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Commit 862a4a78 authored by Cory Tusar's avatar Cory Tusar Committed by Greg Kroah-Hartman
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Documentation: devicetree: Add DT bindings to eeprom_93xx46 driver. 



This commit documents bindings to be added to the eeprom_93xx46 driver
which will allow:

  - Device word size and read-only attributes to be specified.
  - A device-specific compatible string for use with Atmel AT93C46D
    EEPROMs.
  - Specifying a GPIO line to function as a 'select' or 'enable' signal
    prior to accessing the EEPROM.

Signed-off-by: default avatarCory Tusar <cory.tusar@pid1solutions.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Tested-by: default avatarChris Healy <chris.healy@zii.aero>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cb54ad6c

Documentation/devicetree/bindings/misc/eeprom-93xx46.txt

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EEPROMs (SPI) compatible with Microchip Technology 93xx46 family.



Required properties:

- compatible : shall be one of:

    "atmel,at93c46d"

    "eeprom-93xx46"

- data-size : number of data bits per word (either 8 or 16)



Optional properties:

- read-only : parameter-less property which disables writes to the EEPROM

- select-gpios : if present, specifies the GPIO that will be asserted prior to

  each access to the EEPROM (e.g. for SPI bus multiplexing)



Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt

apply.  In particular, "reg" and "spi-max-frequency" properties must be given.



Example:

	eeprom@0 {

		compatible = "eeprom-93xx46";

		reg = <0>;

		spi-max-frequency = <1000000>;

		spi-cs-high;

		data-size = <8>;

		select-gpios = <&gpio4 4 GPIO_ACTIVE_HIGH>;

	};