diff --git a/arch/arm/soc/nxp_kinetis/kl2x/Kconfig.defconfig.mkl25z4 b/arch/arm/soc/nxp_kinetis/kl2x/Kconfig.defconfig.mkl25z4
index 22b9a69e274..c74f64ff910 100644
--- a/arch/arm/soc/nxp_kinetis/kl2x/Kconfig.defconfig.mkl25z4
+++ b/arch/arm/soc/nxp_kinetis/kl2x/Kconfig.defconfig.mkl25z4
@@ -31,7 +31,7 @@ endif # GPIO
 
 if SERIAL
 
-config UART_MCUX
+config UART_MCUX_LPSCI
 	def_bool y
 
 endif # SERIAL
diff --git a/arch/arm/soc/nxp_kinetis/kl2x/Kconfig.soc b/arch/arm/soc/nxp_kinetis/kl2x/Kconfig.soc
index cedbb27f66a..8081d971918 100644
--- a/arch/arm/soc/nxp_kinetis/kl2x/Kconfig.soc
+++ b/arch/arm/soc/nxp_kinetis/kl2x/Kconfig.soc
@@ -15,6 +15,7 @@ config SOC_MKL25Z4
 	select HAS_MCUX
 	select HAS_OSC
 	select HAS_MCG
+	select HAS_LPSCI
 
 endchoice
 
diff --git a/arch/arm/soc/nxp_kinetis/kl2x/soc.c b/arch/arm/soc/nxp_kinetis/kl2x/soc.c
index d3777850176..11a15c78896 100644
--- a/arch/arm/soc/nxp_kinetis/kl2x/soc.c
+++ b/arch/arm/soc/nxp_kinetis/kl2x/soc.c
@@ -13,6 +13,8 @@
 #include <fsl_clock.h>
 #include <arch/cpu.h>
 
+#define LPSCI0SRC_MCGFLLCLK	(1)
+
 /*******************************************************************************
  * Variables
  ******************************************************************************/
@@ -93,8 +95,8 @@ static ALWAYS_INLINE void clkInit(void)
 	CLOCK_SetInternalRefClkConfig(kMCG_IrclkEnable, kMCG_IrcSlow, 0);
 	CLOCK_SetSimConfig(&simConfig);
 
-#ifdef CONFIG_UART_MCUX_0
-	CLOCK_SetLpsci0Clock(1);
+#ifdef CONFIG_UART_MCUX_LPSCI_0
+	CLOCK_SetLpsci0Clock(LPSCI0SRC_MCGFLLCLK);
 #endif
 }