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The at24 driver allows to register I2C EEPROM chips using different vendor and devices, but the I2C subsystem does not take the vendor into account when matching using the I2C table since it only has device entries. But when matching using an OF table, both the vendor and device has to be taken into account so the driver defines only a set of compatible strings using the "atmel" vendor as a generic fallback for compatible I2C devices. Document in the Device Tree binding document that this manufacturer should be used as the generic fallback. Also document the deprecated vendors. Suggested-by: Wolfram Sang <wsa@the-dreams.de> Suggested-by: Rob Herring <robh@kernel.org> Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
EEPROMs (I2C)
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Required properties:
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- compatible : should be "<manufacturer>,<type>", like these:
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"atmel,24c00", "atmel,24c01", "atmel,24c02", "atmel,24c04",
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"atmel,24c08", "atmel,24c16", "atmel,24c32", "atmel,24c64",
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"atmel,24c128", "atmel,24c256", "atmel,24c512", "atmel,24c1024"
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"catalyst,24c32"
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"microchip,24c128"
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"ramtron,24c64"
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"renesas,r1ex24002"
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The following manufacturers values have been deprecated:
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"at", "at24"
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If there is no specific driver for <manufacturer>, a generic
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device with <type> and manufacturer "atmel" should be used.
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Possible types are:
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"24c00", "24c01", "24c02", "24c04", "24c08", "24c16", "24c32", "24c64",
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"24c128", "24c256", "24c512", "24c1024", "spd"
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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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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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};
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