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>
diff --git a/Documentation/devicetree/bindings/mtd/m25p80.txt b/Documentation/devicetree/bindings/mtd/m25p80.txt
new file mode 100644
index 0000000..6d3d576
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/m25p80.txt
@@ -0,0 +1,29 @@
+* 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;
+ };