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mtd: physmap_of: add a hook for Gemini flash probing

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In order to support device tree probing of Gemini NOR flash
chips, a certain register in the syscon needs to be poked
to enable parallel flash mode.

Such things used to happen in "necessarily different" board
file code, and this indeed was also done for the Gemini, so
the MTD driver could treat it as any memory-mapped NOR flash,
but this is not the way in the future: board files need to
go, and hardware concerns distributed down to the applicable
drivers.

This adds a hook in the same way that the Versatile did: if
the Kconfig symbol is not selected the net total of supporting
Gemini should be zero bytes of added code. To live up to this
promise, also the return value error print from the Versatile
extra probe call get to be removed in this patch, all printing
need to happen in the add-ons.

Cc: Janos Laube <janos.dev@gmail.com>
Cc: Paulius Zaleckas <paulius.zaleckas@gmail.com>
Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Linus Walleij
2017-01-28 22:50:48 +01:00
committed by Brian Norris
parent 40bc941d65
commit 56ff337ea4
5 changed files with 154 additions and 8 deletions
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12
drivers/mtd/maps/Kconfig
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@@ -75,7 +75,7 @@ config MTD_PHYSMAP_OF
taken from OF device tree.
config MTD_PHYSMAP_OF_VERSATILE
bool "Support ARM Versatile physmap OF"
bool "ARM Versatile OF-based physical memory map handling"
depends on MTD_PHYSMAP_OF
depends on MFD_SYSCON
default y if (ARCH_INTEGRATOR || ARCH_VERSATILE || ARCH_REALVIEW)
@@ -84,6 +84,16 @@ config MTD_PHYSMAP_OF_VERSATILE
platforms, basically to add a VPP (write protection) callback so
the flash can be taken out of write protection.
config MTD_PHYSMAP_OF_GEMINI
bool "Cortina Gemini OF-based physical memory map handling"
depends on MTD_PHYSMAP_OF
depends on MFD_SYSCON
default ARCH_GEMINI
help
This provides some extra DT physmap parsing for the Gemini
platforms, some detection and setting up parallel mode on the
external interface.
config MTD_PMC_MSP_EVM
tristate "CFI Flash device mapped on PMC-Sierra MSP"
depends on PMC_MSP && MTD_CFI