Powerpc powernv platforms allow access to certain system flash devices
through a firmwarwe interface. This change adds an mtd driver for these
flash devices.

Minor updates from Jeremy Kerr and Joel Stanley.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

---
Hello Brian and MTD folk,
Could I please get an ACK for Michael to take this through the powerpc
tree.
Thanks.


V2: Address Brian Norris' review
    Fix typos
    Change from NAND flash type to NOR flash type
    Correctness tweaks
V3: Address Neelesh Gupta's review
    Minor corrections
    Release the opal token on error
    Unregister mtd device on module remove
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 drivers/mtd/devices/Kconfig         |   8 +
 drivers/mtd/devices/Makefile        |   1 +
 drivers/mtd/devices/powernv_flash.c | 286 ++++++++++++++++++++++++++++++++++++
 3 files changed, 295 insertions(+)
 create mode 100644 drivers/mtd/devices/powernv_flash.c