of_iomap() matched with plan iounmap()

[David Brown]

The SPARC target contains of_ioremap() and of_iounmap(), which various
drivers use (generally inside of CONFIG_SBUS).

include/linux/of_address.h contains a definition for of_iomap(), but
not corresponding unmap call.  Code using this calls the regular
iounmap().

Is it safe to assume that of_iomap() will always be based on ioremap()
and therefore it is safe to use iounmap(), or would it be better to
define another name for drivers to use as the inverse of of_iomap().
I'm not sure what to call it, since of_iounmap() is already taken by
SPARC.

Thanks,
David

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