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EEPROMs (I2C)
Required properties:
- compatible: Must be a "<manufacturer>,<model>" pair. The following <model>
values are supported (assuming "atmel" as manufacturer):
"atmel,24c00",
"atmel,24c01",
"atmel,24cs01",
"atmel,24c02",
"atmel,24cs02",
"atmel,24mac402",
"atmel,24mac602",
"atmel,spd",
"atmel,24c04",
"atmel,24cs04",
"atmel,24c08",
"atmel,24cs08",
"atmel,24c16",
"atmel,24cs16",
"atmel,24c32",
"atmel,24cs32",
"atmel,24c64",
"atmel,24cs64",
"atmel,24c128",
"atmel,24c256",
"atmel,24c512",
"atmel,24c1024",
"atmel,24c2048",
If <manufacturer> is not "atmel", then a fallback must be used
with the same <model> and "atmel" as manufacturer.
Example:
compatible = "microchip,24c128", "atmel,24c128";
Supported manufacturers are:
"catalyst",
"microchip",
"nxp",
"ramtron",
"renesas",
"rohm",
"st",
Some vendors use different model names for chips which are just
variants of the above. Known such exceptions are listed below:
"nxp,se97b" - the fallback is "atmel,24c02",
"renesas,r1ex24002" - the fallback is "atmel,24c02"
"renesas,r1ex24016" - the fallback is "atmel,24c16"
"renesas,r1ex24128" - the fallback is "atmel,24c128"
"rohm,br24t01" - the fallback is "atmel,24c01"
- reg: The I2C address of the EEPROM.
Optional properties:
- pagesize: The length of the pagesize for writing. Please consult the
manual of your device, that value varies a lot. A wrong value
may result in data loss! If not specified, a safety value of
'1' is used which will be very slow.
- read-only: This parameterless property disables writes to the eeprom.
- size: Total eeprom size in bytes.
- no-read-rollover: This parameterless property indicates that the
multi-address eeprom does not automatically roll over
reads to the next slave address. Please consult the
manual of your device.
- wp-gpios: GPIO to which the write-protect pin of the chip is connected.
- address-width: number of address bits (one of 8, 16).
- num-addresses: total number of i2c slave addresses this device takes
Example:
eeprom@52 {
compatible = "atmel,24c32";
reg = <0x52>;
pagesize = <32>;
wp-gpios = <&gpio1 3 0>;
num-addresses = <8>;
};
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