forked from Minki/linux
862a4a7836
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: Cory Tusar <cory.tusar@pid1solutions.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Chris Healy <chris.healy@zii.aero>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
26 lines
798 B
Plaintext
26 lines
798 B
Plaintext
EEPROMs (SPI) compatible with Microchip Technology 93xx46 family.
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Required properties:
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- compatible : shall be one of:
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"atmel,at93c46d"
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"eeprom-93xx46"
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- data-size : number of data bits per word (either 8 or 16)
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Optional properties:
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- read-only : parameter-less property which disables writes to the EEPROM
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- select-gpios : if present, specifies the GPIO that will be asserted prior to
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each access to the EEPROM (e.g. for SPI bus multiplexing)
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Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt
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apply. In particular, "reg" and "spi-max-frequency" properties must be given.
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Example:
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eeprom@0 {
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compatible = "eeprom-93xx46";
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reg = <0>;
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spi-max-frequency = <1000000>;
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spi-cs-high;
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data-size = <8>;
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select-gpios = <&gpio4 4 GPIO_ACTIVE_HIGH>;
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};
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