Documentation/devicetree/bindings/eeprom/at24.txt

   1 EEPROMs (I2C)
   2
   3 Required 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
  59 Optional 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
  81 Example:
  82
  83 eeprom@52 {
  84         compatible = "atmel,24c32";
  85         reg = <0x52>;
  86         pagesize = <32>;
  87         wp-gpios = <&gpio1 3 0>;
  88         num-addresses = <8>;
  89 };