From 399b4ba69dff1620aa0223fcb0482e19f1f9eb18 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Fri, 4 May 2018 17:40:33 -0600
Subject: [PATCH] arch/arm/src/kinetis:  Eliminate a warning when no UARTs are
 enabled.

---
 arch/arm/src/kinetis/Kconfig              |  1 +
 arch/arm/src/kinetis/Make.defs            | 24 ++++++++++++-----------
 arch/arm/src/kinetis/kinetis_serialinit.c |  3 +--
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/arch/arm/src/kinetis/Kconfig b/arch/arm/src/kinetis/Kconfig
index 80647f40e84..3f79442d78f 100644
--- a/arch/arm/src/kinetis/Kconfig
+++ b/arch/arm/src/kinetis/Kconfig
@@ -266,6 +266,7 @@ config KINETIS_SERIALDRIVER
 config KINETIS_LPUART
 	bool
 	default n
+	select MCU_SERIAL
 
 config KINETIS_UART
 	bool
diff --git a/arch/arm/src/kinetis/Make.defs b/arch/arm/src/kinetis/Make.defs
index 7e47c09e035..00b552e36c6 100644
--- a/arch/arm/src/kinetis/Make.defs
+++ b/arch/arm/src/kinetis/Make.defs
@@ -1,7 +1,7 @@
 ############################################################################
 # arch/arm/src/kinetis/Make.defs
 #
-#   Copyright (C) 2011, 2013-2017 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2011, 2013-2018 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -110,12 +110,10 @@ endif
 
 CHIP_ASRCS  =
 
-CHIP_CSRCS  = kinetis_allocateheap.c kinetis_clockconfig.c
-CHIP_CSRCS += kinetis_clrpend.c kinetis_idle.c kinetis_irq.c
-CHIP_CSRCS += kinetis_lowputc.c kinetis_pin.c kinetis_pingpio.c
-CHIP_CSRCS += kinetis_serialinit.c kinetis_serial.c
-CHIP_CSRCS += kinetis_start.c kinetis_uid.c kinetis_wdog.c
-CHIP_CSRCS += kinetis_cfmconfig.c
+CHIP_CSRCS  = kinetis_allocateheap.c kinetis_clockconfig.c kinetis_clrpend.c
+CHIP_CSRCS += kinetis_idle.c kinetis_irq.c kinetis_lowputc.c kinetis_pin.c
+CHIP_CSRCS += kinetis_pingpio.c kinetis_serialinit.c kinetis_start.c
+CHIP_CSRCS += kinetis_uid.c kinetis_wdog.c kinetis_cfmconfig.c
 CHIP_CSRCS += kinetis_mpuinit.c
 
 # Configuration-dependent Kinetis files
@@ -136,6 +134,14 @@ ifeq ($(CONFIG_DEBUG_GPIO_INFO),y)
 CHIP_CSRCS += kinetis_pindump.c
 endif
 
+ifneq ($(CONFIG_KINETIS_UART),y)
+CHIP_CSRCS += kinetis_serial.c
+endif
+
+ifeq ($(CONFIG_KINETIS_LPUART),y)
+CHIP_CSRCS += kinetis_lpserial.c
+endif
+
 ifeq ($(CONFIG_KINETIS_SDHC),y)
 CHIP_CSRCS += kinetis_sdhc.c
 endif
@@ -168,10 +174,6 @@ ifeq ($(CONFIG_I2C),y)
 CHIP_CSRCS += kinetis_i2c.c
 endif
 
-ifeq ($(CONFIG_KINETIS_LPUART),y)
-CHIP_CSRCS += kinetis_lpserial.c
-endif
-
 ifeq ($(CONFIG_RTC),y)
 CHIP_CSRCS += kinetis_rtc.c
 ifeq ($(CONFIG_RTC_DRIVER),y)
diff --git a/arch/arm/src/kinetis/kinetis_serialinit.c b/arch/arm/src/kinetis/kinetis_serialinit.c
index ea4e1e240b9..90f5192212f 100644
--- a/arch/arm/src/kinetis/kinetis_serialinit.c
+++ b/arch/arm/src/kinetis/kinetis_serialinit.c
@@ -86,8 +86,6 @@ void kinetis_earlyserialinit(void)
 }
 #endif
 
-#if defined(USE_SERIALDRIVER)
-
 /****************************************************************************
  * Name: up_serialinit
  *
@@ -97,6 +95,7 @@ void kinetis_earlyserialinit(void)
  *
  ****************************************************************************/
 
+#if defined(USE_SERIALDRIVER)
 void up_serialinit(void)
 {
 #if defined(HAVE_UART_DEVICE) ||defined(HAVE_LPUART_DEVICE)