MFC r277958, r278061:

ti_pruss: make sure the mmap'ed memory region is uncacheable.

am335x_clk_pruss_activate(): use the L3F clock.

MFC r275376:

Allow multiple devices to mmap. It's impossible to prevent this with
checks on the open/close functions.

MFC r261410

Follow r261352 by updating all drivers which are children of simplebus
to check the status property in their probe routines.

MFC r258209, r258210, r261211,

Add a driver for the Texas Instruments Mailbox hardware.

Add a driver for the TI Programmable Realtime Unit Subsystem.

fix args to mtx_init

MFC r277958, r278061:

ti_pruss: make sure the mmap'ed memory region is uncacheable.

am335x_clk_pruss_activate(): use the L3F clock.

MFC r275376:

Allow multiple devices to mmap. It's impossible to prevent this with
checks on the open/close functions.

MFC r261410

Follow r261352 by updating all drivers which are children of simplebus
to check the status property in their probe routines.

MFC r258209, r258210, r261211,

Add a driver for the Texas Instruments Mailbox hardware.

Add a driver for the TI Programmable Realtime Unit Subsystem.

fix args to mtx_init