ux500: modem_irq is only for 5500

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
[Modified to hit the right file]
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>

arch/arm/mach-ux500/modem-irq-db5500.c

@@ -12,6 +12,8 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 
+#include <mach/id.h>
+
 #define MODEM_INTCON_BASE_ADDR 0xBFFD3000
 #define MODEM_INTCON_SIZE 0xFFF
 
@@ -101,6 +103,9 @@ static int modem_irq_init(void)
 	static struct irq_chip  modem_irq_chip;
 	struct modem_irq *mi;
 
+	if (!cpu_is_u5500())
+		return -ENODEV;
+
 	pr_info("modem_irq: Set up IRQ handler for incoming modem IRQ %d\n",
 		   IRQ_DB5500_MODEM);