tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1EEPROMs (I2C)
2
3Required properties:
4
5 - compatible: Must be a "<manufacturer>,<model>" pair. The following <model>
6 values are supported (assuming "atmel" as manufacturer):
7
8 "atmel,24c00",
9 "atmel,24c01",
10 "atmel,24cs01",
11 "atmel,24c02",
12 "atmel,24cs02",
13 "atmel,24mac402",
14 "atmel,24mac602",
15 "atmel,spd",
16 "atmel,24c04",
17 "atmel,24cs04",
18 "atmel,24c08",
19 "atmel,24cs08",
20 "atmel,24c16",
21 "atmel,24cs16",
22 "atmel,24c32",
23 "atmel,24cs32",
24 "atmel,24c64",
25 "atmel,24cs64",
26 "atmel,24c128",
27 "atmel,24c256",
28 "atmel,24c512",
29 "atmel,24c1024",
30 "atmel,24c2048",
31
32 If <manufacturer> is not "atmel", then a fallback must be used
33 with the same <model> and "atmel" as manufacturer.
34
35 Example:
36 compatible = "microchip,24c128", "atmel,24c128";
37
38 Supported manufacturers are:
39
40 "catalyst",
41 "microchip",
42 "nxp",
43 "ramtron",
44 "renesas",
45 "rohm",
46 "st",
47
48 Some vendors use different model names for chips which are just
49 variants of the above. Known such exceptions are listed below:
50
51 "nxp,se97b" - the fallback is "atmel,24c02",
52 "renesas,r1ex24002" - the fallback is "atmel,24c02"
53 "renesas,r1ex24016" - the fallback is "atmel,24c16"
54 "renesas,r1ex24128" - the fallback is "atmel,24c128"
55 "rohm,br24t01" - the fallback is "atmel,24c01"
56
57 - reg: The I2C address of the EEPROM.
58
59Optional properties:
60
61 - pagesize: The length of the pagesize for writing. Please consult the
62 manual of your device, that value varies a lot. A wrong value
63 may result in data loss! If not specified, a safety value of
64 '1' is used which will be very slow.
65
66 - read-only: This parameterless property disables writes to the eeprom.
67
68 - size: Total eeprom size in bytes.
69
70 - no-read-rollover: This parameterless property indicates that the
71 multi-address eeprom does not automatically roll over
72 reads to the next slave address. Please consult the
73 manual of your device.
74
75 - wp-gpios: GPIO to which the write-protect pin of the chip is connected.
76
77 - address-width: number of address bits (one of 8, 16).
78
79 - num-addresses: total number of i2c slave addresses this device takes
80
81Example:
82
83eeprom@52 {
84 compatible = "atmel,24c32";
85 reg = <0x52>;
86 pagesize = <32>;
87 wp-gpios = <&gpio1 3 0>;
88 num-addresses = <8>;
89};