diff --git a/arch/arm/mach-s3c64xx/dma.c b/arch/arm/mach-s3c64xx/dma.c
index 33ccf7bf766a..5567e037b0d1 100644
--- a/arch/arm/mach-s3c64xx/dma.c
+++ b/arch/arm/mach-s3c64xx/dma.c
@@ -414,7 +414,7 @@ int s3c2410_dma_enqueue(unsigned int channel, void *id,
 EXPORT_SYMBOL(s3c2410_dma_enqueue);
 
 
-int s3c2410_dma_devconfig(int channel,
+int s3c2410_dma_devconfig(unsigned int channel,
 			  enum s3c2410_dmasrc source,
 			  unsigned long devaddr)
 {
diff --git a/arch/arm/plat-s3c24xx/dma.c b/arch/arm/plat-s3c24xx/dma.c
index 93827b3d4e84..6ad274e7593d 100644
--- a/arch/arm/plat-s3c24xx/dma.c
+++ b/arch/arm/plat-s3c24xx/dma.c
@@ -1104,7 +1104,7 @@ EXPORT_SYMBOL(s3c2410_dma_config);
  * devaddr:   physical address of the source
 */
 
-int s3c2410_dma_devconfig(int channel,
+int s3c2410_dma_devconfig(unsigned int channel,
 			  enum s3c2410_dmasrc source,
 			  unsigned long devaddr)
 {
diff --git a/arch/arm/plat-samsung/include/plat/dma.h b/arch/arm/plat-samsung/include/plat/dma.h
index 7584d751ed51..2e8f8c6560d7 100644
--- a/arch/arm/plat-samsung/include/plat/dma.h
+++ b/arch/arm/plat-samsung/include/plat/dma.h
@@ -110,8 +110,8 @@ extern int s3c2410_dma_config(unsigned int channel, int xferunit);
  * configure the device we're talking to
 */
 
-extern int s3c2410_dma_devconfig(int channel, enum s3c2410_dmasrc source,
-				 unsigned long devaddr);
+extern int s3c2410_dma_devconfig(unsigned int channel,
+		enum s3c2410_dmasrc source, unsigned long devaddr);
 
 /* s3c2410_dma_getposition
  *