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