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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/devicetree/bindings/mux/gpio-mux.txt | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/devicetree/bindings/mux/gpio-mux.txt')
-rw-r--r-- | Documentation/devicetree/bindings/mux/gpio-mux.txt | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mux/gpio-mux.txt b/Documentation/devicetree/bindings/mux/gpio-mux.txt new file mode 100644 index 000000000..b8f746344 --- /dev/null +++ b/Documentation/devicetree/bindings/mux/gpio-mux.txt @@ -0,0 +1,69 @@ +GPIO-based multiplexer controller bindings + +Define what GPIO pins are used to control a multiplexer. Or several +multiplexers, if the same pins control more than one multiplexer. + +Required properties: +- compatible : "gpio-mux" +- mux-gpios : list of gpios used to control the multiplexer, least + significant bit first. +- #mux-control-cells : <0> +* Standard mux-controller bindings as decribed in mux-controller.txt + +Optional properties: +- idle-state : if present, the state the mux will have when idle. The + special state MUX_IDLE_AS_IS is the default. + +The multiplexer state is defined as the number represented by the +multiplexer GPIO pins, where the first pin is the least significant +bit. An active pin is a binary 1, an inactive pin is a binary 0. + +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-1", "in", "out", "sync-2"; + }; + + i2c-mux { + compatible = "i2c-mux"; + i2c-parent = <&i2c1>; + + mux-controls = <&mux>; + + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + + ssd1307: oled@3c { + /* ... */ + }; + }; + + i2c@3 { + reg = <3>; + #address-cells = <1>; + #size-cells = <0>; + + pca9555: pca9555@20 { + /* ... */ + }; + }; + }; |