diff --git a/Libraries/PeriphDrivers/Include/MAX32570/rtc.h b/Libraries/PeriphDrivers/Include/MAX32570/rtc.h
index 838b9e829b..fa132065f9 100644
--- a/Libraries/PeriphDrivers/Include/MAX32570/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32570/rtc.h
@@ -104,6 +104,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX32572/rtc.h b/Libraries/PeriphDrivers/Include/MAX32572/rtc.h
index 3eae22a8e1..cf168464c7 100644
--- a/Libraries/PeriphDrivers/Include/MAX32572/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32572/rtc.h
@@ -107,6 +107,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX32650/rtc.h b/Libraries/PeriphDrivers/Include/MAX32650/rtc.h
index 7fba1e6744..0d7a4c419c 100644
--- a/Libraries/PeriphDrivers/Include/MAX32650/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32650/rtc.h
@@ -103,6 +103,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec set the RTC Sec counter (32-bit)
  * @param     ssec set the RTC Sub-second counter (8-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX32655/rtc.h b/Libraries/PeriphDrivers/Include/MAX32655/rtc.h
index dd01462e4a..ec78158e08 100644
--- a/Libraries/PeriphDrivers/Include/MAX32655/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32655/rtc.h
@@ -105,6 +105,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_ERROR_CODES
diff --git a/Libraries/PeriphDrivers/Include/MAX32660/rtc.h b/Libraries/PeriphDrivers/Include/MAX32660/rtc.h
index 7d95e2d18b..b9e28d7a86 100644
--- a/Libraries/PeriphDrivers/Include/MAX32660/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32660/rtc.h
@@ -103,6 +103,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (8-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX32662/rtc.h b/Libraries/PeriphDrivers/Include/MAX32662/rtc.h
index 3a70f5493a..2b54cf1bc5 100644
--- a/Libraries/PeriphDrivers/Include/MAX32662/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32662/rtc.h
@@ -105,6 +105,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_ERROR_CODES
diff --git a/Libraries/PeriphDrivers/Include/MAX32665/rtc.h b/Libraries/PeriphDrivers/Include/MAX32665/rtc.h
index ca9c4f4b21..d6a709ce5e 100644
--- a/Libraries/PeriphDrivers/Include/MAX32665/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32665/rtc.h
@@ -104,6 +104,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX32670/rtc.h b/Libraries/PeriphDrivers/Include/MAX32670/rtc.h
index b0cd6e9261..856911d68b 100644
--- a/Libraries/PeriphDrivers/Include/MAX32670/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32670/rtc.h
@@ -105,6 +105,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX32672/rtc.h b/Libraries/PeriphDrivers/Include/MAX32672/rtc.h
index 6eb5d7c5f7..60ebb4ab63 100644
--- a/Libraries/PeriphDrivers/Include/MAX32672/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32672/rtc.h
@@ -105,6 +105,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX32680/rtc.h b/Libraries/PeriphDrivers/Include/MAX32680/rtc.h
index 41e1eff6c4..2300a0a3d6 100644
--- a/Libraries/PeriphDrivers/Include/MAX32680/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32680/rtc.h
@@ -105,6 +105,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX32690/rtc.h b/Libraries/PeriphDrivers/Include/MAX32690/rtc.h
index 7d136d19f2..b4c68ddcd2 100644
--- a/Libraries/PeriphDrivers/Include/MAX32690/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX32690/rtc.h
@@ -106,6 +106,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_Error_Codes
diff --git a/Libraries/PeriphDrivers/Include/MAX78000/rtc.h b/Libraries/PeriphDrivers/Include/MAX78000/rtc.h
index 700a9a10dd..9cf11c7500 100644
--- a/Libraries/PeriphDrivers/Include/MAX78000/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX78000/rtc.h
@@ -105,6 +105,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_ERROR_CODES
diff --git a/Libraries/PeriphDrivers/Include/MAX78002/rtc.h b/Libraries/PeriphDrivers/Include/MAX78002/rtc.h
index 7bf01dec3f..660ff137b0 100644
--- a/Libraries/PeriphDrivers/Include/MAX78002/rtc.h
+++ b/Libraries/PeriphDrivers/Include/MAX78002/rtc.h
@@ -105,6 +105,8 @@ int MXC_RTC_Stop(void);
 
 /**
  * @brief     Initialize the sec and ssec registers and enable RTC (Blocking function)
+ * @note      If you wish to manage clock configuration externally, define the flag
+ *            MSDK_NO_GPIO_CLK_INIT.
  * @param     sec    set the RTC Sec counter (32-bit)
  * @param     ssec   set the RTC Sub-second counter (12-bit)
  * @retval    returns Success or Fail, see \ref MXC_ERROR_CODES
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_ai87.c b/Libraries/PeriphDrivers/Source/RTC/rtc_ai87.c
index 84ce1ccbdd..fd0c5b1425 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_ai87.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_ai87.c
@@ -64,7 +64,9 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     MXC_GCR->clkctrl |= MXC_F_GCR_CLKCTRL_ERTCO_EN;
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me10.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me10.c
index 442bb1658f..a29d5fc72d 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me10.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me10.c
@@ -52,8 +52,10 @@ int MXC_RTC_Stop(void)
 // *****************************************************************************
 int MXC_RTC_Init(uint32_t sec, uint8_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     MXC_SYS_RTCClockEnable();
     MXC_SYS_Reset_Periph(MXC_SYS_RESET_RTC);
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me11.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me11.c
index 5afa51c00c..bf71d2dc55 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me11.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me11.c
@@ -62,8 +62,10 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint8_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     // Enable clock
     MXC_GCR->clk_ctrl |= MXC_F_GCR_CLK_CTRL_X32K_EN;
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_RTSS));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me12.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me12.c
index eb0845d383..a6da5b9842 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me12.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me12.c
@@ -64,8 +64,10 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     MXC_MCR->clkctrl &= ~MXC_F_MCR_CLKCTRL_ERTCO_PD;
     MXC_MCR->clkctrl |= MXC_F_MCR_CLKCTRL_ERTCO_EN;
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me13.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me13.c
index 851c5a7a4d..0bfc81780d 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me13.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me13.c
@@ -62,8 +62,10 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     // Enable clock
     MXC_GCR->clkctrl |= MXC_F_GCR_CLKCTRL_ERTCO_EN;
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me14.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me14.c
index 9397dfc1c2..af7597ece2 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me14.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me14.c
@@ -63,8 +63,10 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     // Enable clock
     MXC_GCR->clkcn |= MXC_F_GCR_CLKCN_X32K_EN;
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me15.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me15.c
index 4d1f3113f4..de6c4ace3a 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me15.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me15.c
@@ -63,8 +63,10 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     // Enable clock
     MXC_SYS_RTCClockEnable();
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me16.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me16.c
index 5e3f6528c2..2529ec35a3 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me16.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me16.c
@@ -62,8 +62,10 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint8_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     // Enable clock
     MXC_GCR->clkctrl |= MXC_F_GCR_CLKCTRL_ERTCO_EN;
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init(MXC_RTC, sec, ssec);
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me17.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me17.c
index 0505dfb76f..9c0fcce19a 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me17.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me17.c
@@ -79,7 +79,9 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     MXC_GCR->clkctrl |= MXC_F_GCR_CLKCTRL_ERTCO_EN;
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me18.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me18.c
index ff6ae0dc02..a7fba33c1e 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me18.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me18.c
@@ -64,7 +64,9 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     MXC_GCR->clkctrl |= MXC_F_GCR_CLKCTRL_ERTCO_EN;
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me21.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me21.c
index ff7c9215e2..8e5697ffd1 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me21.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me21.c
@@ -62,8 +62,10 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     // Enable clock
     MXC_SYS_ClockSourceEnable(MXC_SYS_CLOCK_ERTCO);
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/PeriphDrivers/Source/RTC/rtc_me55.c b/Libraries/PeriphDrivers/Source/RTC/rtc_me55.c
index bb1af0110a..9551ebed58 100644
--- a/Libraries/PeriphDrivers/Source/RTC/rtc_me55.c
+++ b/Libraries/PeriphDrivers/Source/RTC/rtc_me55.c
@@ -63,8 +63,10 @@ int MXC_RTC_Stop(void)
 
 int MXC_RTC_Init(uint32_t sec, uint16_t ssec)
 {
+#ifndef MSDK_NO_GPIO_CLK_INIT
     MXC_MCR->ctrl |= MXC_F_MCR_CLKCTRL_ERTCO_EN;
     MXC_MCR->clkctrl &= ~(MXC_F_MCR_CLKCTRL_ERTCO_PD);
+#endif /* MSDK_NO_GPIO_CLK_INIT */
 
     return MXC_RTC_RevA_Init((mxc_rtc_reva_regs_t *)MXC_RTC, sec, (ssec & MXC_F_RTC_SSEC_SSEC));
 }
diff --git a/Libraries/zephyr/MAX/Include/wrap_max32_sys.h b/Libraries/zephyr/MAX/Include/wrap_max32_sys.h
index 59b9df1f52..131ed04177 100644
--- a/Libraries/zephyr/MAX/Include/wrap_max32_sys.h
+++ b/Libraries/zephyr/MAX/Include/wrap_max32_sys.h
@@ -120,6 +120,9 @@ static inline mxc_sys_32k_clock_t wrap_get_32k_clock_source_instance(uint8_t clo
     mxc_sys_32k_clock_t clk_src;
 
     switch (clock_source) {
+    case 1: // ADI_MAX32_PRPH_CLK_SRC_EXTCLK
+        clk_src = MXC_SYS_32K_CLOCK_RTC_IN;
+        break;
     case 4: // ADI_MAX32_PRPH_CLK_SRC_ERTCO
         clk_src = MXC_SYS_32K_CLOCK_ERTCO;
         break;