diff --git a/arch/arm/src/efm32/efm32_spi.h b/arch/arm/src/efm32/efm32_spi.h
index 1108eec2ac..9e84fb68dc 100644
--- a/arch/arm/src/efm32/efm32_spi.h
+++ b/arch/arm/src/efm32/efm32_spi.h
@@ -52,7 +52,6 @@
  ****************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
 
 /****************************************************************************
  * Name: efm32_spibus_initialize
diff --git a/arch/arm/src/imx1/imx_cspi.h b/arch/arm/src/imx1/imx_cspi.h
index af36d194ba..f15872c49b 100644
--- a/arch/arm/src/imx1/imx_cspi.h
+++ b/arch/arm/src/imx1/imx_cspi.h
@@ -178,7 +178,6 @@ extern "C"
  ************************************************************************************/
 
 struct spi_dev_s; /* Forward reference */
-uint32_t;   /* Forward reference */
 
 /****************************************************************************
  * Name: imx_spibus_initialize
diff --git a/arch/arm/src/imx6/imx_ecspi.h b/arch/arm/src/imx6/imx_ecspi.h
index 8807c23145..ac30d2291f 100644
--- a/arch/arm/src/imx6/imx_ecspi.h
+++ b/arch/arm/src/imx6/imx_ecspi.h
@@ -70,7 +70,6 @@ extern "C"
  ************************************************************************************/
 
 struct spi_dev_s; /* Forward reference */
-uint32_t;   /* Forward reference */
 
 /************************************************************************************
  * Name: imx_spibus_initialize
diff --git a/arch/arm/src/kl/kl_spi.h b/arch/arm/src/kl/kl_spi.h
index d2f4824b73..fd621858a6 100644
--- a/arch/arm/src/kl/kl_spi.h
+++ b/arch/arm/src/kl/kl_spi.h
@@ -64,7 +64,6 @@ extern "C"
  ************************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
 
 /****************************************************************************
  * Name: kl_spibus_initialize
diff --git a/arch/arm/src/lpc17xx/lpc17_spi.h b/arch/arm/src/lpc17xx/lpc17_spi.h
index 1934eb582f..27d9ba8bb9 100644
--- a/arch/arm/src/lpc17xx/lpc17_spi.h
+++ b/arch/arm/src/lpc17xx/lpc17_spi.h
@@ -71,7 +71,6 @@ extern "C"
  ************************************************************************************/
 
 struct spi_dev_s; /* Forward reference */
-uint32_t;   /* Forward reference */
 
 /************************************************************************************
  * Name: lpc17_spibus_initialize
diff --git a/arch/arm/src/lpc2378/lpc23xx_spi.h b/arch/arm/src/lpc2378/lpc23xx_spi.h
index 08ffcfbbbf..8b5fbda37c 100644
--- a/arch/arm/src/lpc2378/lpc23xx_spi.h
+++ b/arch/arm/src/lpc2378/lpc23xx_spi.h
@@ -154,7 +154,6 @@
  ************************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
 
 /****************************************************************************
  * Name: lpc23_spibus_initialize
diff --git a/arch/arm/src/lpc31xx/lpc31.h b/arch/arm/src/lpc31xx/lpc31.h
index de9294928a..00ce6b8e35 100644
--- a/arch/arm/src/lpc31xx/lpc31.h
+++ b/arch/arm/src/lpc31xx/lpc31.h
@@ -185,8 +185,6 @@ void lpc31_clockconfig(void);
  ************************************************************************************/
 
 struct spi_dev_s; /* Forward reference */
-uint32_t;   /* Forward reference */
-
 FAR struct spi_dev_s *lpc31_spibus_initialize(int port);
 
 /************************************************************************************
diff --git a/arch/arm/src/sam34/sam_spi.h b/arch/arm/src/sam34/sam_spi.h
index f3bebd11f1..8cebb2f121 100644
--- a/arch/arm/src/sam34/sam_spi.h
+++ b/arch/arm/src/sam34/sam_spi.h
@@ -110,7 +110,6 @@ extern "C"
  ****************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
 
 /****************************************************************************
  * Name: sam_spibus_initialize
diff --git a/arch/arm/src/sama5/sam_spi.h b/arch/arm/src/sama5/sam_spi.h
index ad73fdf78b..705f2248e7 100644
--- a/arch/arm/src/sama5/sam_spi.h
+++ b/arch/arm/src/sama5/sam_spi.h
@@ -104,7 +104,6 @@ extern "C"
  ****************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
 
 /****************************************************************************
  * Name: sam_spibus_initialize
diff --git a/arch/arm/src/samdl/sam_spi.h b/arch/arm/src/samdl/sam_spi.h
index 4bfff626a2..7e0cbfa9e0 100644
--- a/arch/arm/src/samdl/sam_spi.h
+++ b/arch/arm/src/samdl/sam_spi.h
@@ -87,7 +87,6 @@ extern "C"
  ****************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
 
 /****************************************************************************
  * Name: sam_spibus_initialize
diff --git a/arch/arm/src/samv7/sam_spi.h b/arch/arm/src/samv7/sam_spi.h
index fc24b289f1..762f34f67d 100644
--- a/arch/arm/src/samv7/sam_spi.h
+++ b/arch/arm/src/samv7/sam_spi.h
@@ -158,7 +158,6 @@ extern "C"
  ****************************************************************************/
 
 struct spi_dev_s;    /* Forward reference */
-uint32_t;      /* Forward reference */
 struct spi_sctrlr_s; /* Forward reference */
 
 /****************************************************************************
diff --git a/arch/arm/src/tiva/tiva_ssi.h b/arch/arm/src/tiva/tiva_ssi.h
index 54d2004702..d0976c2aee 100644
--- a/arch/arm/src/tiva/tiva_ssi.h
+++ b/arch/arm/src/tiva/tiva_ssi.h
@@ -108,7 +108,6 @@ FAR struct spi_dev_s *tiva_ssibus_initialize(int port);
  ****************************************************************************/
 
 struct spi_dev_s;
-uint32_t;
 void tiva_ssiselect(FAR struct spi_dev_s *dev, uint32_t devid, bool selected);
 uint8_t tiva_ssistatus(FAR struct spi_dev_s *dev, uint32_t devid);
 #ifdef CONFIG_SPI_CMDDATA
diff --git a/arch/avr/src/avr/avr.h b/arch/avr/src/avr/avr.h
index a06de4c024..431c925067 100644
--- a/arch/avr/src/avr/avr.h
+++ b/arch/avr/src/avr/avr.h
@@ -151,8 +151,6 @@ uint8_t *up_doirq(uint8_t irq, uint8_t *regs);
  ****************************************************************************/
 
 struct spi_dev_s; /* Forward references */
-uint32_t;   /* Forward references */
-
 FAR struct spi_dev_s *avr_spibus_initialize(int port);
 
 /************************************************************************************
diff --git a/arch/hc/src/m9s12/m9s12.h b/arch/hc/src/m9s12/m9s12.h
index 921c4efa96..53da6a7726 100644
--- a/arch/hc/src/m9s12/m9s12.h
+++ b/arch/hc/src/m9s12/m9s12.h
@@ -338,8 +338,6 @@ int hcs12_ethinitialize(int intf);
  ****************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
-
 FAR struct spi_dev_s *hcs12_spibus_initialize(int port);
 
 /************************************************************************************
diff --git a/arch/mips/src/pic32mx/pic32mx.h b/arch/mips/src/pic32mx/pic32mx.h
index cd2272597a..480ff80fb8 100644
--- a/arch/mips/src/pic32mx/pic32mx.h
+++ b/arch/mips/src/pic32mx/pic32mx.h
@@ -400,8 +400,6 @@ void pic32mx_dumpgpio(uint32_t pinset, const char *msg);
  ****************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
-
 FAR struct spi_dev_s *pic32mx_spibus_initialize(int port);
 
 /************************************************************************************
diff --git a/arch/mips/src/pic32mz/pic32mz-spi.h b/arch/mips/src/pic32mz/pic32mz-spi.h
index 1cbc8e4be3..ce4d772e0a 100644
--- a/arch/mips/src/pic32mz/pic32mz-spi.h
+++ b/arch/mips/src/pic32mz/pic32mz-spi.h
@@ -71,7 +71,6 @@ extern "C"
  ************************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
 
 /****************************************************************************
  * Name: pic32mz_spibus_initialize
diff --git a/arch/x86/src/qemu/qemu.h b/arch/x86/src/qemu/qemu.h
index 6eada26a05..3a073376dc 100644
--- a/arch/x86/src/qemu/qemu.h
+++ b/arch/x86/src/qemu/qemu.h
@@ -208,8 +208,6 @@ int i486_dumpgpio(uint16_t pinset, const char *msg);
  ****************************************************************************/
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
-
 FAR struct spi_dev_s *i486_spibus_initialize(int port);
 
 /************************************************************************************
@@ -242,7 +240,6 @@ FAR struct spi_dev_s *i486_spibus_initialize(int port);
  ************************************************************************************/
 
 struct spi_dev_s;
-uint32_t;
 
 #ifdef CONFIG_I486_SPI
 void  i486_spiselect(FAR struct spi_dev_s *dev, uint32_t devid, bool selected);
diff --git a/arch/z16/src/z16f/chip.h b/arch/z16/src/z16f/chip.h
index f54a188a22..b395c6e3b5 100644
--- a/arch/z16/src/z16f/chip.h
+++ b/arch/z16/src/z16f/chip.h
@@ -677,7 +677,6 @@ void z16f_reset(void);
 #ifdef CONFIG_Z16F_ESPI
 
 struct spi_dev_s;  /* Forward reference */
-uint32_t;    /* Forward reference */
 
 /* Initialize the selected SPI port */
 
diff --git a/configs/mirtoo/src/pic32_spi2.c b/configs/mirtoo/src/pic32_spi2.c
index 6773995cdb..df7fbd3fe6 100644
--- a/configs/mirtoo/src/pic32_spi2.c
+++ b/configs/mirtoo/src/pic32_spi2.c
@@ -154,7 +154,6 @@ void weak_function pic32mx_spi2initialize(void)
  ************************************************************************************/
 
 struct spi_dev_s;
-uint32_t;
 
 void  pic32mx_spi2select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
 {
diff --git a/configs/pic32mx-starterkit/src/pic32mx_spi.c b/configs/pic32mx-starterkit/src/pic32mx_spi.c
index 342b6797f5..9f8d2262ba 100644
--- a/configs/pic32mx-starterkit/src/pic32mx_spi.c
+++ b/configs/pic32mx-starterkit/src/pic32mx_spi.c
@@ -102,7 +102,6 @@ void weak_function pic32mx_spidev_initialize(void)
  ************************************************************************************/
 
 struct spi_dev_s;
-uint32_t;
 
 #ifdef CONFIG_PIC32MX_SPI1
 void  pic32mx_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
diff --git a/configs/pic32mx7mmb/src/pic32_spi.c b/configs/pic32mx7mmb/src/pic32_spi.c
index 5af04e598c..f1d65cb8ed 100644
--- a/configs/pic32mx7mmb/src/pic32_spi.c
+++ b/configs/pic32mx7mmb/src/pic32_spi.c
@@ -128,7 +128,6 @@ void weak_function pic32mx_spidev_initialize(void)
  ************************************************************************************/
 
 struct spi_dev_s;
-uint32_t;
 
 #ifdef CONFIG_PIC32MX_SPI1
 void  pic32mx_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
diff --git a/configs/pic32mz-starterkit/src/pic32mz_spi.c b/configs/pic32mz-starterkit/src/pic32mz_spi.c
index d3c7341cdc..1de5d9ac9d 100644
--- a/configs/pic32mz-starterkit/src/pic32mz_spi.c
+++ b/configs/pic32mz-starterkit/src/pic32mz_spi.c
@@ -100,7 +100,6 @@ void weak_function pic32mz_spidev_initialize(void)
  ************************************************************************************/
 
 struct spi_dev_s;
-uint32_t;
 
 #ifdef CONFIG_PIC32MZ_SPI1
 void  pic32mz_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)