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Some of the Broadcom iProc SoCs have FlexRM ring manager which provides a ring-based programming interface to various offload engines (e.g. RAID, Crypto, etc). This patch adds a common mailbox driver for Broadcom FlexRM ring manager which can be shared by various offload engine drivers (implemented as mailbox clients). Reviewed-by: Ray Jui <[email protected]> Reviewed-by: Scott Branden <[email protected]> Reviewed-by: Pramod KUMAR <[email protected]> Signed-off-by: Anup Patel <[email protected]> Signed-off-by: Jassi Brar <[email protected]>