40 lines
1.1 KiB
Plaintext
40 lines
1.1 KiB
Plaintext
|
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 = "gpio-mux";
|
||
|
|
#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";
|
||
|
|
};
|