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dt-bindings: mux-adg792a: document devicetree bindings for ADG792A/G mux

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Analog Devices ADG792A/G is a triple 4:1 mux.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Peter Rosin 2017-05-14 21:51:13 +02:00 committed by Greg Kroah-Hartman
parent ac8498f0ce
commit f6689802eb
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Documentation/devicetree/bindings/mux/adi,adg792a.txt Normal file
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Bindings for Analog Devices ADG792A/G Triple 4:1 Multiplexers
Required properties:
- compatible : "adi,adg792a" or "adi,adg792g"
- #mux-control-cells : <0> if parallel (the three muxes are bound together
with a single mux controller controlling all three muxes), or <1> if
not (one mux controller for each mux).
* Standard mux-controller bindings as described in mux-controller.txt
Optional properties for ADG792G:
- gpio-controller : if present, #gpio-cells below is required.
- #gpio-cells : should be <2>
- First cell is the GPO line number, i.e. 0 or 1
- Second cell is used to specify active high (0)
or active low (1)
Optional properties:
- idle-state : if present, array of states that the mux controllers will have
when idle. The special state MUX_IDLE_AS_IS is the default and
MUX_IDLE_DISCONNECT is also supported.
States 0 through 3 correspond to signals A through D in the datasheet.
Example:
/*
* Three independent mux controllers (of which one is used).
* Mux 0 is disconnected when idle, mux 1 idles in the previously
* selected state and mux 2 idles with signal B.
*/
&i2c0 {
mux: mux-controller@50 {
compatible = "adi,adg792a";
reg = <0x50>;
#mux-control-cells = <1>;
idle-state = <MUX_IDLE_DISCONNECT MUX_IDLE_AS_IS 1>;
};
};
adc-mux {
compatible = "io-channel-mux";
io-channels = <&adc 0>;
io-channel-names = "parent";
mux-controls = <&mux 2>;
channels = "sync-1", "", "out";
};
/*
* Three parallel muxes with one mux controller, useful e.g. if
* the adc is differential, thus needing two signals to be muxed
* simultaneously for correct operation.
*/
&i2c0 {
pmux: mux-controller@50 {
compatible = "adi,adg792a";
reg = <0x50>;
#mux-control-cells = <0>;
idle-state = <1>;
};
};
diff-adc-mux {
compatible = "io-channel-mux";
io-channels = <&adc 0>;
io-channel-names = "parent";
mux-controls = <&pmux>;
channels = "sync-1", "", "out";
};