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authorCory Tusar <cory.tusar@pid1solutions.com>2016-01-07 06:55:01 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-10 04:27:45 +0300
commit862a4a7836ebe77beabcda844d03e1eab3e1cf19 (patch)
treed68018f81d190a21dbf710f073a07ad6e3cbe215 /Documentation
parentcb54ad6cddb606add2481b82901d69670b480d1b (diff)
downloadlinux-862a4a7836ebe77beabcda844d03e1eab3e1cf19.tar.xz
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: 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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/misc/eeprom-93xx46.txt25
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diff --git a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt b/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>;
+ };