tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1EEPROMs (SPI) compatible with Atmel at25.
2
3Required properties:
4- compatible : Should be "<vendor>,<type>", and generic value "atmel,at25".
5 Example "<vendor>,<type>" values:
6 "microchip,25lc040"
7 "st,m95m02"
8 "st,m95256"
9
10- reg : chip select number
11- spi-max-frequency : max spi frequency to use
12- pagesize : size of the eeprom page
13- size : total eeprom size in bytes
14- address-width : number of address bits (one of 8, 9, 16, or 24).
15 For 9 bits, the MSB of the address is sent as bit 3 of the instruction
16 byte, before the address byte.
17
18Optional properties:
19- spi-cpha : SPI shifted clock phase, as per spi-bus bindings.
20- spi-cpol : SPI inverse clock polarity, as per spi-bus bindings.
21- read-only : this parameter-less property disables writes to the eeprom
22
23Obsolete legacy properties can be used in place of "size", "pagesize",
24"address-width", and "read-only":
25- at25,byte-len : total eeprom size in bytes
26- at25,addr-mode : addr-mode flags, as defined in include/linux/spi/eeprom.h
27- at25,page-size : size of the eeprom page
28
29Additional compatible properties are also allowed.
30
31Example:
32 eeprom@0 {
33 compatible = "st,m95256", "atmel,at25";
34 reg = <0>
35 spi-max-frequency = <5000000>;
36 spi-cpha;
37 spi-cpol;
38
39 pagesize = <64>;
40 size = <32768>;
41 address-width = <16>;
42 };