FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/eeprom/at25.txt

     EEPROMs (SPI) compatible with Atmel at25.
     
     Required properties:
     - compatible : Should be "<vendor>,<type>", and generic value "atmel,at25".
       Example "<vendor>,<type>" values:
         "anvo,anv32e61w"
         "microchip,25lc040"
         "st,m95m02"
         "st,m95256"
    
    - reg : chip select number
    - spi-max-frequency : max spi frequency to use
    - pagesize : size of the eeprom page
    - size : total eeprom size in bytes
    - address-width : number of address bits (one of 8, 9, 16, or 24).
      For 9 bits, the MSB of the address is sent as bit 3 of the instruction
      byte, before the address byte.
    
    Optional properties:
    - spi-cpha : SPI shifted clock phase, as per spi-bus bindings.
    - spi-cpol : SPI inverse clock polarity, as per spi-bus bindings.
    - read-only : this parameter-less property disables writes to the eeprom
    - wp-gpios : GPIO to which the write-protect pin of the chip is connected
    
    Obsolete legacy properties can be used in place of "size", "pagesize",
    "address-width", and "read-only":
    - at25,byte-len : total eeprom size in bytes
    - at25,addr-mode : addr-mode flags, as defined in include/linux/spi/eeprom.h
    - at25,page-size : size of the eeprom page
    
    Additional compatible properties are also allowed.
    
    Example:
            eeprom@0 {
                    compatible = "st,m95256", "atmel,at25";
                    reg = <0>
                    spi-max-frequency = <5000000>;
                    spi-cpha;
                    spi-cpol;
                    wp-gpios = <&gpio1 3 0>;
    
                    pagesize = <64>;
                    size = <32768>;
                    address-width = <16>;
            };

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