diff --git a/common/log_console.c b/common/log_console.c
index c27101b8fe2..9376baad664 100644
--- a/common/log_console.c
+++ b/common/log_console.c
@@ -38,10 +38,10 @@ static int log_console_emit(struct log_device *ldev, struct log_rec *rec)
 			printf("%d-", rec->line);
 		if (fmt & BIT(LOGF_FUNC)) {
 			if (CONFIG_IS_ENABLED(USE_TINY_PRINTF)) {
-				printf("%s()", rec->func);
+				printf("%s()", rec->func ?: "?");
 			} else {
 				printf("%*s()", CONFIG_LOGF_FUNC_PAD,
-				       rec->func);
+				       rec->func ?: "?");
 			}
 		}
 	}
diff --git a/common/log_syslog.c b/common/log_syslog.c
index d01bb749c22..0dcb5f7cdea 100644
--- a/common/log_syslog.c
+++ b/common/log_syslog.c
@@ -88,7 +88,7 @@ static int log_syslog_emit(struct log_device *ldev, struct log_rec *rec)
 	if (fmt & BIT(LOGF_LINE))
 		append(&ptr, msg_end, "%d-", rec->line);
 	if (fmt & BIT(LOGF_FUNC))
-		append(&ptr, msg_end, "%s()", rec->func);
+		append(&ptr, msg_end, "%s()", rec->func ?: "?");
 	if (fmt & BIT(LOGF_MSG))
 		append(&ptr, msg_end, "%s%s",
 		       fmt != BIT(LOGF_MSG) ? " " : "", rec->msg);
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 484f9e1bf8d..a50fbce8d06 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -40,6 +40,7 @@ CONFIG_PRE_CONSOLE_BUFFER=y
 CONFIG_LOG=y
 CONFIG_LOG_MAX_LEVEL=9
 CONFIG_LOG_DEFAULT_LEVEL=6
+CONFIG_LOGF_FUNC=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_STACKPROTECTOR=y
 CONFIG_CMD_CPU=y
diff --git a/include/log.h b/include/log.h
index fc0d5984472..69dcb339543 100644
--- a/include/log.h
+++ b/include/log.h
@@ -125,7 +125,7 @@ static inline int log_uc_cat(enum uclass_id id)
  * @level: Level of log record (indicating its severity)
  * @file: File name of file where log record was generated
  * @line: Line number in file where log record was generated
- * @func: Function where log record was generated
+ * @func: Function where log record was generated, NULL if not known
  * @fmt: printf() format string for log record
  * @...: Optional parameters, according to the format string @fmt
  * Return: 0 if log record was emitted, -ve on error
@@ -141,7 +141,7 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
  * @level: Level of log record (indicating its severity)
  * @file: File name of file where log record was generated
  * @line: Line number in file where log record was generated
- * @func: Function where log record was generated
+ * @func: Function where log record was generated, NULL if not known
  * @addr:	Starting address to display at start of line
  * @data:	pointer to data buffer
  * @width:	data value width.  May be 1, 2, or 4.
@@ -193,6 +193,12 @@ int _log_buffer(enum log_category_t cat, enum log_level_t level,
 #define _LOG_DEBUG	0
 #endif
 
+#ifdef CONFIG_LOGF_FUNC
+#define _log_func	__func__
+#else
+#define _log_func	NULL
+#endif
+
 #if CONFIG_IS_ENABLED(LOG)
 
 /* Emit a log record if the level is less that the maximum */
@@ -201,7 +207,7 @@ int _log_buffer(enum log_category_t cat, enum log_level_t level,
 	if (_LOG_DEBUG != 0 || _l <= _LOG_MAX_LEVEL) \
 		_log((enum log_category_t)(_cat), \
 		     (enum log_level_t)(_l | _LOG_DEBUG), __FILE__, \
-		     __LINE__, __func__, \
+		     __LINE__, _log_func, \
 		      pr_fmt(_fmt), ##_args); \
 	})
 
@@ -211,7 +217,7 @@ int _log_buffer(enum log_category_t cat, enum log_level_t level,
 	if (_LOG_DEBUG != 0 || _l <= _LOG_MAX_LEVEL) \
 		_log_buffer((enum log_category_t)(_cat), \
 			    (enum log_level_t)(_l | _LOG_DEBUG), __FILE__, \
-			    __LINE__, __func__, _addr, _data, \
+			    __LINE__, _log_func, _addr, _data, \
 			    _width, _count, _linelen); \
 	})
 #else
@@ -314,7 +320,7 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line,
 #define assert_noisy(x) \
 	({ bool _val = (x); \
 	if (!_val) \
-		__assert_fail(#x, "?", __LINE__, __func__); \
+		__assert_fail(#x, "?", __LINE__, _log_func); \
 	_val; \
 	})
 
diff --git a/test/cmd/pinmux.c b/test/cmd/pinmux.c
index 4253baa5646..7ab7004b684 100644
--- a/test/cmd/pinmux.c
+++ b/test/cmd/pinmux.c
@@ -30,7 +30,13 @@ static int dm_test_cmd_pinmux_status_pinname(struct unit_test_state *uts)
 
 	console_record_reset();
 	run_command("pinmux status P9", 0);
-	ut_assert_nextlinen("single-pinctrl pinctrl-single-no-width: missing register width");
+	if (IS_ENABLED(CONFIG_LOGF_FUNC)) {
+		ut_assert_nextlinen(
+			"   single_of_to_plat() single-pinctrl pinctrl-single-no-width: missing register width");
+	} else {
+		ut_assert_nextlinen(
+			"single-pinctrl pinctrl-single-no-width: missing register width");
+	}
 	ut_assert_nextlinen("P9 not found");
 	ut_assert_console_end();
 
diff --git a/test/log/log_test.c b/test/log/log_test.c
index 855353a9c40..7ef89941d42 100644
--- a/test/log/log_test.c
+++ b/test/log/log_test.c
@@ -452,8 +452,10 @@ int log_test_buffer(struct unit_test_state *uts)
 	/* This one should product no output due to the debug level */
 	log_buffer(LOGC_BOOT, LOGL_DEBUG, 0, buf, 1, 0x12, 0);
 
-	ut_assert_nextline("00000000: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff  ..\"3DUfw........");
-	ut_assert_nextline("00000010: 10 00                                            ..");
+	ut_assert_nextline(
+		"     log_test_buffer() 00000000: 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff  ..\"3DUfw........");
+	ut_assert_nextline(
+		"     log_test_buffer() 00000010: 10 00                                            ..");
 	ut_assert_console_end();
 	free(buf);