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69 lines
1.5 KiB
69 lines
1.5 KiB
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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