spelling: s/retreive/retrieve/

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 977ee3a..34ab0da 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -972,7 +972,7 @@
 #endif
 
 #ifdef CONFIG_PPC_RTAS
-	/* To help early debugging via the front panel, we retreive a minimal
+	/* To help early debugging via the front panel, we retrieve a minimal
 	 * set of RTAS infos now if available
 	 */
 	{
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 4283fa3..ae2e2a3 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -632,7 +632,7 @@
 }
 
 /*
- * Call early during boot, before mem init or bootmem, to retreive the RTAS
+ * Call early during boot, before mem init or bootmem, to retrieve the RTAS
  * informations from the device-tree and allocate the RMO buffer for userland
  * accesses.
  */
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 98e9f05..81567e9 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -438,7 +438,7 @@
 
 	/*
 	 * Fill the ppc64_caches & systemcfg structures with informations
-	 * retreived from the device-tree. Need to be called before
+	 * retrieved from the device-tree. Need to be called before
 	 * finish_device_tree() since the later requires some of the
 	 * informations filled up here to properly parse the interrupt
 	 * tree.