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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/input/adc-keys.yaml
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# SPDX-License-Identifier: GPL-2.0

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/input/adc-keys.yaml#

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$schema: http://devicetree.org/meta-schemas/core.yaml#

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title: ADC attached resistor ladder buttons

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maintainers:

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  - Alexandre Belloni <alexandre.belloni@bootlin.com>

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allOf:

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  - $ref: input.yaml#

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properties:

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  compatible:

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    const: adc-keys

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  io-channels:

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    maxItems: 1

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  io-channel-names:

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    const: buttons

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  keyup-threshold-microvolt:

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    description:

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      Voltage above or equal to which all the keys are considered up.

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  poll-interval: true

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  autorepeat: true

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patternProperties:

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  '^button-':

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    type: object

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    $ref: input.yaml#

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    additionalProperties: false

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    description:

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      Each button (key) is represented as a sub-node.

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    properties:

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      label: true

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      linux,code: true

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      press-threshold-microvolt:

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        description:

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          Voltage above or equal to which this key is considered pressed. No

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          two values of press-threshold-microvolt may be the same. All values

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          of press-threshold-microvolt must be less than

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          keyup-threshold-microvolt.

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    required:

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      - linux,code

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      - press-threshold-microvolt

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required:

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  - compatible

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  - io-channels

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  - io-channel-names

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  - keyup-threshold-microvolt

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additionalProperties: false

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examples:

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  - |

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    #include <dt-bindings/input/input.h>

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    // +--------------------------------+------------------------+

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    // | 2.000.000 <= value             | no key pressed         |

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    // +--------------------------------+------------------------+

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    // | 1.500.000 <= value < 2.000.000 | KEY_VOLUMEUP pressed   |

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    // +--------------------------------+------------------------+

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    // | 1.000.000 <= value < 1.500.000 | KEY_VOLUMEDOWN pressed |

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    // +--------------------------------+------------------------+

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    // |   500.000 <= value < 1.000.000 | KEY_ENTER pressed      |

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    // +--------------------------------+------------------------+

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    // |              value <   500.000 | no key pressed         |

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    // +--------------------------------+------------------------+

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    adc-keys {

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        compatible = "adc-keys";

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        io-channels = <&lradc 0>;

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        io-channel-names = "buttons";

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        keyup-threshold-microvolt = <2000000>;

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        button-up {

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            label = "Volume Up";

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            linux,code = <KEY_VOLUMEUP>;

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            press-threshold-microvolt = <1500000>;

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        };

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        button-down {

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            label = "Volume Down";

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            linux,code = <KEY_VOLUMEDOWN>;

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            press-threshold-microvolt = <1000000>;

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        };

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        button-enter {

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            label = "Enter";

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            linux,code = <KEY_ENTER>;

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            press-threshold-microvolt = <500000>;

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        };

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    };

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...

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