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authorMarek Vasut <marex@denx.de>2012-09-24 03:39:39 +0200
committerArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2012-11-15 14:37:46 +0100
commit12ad2be9d1db3dcce08f29bdc5415db3af58fa60 (patch)
treefed5730ae8874534d8ccdcebaf05634f8f822f7c /Documentation
parentmtd: gpmi-nand: make debug prints more clear (diff)
downloadlinux-12ad2be9d1db3dcce08f29bdc5415db3af58fa60.tar.xz
linux-12ad2be9d1db3dcce08f29bdc5415db3af58fa60.zip
mtd: m25p80: Make fast read configurable via DT
Add DT property "m25p,fast-read" that signalises the particular chip supports "fast read" opcode. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/mtd/m25p80.txt29
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mtd/m25p80.txt b/Documentation/devicetree/bindings/mtd/m25p80.txt
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+++ b/Documentation/devicetree/bindings/mtd/m25p80.txt
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+* MTD SPI driver for ST M25Pxx (and similar) serial flash chips
+
+Required properties:
+- #address-cells, #size-cells : Must be present if the device has sub-nodes
+ representing partitions.
+- compatible : Should be the manufacturer and the name of the chip. Bear in mind
+ the DT binding is not Linux-only, but in case of Linux, see the
+ "m25p_ids" table in drivers/mtd/devices/m25p80.c for the list of
+ supported chips.
+- reg : Chip-Select number
+- spi-max-frequency : Maximum frequency of the SPI bus the chip can operate at
+
+Optional properties:
+- m25p,fast-read : Use the "fast read" opcode to read data from the chip instead
+ of the usual "read" opcode. This opcode is not supported by
+ all chips and support for it can not be detected at runtime.
+ Refer to your chips' datasheet to check if this is supported
+ by your chip.
+
+Example:
+
+ flash: m25p80@0 {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ compatible = "spansion,m25p80";
+ reg = <0>;
+ spi-max-frequency = <40000000>;
+ m25p,fast-read;
+ };