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SBI PMU extension requires a firmware to be aware of the event to counter/mhpmevent mappings supported by the hardware. One approach is to encode that information in the device tree. Define a device tree binding that allows a hardware to describe all the PMU mappings required in concise format. Reviewed-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Atish Patra <atish.patra@wdc.com>