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Diffstat (limited to 'Documentation/devicetree/bindings/eeprom')
-rw-r--r-- | Documentation/devicetree/bindings/eeprom/at24.txt | 85 | ||||
-rw-r--r-- | Documentation/devicetree/bindings/eeprom/at25.txt | 42 |
2 files changed, 127 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt new file mode 100644 index 000000000..f9a7c9842 --- /dev/null +++ b/Documentation/devicetree/bindings/eeprom/at24.txt @@ -0,0 +1,85 @@ +EEPROMs (I2C) + +Required properties: + + - compatible: Must be a "<manufacturer>,<model>" pair. The following <model> + values are supported (assuming "atmel" as manufacturer): + + "atmel,24c00", + "atmel,24c01", + "atmel,24cs01", + "atmel,24c02", + "atmel,24cs02", + "atmel,24mac402", + "atmel,24mac602", + "atmel,spd", + "atmel,24c04", + "atmel,24cs04", + "atmel,24c08", + "atmel,24cs08", + "atmel,24c16", + "atmel,24cs16", + "atmel,24c32", + "atmel,24cs32", + "atmel,24c64", + "atmel,24cs64", + "atmel,24c128", + "atmel,24c256", + "atmel,24c512", + "atmel,24c1024", + "atmel,24c2048", + + If <manufacturer> is not "atmel", then a fallback must be used + with the same <model> and "atmel" as manufacturer. + + Example: + compatible = "microchip,24c128", "atmel,24c128"; + + Supported manufacturers are: + + "catalyst", + "microchip", + "nxp", + "ramtron", + "renesas", + "rohm", + "st", + + Some vendors use different model names for chips which are just + variants of the above. Known such exceptions are listed below: + + "nxp,se97b" - the fallback is "atmel,24c02", + "renesas,r1ex24002" - the fallback is "atmel,24c02" + "renesas,r1ex24128" - the fallback is "atmel,24c128" + "rohm,br24t01" - the fallback is "atmel,24c01" + + - reg: The I2C address of the EEPROM. + +Optional properties: + + - pagesize: The length of the pagesize for writing. Please consult the + manual of your device, that value varies a lot. A wrong value + may result in data loss! If not specified, a safety value of + '1' is used which will be very slow. + + - read-only: This parameterless property disables writes to the eeprom. + + - size: Total eeprom size in bytes. + + - no-read-rollover: This parameterless property indicates that the + multi-address eeprom does not automatically roll over + reads to the next slave address. Please consult the + manual of your device. + + - wp-gpios: GPIO to which the write-protect pin of the chip is connected. + + - address-width: number of address bits (one of 8, 16). + +Example: + +eeprom@52 { + compatible = "atmel,24c32"; + reg = <0x52>; + pagesize = <32>; + wp-gpios = <&gpio1 3 0>; +}; diff --git a/Documentation/devicetree/bindings/eeprom/at25.txt b/Documentation/devicetree/bindings/eeprom/at25.txt new file mode 100644 index 000000000..b3bde97dc --- /dev/null +++ b/Documentation/devicetree/bindings/eeprom/at25.txt @@ -0,0 +1,42 @@ +EEPROMs (SPI) compatible with Atmel at25. + +Required properties: +- compatible : Should be "<vendor>,<type>", and generic value "atmel,at25". + Example "<vendor>,<type>" 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>; + }; |