfig.mSpiAlignAllowance = (uint8_t)atoi(optarg);
             break;
         case ARG_SPI_SMALL_PACKET:
-            aConfig->mPlatformConfig.mSpiSmallPacketSize = atoi(optarg);
+            aConfig->mPlatformConfig.mSpiSmallPacketSize = (uint8_t)atoi(optarg);
             break;
-#endif // OPENTHREAD_POSIX_RCP_SPI_ENABLE
         case '?':
             PrintUsage(aArgVector[0], stderr, OT_EXIT_INVALID_ARGUMENTS);
             break;
diff --git a/src/posix/platform/radio_spinel.cpp b/src/posix/platform/radio_spinel.cpp
index 5673f6c68..cdb74c01c 100644
--- a/src/posix/platform/radio_spinel.cpp
+++ b/src/posix/platform/radio_spinel.cpp
@@ -1239,7 +1239,7 @@ otError RadioSpinel::WaitResponse(void)
 {
     uint64_t end = platformGetTime() + kMaxWaitTime * US_PER_MS;
 
-    otLogInfoPlat("Wait response: tid=%u key=%u", mWaitingTid, mWaitingKey);
+    otLogDebgPlat("Wait response: tid=%u key=%u", mWaitingTid, mWaitingKey);
 
     do
     {