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* SPI NOR flash: 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 : May include a device-specific string consisting of the
manufacturer and name of the chip. A list of supported chip
names follows.
Must also include "jedec,spi-nor" for any SPI NOR flash that can
be identified by the JEDEC READ ID opcode (0x9F).
Supported chip names:
at25df321a
at25df641
at26df081a
mr25h128
mr25h256
mr25h10
mr25h40
mx25l4005a
mx25l1606e
mx25l6405d
mx25l12805d
mx25l25635e
n25q064
n25q128a11
n25q128a13
n25q512a
s25fl256s1
s25fl512s
s25sl12801
s25fl008k
s25fl064k
sst25vf040b
m25p40
m25p80
m25p16
m25p32
m25p64
m25p128
w25x80
w25x32
w25q32
w25q64
w25q32dw
w25q80bl
w25q128
w25q256
The following chip names have been used historically to
designate quirky versions of flash chips that do not support the
JEDEC READ ID opcode (0x9F):
m25p05-nonjedec
m25p10-nonjedec
m25p20-nonjedec
m25p40-nonjedec
m25p80-nonjedec
m25p16-nonjedec
m25p32-nonjedec
m25p64-nonjedec
m25p128-nonjedec
- 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.
- broken-flash-reset : Some flash devices utilize stateful addressing modes
(e.g., for 32-bit addressing) which need to be managed
carefully by a system. Because these sorts of flash don't
have a standardized software reset command, and because some
systems don't toggle the flash RESET# pin upon system reset
(if the pin even exists at all), there are systems which
cannot reboot properly if the flash is left in the "wrong"
state. This boolean flag can be used on such systems, to
denote the absence of a reliable reset mechanism.
Example:
flash: m25p80@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "spansion,m25p80", "jedec,spi-nor";
reg = <0>;
spi-max-frequency = <40000000>;
m25p,fast-read;
};
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