modules: tfm: disable SECURE_UART when TFM_LOG_LEVEL_SILENCE

Explicitly disable the SECURE_UART TFM define when
`CONFIG_TFM_LOG_LEVEL_SILENCE=y`.

Signed-off-by: Jordan Yates <[email protected]>

Author: JordanYates

modules/trusted-firmware-m/CMakeLists.txt

@@ -154,6 +154,12 @@ if (CONFIG_BUILD_WITH_TFM)
     list(APPEND TFM_CMAKE_ARGS -DTFM_SPM_LOG_LEVEL=${TFM_SPM_LOG_LEVEL})
   endif()
 
+  if (CONFIG_TFM_SECURE_UART)
+    list(APPEND TFM_CMAKE_ARGS -DSECURE_UART1=1)
+  else()
+    list(APPEND TFM_CMAKE_ARGS -DSECURE_UART1=0)
+  endif()
+
   # Enable TFM partitions as specified in Kconfig
   foreach(partition ${TFM_VALID_PARTITIONS})
     if (CONFIG_${partition})

modules/trusted-firmware-m/Kconfig.tfm

@@ -508,6 +508,15 @@ config TFM_SPM_LOG_LEVEL_SILENCE
 	bool "Off"
 endchoice
 
+config TFM_SECURE_UART
+	bool "TF-M configure UART instance as secure peripheral"
+	default y if !TFM_LOG_LEVEL_SILENCE
+	help
+	  Configure the UART instance as a secure peripheral for TF-M logging.
+	  This makes the UART instance unavailable to the non-secure application.
+	  When this option is selected the device tree node for the UART instance
+	  needs to be disabled for the non-secure application.
+
 config TFM_EXCEPTION_INFO_DUMP
 	bool "TF-M exception info dump"
 	default y