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dt-bindings: iio: io-channel-mux: document io-channel-mux bindings 

Describe how a multiplexer can be used to select which signal is fed to
an io-channel.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Rosin 2017-05-14 21:51:09 +02:00 committed by Greg Kroah-Hartman
parent 8a848e7549
commit a36954f58f
2 changed files with 45 additions and 0 deletions
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39
Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt Normal file
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I/O channel multiplexer bindings
If a multiplexer is used to select which hardware signal is fed to
e.g. an ADC channel, these bindings describe that situation.
Required properties:
- compatible : "io-channel-mux"
- io-channels : Channel node of the parent channel that has multiplexed
input.
- io-channel-names : Should be "parent".
- #address-cells = <1>;
- #size-cells = <0>;
- mux-controls : Mux controller node to use for operating the mux
- channels : List of strings, labeling the mux controller states.
For each non-empty string in the channels property, an io-channel will
be created. The number of this io-channel is the same as the index into
the list of strings in the channels property, and also matches the mux
controller state. The mux controller state is described in
../mux/mux-controller.txt
Example:
mux: mux-controller {
compatible = "mux-gpio";
#mux-control-cells = <0>;
mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
<&pioA 1 GPIO_ACTIVE_HIGH>;
};
adc-mux {
compatible = "io-channel-mux";
io-channels = <&adc 0>;
io-channel-names = "parent";
mux-controls = <&mux>;
channels = "sync", "in", "system-regulator";
};

6
MAINTAINERS
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@ -6481,6 +6481,12 @@ F: Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector
F: Documentation/devicetree/bindings/iio/adc/envelope-detector.txt
F: drivers/iio/adc/envelope-detector.c
IIO MULTIPLEXER
M: Peter Rosin <peda@axentia.se>
L: linux-iio@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/iio/multiplexer/iio-mux.txt
IIO SUBSYSTEM AND DRIVERS
M: Jonathan Cameron <jic23@kernel.org>
R: Hartmut Knaack <knaack.h@gmx.de>