mailbox: sprd: Add Spreadtrum mailbox driver
The Spreadtrum mailbox controller supports 8 channels to communicate with MCUs, and it contains 2 different parts: inbox and outbox, which are used to send and receive messages by IRQ mode. Signed-off-by: NBaolin Wang <baolin.wang@unisoc.com> Signed-off-by: NJassi Brar <jaswinder.singh@linaro.org>
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drivers/mailbox/sprd-mailbox.c
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