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| author | Linus Walleij <linus.walleij@linaro.org> | 2016-01-26 14:00:13 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-04-04 11:33:16 +0300 |
| commit | 81fc3eb2b3c253b9aa5f55b6af5246a6c431dbf4 (patch) | |
| tree | b31c3c0704a301994f42e9f6b5a2d0b6217d144d /Documentation/devicetree/bindings/mtd | |
| parent | b0afd44bc192ff4c0e90a5fc1724350bcfc32b33 (diff) | |
| download | linux-81fc3eb2b3c253b9aa5f55b6af5246a6c431dbf4.tar.xz | |
mtd: augment the "arm,versatile-flash" bindings
The bindings for the "arm,versatile-flash" device was merged in
commit 3ba7222ac992d24d09ccd0b55940b54849eef752
"arm/versatile: Add device tree support" but was never used
for anything.
Versatile flash chips are actually just standard CFI chips,
but they have one or two bits in a system controller to control
VPP and write protection. Let's use this compatible string in
conjunction with "cfi-flash" to indicate that we have a
normal CFI flash with some extra Versatile-specific protection.
Cc: devicetree@vger.kernel.org
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/mtd')
| -rw-r--r-- | Documentation/devicetree/bindings/mtd/arm-versatile.txt | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/mtd/arm-versatile.txt b/Documentation/devicetree/bindings/mtd/arm-versatile.txt index beace4b89daa..4ec28796a3c0 100644 --- a/Documentation/devicetree/bindings/mtd/arm-versatile.txt +++ b/Documentation/devicetree/bindings/mtd/arm-versatile.txt @@ -1,8 +1,26 @@ Flash device on ARM Versatile board +These flash chips are found in the ARM reference designs like Integrator, +Versatile, RealView, Versatile Express etc. + +They are regular CFI compatible (Intel or AMD extended) flash chips with +some special write protect/VPP bits that can be controlled by the machine's +system controller. + Required properties: -- compatible : must be "arm,versatile-flash"; +- compatible : must be "arm,versatile-flash", "cfi-flash"; +- reg : memory address for the flash chip - bank-width : width in bytes of flash interface. +For the rest of the properties, see mtd-physmap.txt. + The device tree may optionally contain sub-nodes describing partitions of the address space. See partition.txt for more detail. + +Example: + +flash@34000000 { + compatible = "arm,versatile-flash", "cfi-flash"; + reg = <0x34000000 0x4000000>; + bank-width = <4>; +}; |