Fix misspellings of "system", "controller", "interrupt" and "necessary".

Fix the various misspellings of "system", controller", "interrupt" and
"[un]necessary".

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index ba4a1bb..aa2d365 100644
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c
@@ -439,7 +439,7 @@
 		for (i = 0; i < 32; i++, pin++) {
 			/*
 			 * Can use the "simple" and not "edge" handler since it's
-			 * shorter, and the AIC handles interupts sanely.
+			 * shorter, and the AIC handles interrupts sanely.
 			 */
 			set_irq_chip(pin, &gpio_irqchip);
 			set_irq_handler(pin, handle_simple_irq);
diff --git a/arch/arm/mach-s3c2410/clock.c b/arch/arm/mach-s3c2410/clock.c
index cab9d62..2bfaa61 100644
--- a/arch/arm/mach-s3c2410/clock.c
+++ b/arch/arm/mach-s3c2410/clock.c
@@ -238,7 +238,7 @@
 	}
 
 	/* We must be careful disabling the clocks we are not intending to
-	 * be using at boot time, as subsytems such as the LCD which do
+	 * be using at boot time, as subsystems such as the LCD which do
 	 * their own DMA requests to the bus can cause the system to lockup
 	 * if they where in the middle of requesting bus access.
 	 *
diff --git a/arch/arm/mach-s3c2412/clock.c b/arch/arm/mach-s3c2412/clock.c
index 8543dd6..4589936 100644
--- a/arch/arm/mach-s3c2412/clock.c
+++ b/arch/arm/mach-s3c2412/clock.c
@@ -689,7 +689,7 @@
 	}
 
 	/* We must be careful disabling the clocks we are not intending to
-	 * be using at boot time, as subsytems such as the LCD which do
+	 * be using at boot time, as subsystems such as the LCD which do
 	 * their own DMA requests to the bus can cause the system to lockup
 	 * if they where in the middle of requesting bus access.
 	 *
diff --git a/arch/arm/mach-s3c2443/clock.c b/arch/arm/mach-s3c2443/clock.c
index 5840294..b42f956 100644
--- a/arch/arm/mach-s3c2443/clock.c
+++ b/arch/arm/mach-s3c2443/clock.c
@@ -1005,7 +1005,7 @@
 	}
 
 	/* We must be careful disabling the clocks we are not intending to
-	 * be using at boot time, as subsytems such as the LCD which do
+	 * be using at boot time, as subsystems such as the LCD which do
 	 * their own DMA requests to the bus can cause the system to lockup
 	 * if they where in the middle of requesting bus access.
 	 *