From 81fc3eb2b3c253b9aa5f55b6af5246a6c431dbf4 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Tue, 26 Jan 2016 12:00:13 +0100 Subject: [PATCH] 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 Cc: Arnd Bergmann Cc: Mark Rutland Acked-by: Rob Herring Signed-off-by: Linus Walleij --- .../devicetree/bindings/mtd/arm-versatile.txt | 20 ++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) 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>; +};