diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2016-01-26 13:58:07 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-04-04 11:33:16 +0300 |
| commit | b0afd44bc192ff4c0e90a5fc1724350bcfc32b33 (patch) | |
| tree | 1d0d2bdc42defee1c7f4345a6e3dca319d1e43ac /drivers/mtd/maps/Kconfig | |
| parent | 9735a22799b9214d17d3c231fe377fc852f042e9 (diff) | |
| download | linux-b0afd44bc192ff4c0e90a5fc1724350bcfc32b33.tar.xz | |
mtd: physmap_of: add a hook for Versatile write protection
In order to support device tree probing of Versatile NOR flash
chips, there must be a way to add the VPP (write protection)
enable/disable callback. The register in question is in the
system controllers of these machines. Apart from this quirk,
the ARM flash chips are standard CFI flash chips from various
vendors.
Additionally, the Integrator/AP require you to set up the external
bus interface (EBI) to allow writes to the chip select where the
flash memory is connected.
Solve this by looking for the arm,versatile-flash compatible
string in the flash device tree node. In the driver,
add a special hook to check for the various Versatile syscons and
register a callback for .set_vpp() if this compatible is present.
Provide a special Kconfig entry for the addon hook so it will
not be compiled in if the Versatile boards are not supported.
Stubs in the header file make sure the impact will be zero on
other platforms. (Compilers optimze this out.)
With this patch, a large slew of ARM board file code can be
removed.
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/mtd/maps/Kconfig')
| -rw-r--r-- | drivers/mtd/maps/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig index 7c95a656f9e4..392f9eff5fb7 100644 --- a/drivers/mtd/maps/Kconfig +++ b/drivers/mtd/maps/Kconfig @@ -74,6 +74,16 @@ config MTD_PHYSMAP_OF physically into the CPU's memory. The mapping description here is taken from OF device tree. +config MTD_PHYSMAP_OF_VERSATILE + bool "Support ARM Versatile physmap OF" + depends on MTD_PHYSMAP_OF + depends on MFD_SYSCON + default y if (ARCH_INTEGRATOR || ARCH_VERSATILE || REALVIEW_DT) + help + This provides some extra DT physmap parsing for the ARM Versatile + platforms, basically to add a VPP (write protection) callback so + the flash can be taken out of write protection. + config MTD_PMC_MSP_EVM tristate "CFI Flash device mapped on PMC-Sierra MSP" depends on PMC_MSP && MTD_CFI |