[deliverable/linux.git] / Documentation / devicetree / bindings / eeprom / at25.txt

EEPROMs (SPI) compatible with Atmel at25.

Required properties:
- compatible : "atmel,at25".
- 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, 16, or 24)

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 are 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:
	at25@0 {
		compatible = "atmel,at25", "st,m95256";
		reg = <0>
		spi-max-frequency = <5000000>;
		spi-cpha;
		spi-cpol;

		pagesize = <64>;
		size = <32768>;
		address-width = <16>;
	};
Commit	Line	Data
d6ae0d57	1	EEPROMs (SPI) compatible with Atmel at25.
002176db APS	2
	3	Required properties:
	4	- compatible : "atmel,at25".
	5	- reg : chip select number
	6	- spi-max-frequency : max spi frequency to use
d6ae0d57 DD	7	- pagesize : size of the eeprom page
	8	- size : total eeprom size in bytes
	9	- address-width : number of address bits (one of 8, 16, or 24)
002176db	10
d6ae0d57 DD	11	Optional properties:
	12	- spi-cpha : SPI shifted clock phase, as per spi-bus bindings.
	13	- spi-cpol : SPI inverse clock polarity, as per spi-bus bindings.
	14	- read-only : this parameter-less property disables writes to the eeprom
	15
	16	Obsolete legacy properties are can be used in place of "size", "pagesize",
	17	"address-width", and "read-only":
002176db APS	18	- at25,byte-len : total eeprom size in bytes
	19	- at25,addr-mode : addr-mode flags, as defined in include/linux/spi/eeprom.h
	20	- at25,page-size : size of the eeprom page
	21
d6ae0d57 DD	22	Additional compatible properties are also allowed.
	23
	24	Example:
	25	at25@0 {
	26	compatible = "atmel,at25", "st,m95256";
	27	reg = <0>
	28	spi-max-frequency = <5000000>;
	29	spi-cpha;
	30	spi-cpol;
002176db	31
d6ae0d57 DD	32	pagesize = <64>;
	33	size = <32768>;
	34	address-width = <16>;
	35	};