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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/iio/adc/envelope-detector.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/iio/adc/envelope-detector.yaml#

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

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title: ADC envelope detector using a DAC and a comparator

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maintainers:

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  - Peter Rosin <peda@axentia.se>

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description: |

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  The DAC is used to find the peak level of an alternating voltage input

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  signal by a binary search using the output of a comparator wired to

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  an interrupt pin. Like so:

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                          _

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                         | \

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    input +------>-------|+ \

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                         |   \

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           .-------.     |    }---.

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           |       |     |   /    |

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           |    dac|-->--|- /     |

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           |       |     |_/      |

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           |       |              |

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           |       |              |

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           |    irq|------<-------'

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           |       |

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           '-------'

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properties:

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  compatible:

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    const: axentia,tse850-envelope-detector

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  io-channels:

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    maxItems: 1

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    description: Channel node of the dac to be used for comparator input.

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  io-channel-names:

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    const: dac

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  interrupts:

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    maxItems: 1

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  interrupt-names:

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    const: comp

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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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  - interrupts

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  - interrupt-names

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additionalProperties: false

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examples:

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  - |

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    #include <dt-bindings/interrupt-controller/irq.h>

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    i2c {

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        #address-cells = <1>;

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        #size-cells = <0>;

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        dpot: dpot@28 {

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            compatible = "microchip,mcp4651-104";

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            reg = <0x28>;

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            #io-channel-cells = <1>;

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        };

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    };

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    dac: dac {

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        compatible = "dpot-dac";

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        vref-supply = <&reg_3v3>;

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        io-channels = <&dpot 0>;

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        io-channel-names = "dpot";

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        #io-channel-cells = <1>;

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    };

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    envelope-detector {

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        compatible = "axentia,tse850-envelope-detector";

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        io-channels = <&dac 0>;

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        io-channel-names = "dac";

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        interrupt-parent = <&gpio>;

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        interrupts = <3 IRQ_TYPE_EDGE_FALLING>;

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        interrupt-names = "comp";

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    };

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...

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