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diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
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+menuconfig MAILBOX
+ bool "Mailbox Hardware Support"
+ help
+ Mailbox is a framework to control hardware communication between
+ on-chip processors through queued messages and interrupt driven
+ signals. Say Y if your platform supports hardware mailboxes.
+
+if MAILBOX
+config PL320_MBOX
+ bool "ARM PL320 Mailbox"
+ depends on ARM_AMBA
+ help
+ An implementation of the ARM PL320 Interprocessor Communication
+ Mailbox (IPCM), tailored for the Calxeda Highbank. It is used to
+ send short messages between Highbank's A9 cores and the EnergyCore
+ Management Engine, primarily for cpufreq. Say Y here if you want
+ to use the PL320 IPCM support.
+
+endif

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