70 lines
1.5 KiB
Plaintext
70 lines
1.5 KiB
Plaintext
GPIO-based multiplexer controller bindings
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Define what GPIO pins are used to control a multiplexer. Or several
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multiplexers, if the same pins control more than one multiplexer.
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Required properties:
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- compatible : "gpio-mux"
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- mux-gpios : list of gpios used to control the multiplexer, least
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significant bit first.
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- #mux-control-cells : <0>
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* Standard mux-controller bindings as decribed in mux-controller.txt
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Optional properties:
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- idle-state : if present, the state the mux will have when idle. The
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special state MUX_IDLE_AS_IS is the default.
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The multiplexer state is defined as the number represented by the
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multiplexer GPIO pins, where the first pin is the least significant
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bit. An active pin is a binary 1, an inactive pin is a binary 0.
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Example:
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mux: mux-controller {
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compatible = "gpio-mux";
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#mux-control-cells = <0>;
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mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
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<&pioA 1 GPIO_ACTIVE_HIGH>;
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};
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adc-mux {
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compatible = "io-channel-mux";
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io-channels = <&adc 0>;
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io-channel-names = "parent";
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mux-controls = <&mux>;
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channels = "sync-1", "in", "out", "sync-2";
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};
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i2c-mux {
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compatible = "i2c-mux";
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i2c-parent = <&i2c1>;
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mux-controls = <&mux>;
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#address-cells = <1>;
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#size-cells = <0>;
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i2c@0 {
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reg = <0>;
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#address-cells = <1>;
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#size-cells = <0>;
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ssd1307: oled@3c {
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/* ... */
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};
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};
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i2c@3 {
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reg = <3>;
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#address-cells = <1>;
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#size-cells = <0>;
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pca9555: pca9555@20 {
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/* ... */
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};
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};
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};
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