ARM: 6063/1: pmu: add enum describing PMU types

This patch adds an enum describing the potential PMU device types in
preparation for PMU device registration via platform devices.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/pmu.h

@@ -12,6 +12,11 @@
 #ifndef __ARM_PMU_H__
 #define __ARM_PMU_H__
 
+enum arm_pmu_type {
+	ARM_PMU_DEVICE_CPU	= 0,
+	ARM_NUM_PMU_DEVICES,
+};
+
 #ifdef CONFIG_CPU_HAS_PMU
 
 struct pmu_irqs {