ARM: shmobile: irq_pin() for static IRQ pin assignment

Add the macro irq_pin() to let board-specific code using
platform devices tie in external IRQn pins in a common way.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/include/mach/irqs.h

@@ -12,4 +12,8 @@
 #define INTCS_VECT(n, vect)	INTC_VECT((n), INTCS_VECT_BASE + (vect))
 #define intcs_evt2irq(evt)	evt2irq(INTCS_VECT_BASE + (evt))
 
+/* External IRQ pins */
+#define IRQPIN_BASE		2000
+#define irq_pin(nr)		((nr) + IRQPIN_BASE)
+
 #endif /* __ASM_MACH_IRQS_H */