Kernel-4.18.0-80.el8_at25

EEPROMs (SPI) compatible with Atmel at25.

Required properties:

• compatible : Should be “,“, and generic value “atmel,at25”.
  Example “,“ values:
  “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

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;

    pagesize = <64>;
    size = <32768>;
    address-width = <16>;
};