Kernel-4.18.0-80.el8_envelope-detector

Bindings for ADC envelope detector using a DAC and a comparator

The DAC is used to find the peak level of an alternating voltage input
signal by a binary search using the output of a comparator wired to
an interrupt pin. Like so:
_
|
input +——>——-|+
|
.——-. | }—.
| | | / |
| dac|–>–|- / |
| | |_/ |
| | |
| | |
| irq|——<——-‘
| |
‘——-‘

Required properties:

• compatible: Should be “axentia,tse850-envelope-detector”
• io-channels: Channel node of the dac to be used for comparator input.
• io-channel-names: Should be “dac”.
• interrupt specification for one client interrupt,
  see ../../interrupt-controller/interrupts.txt for details.
• interrupt-names: Should be “comp”.

Example:

&i2c {
    dpot: mcp4651-104@28 {
        compatible = "microchip,mcp4651-104";
        reg = <0x28>;
        #io-channel-cells = <1>;
    };
};

dac: dac {
    compatible = "dpot-dac";
    vref-supply = <&reg_3v3>;
    io-channels = <&dpot 0>;
    io-channel-names = "dpot";
    #io-channel-cells = <1>;
};

envelope-detector {
    compatible = "axentia,tse850-envelope-detector";
    io-channels = <&dac 0>;
    io-channel-names = "dac";

    interrupt-parent = <&gpio>;
    interrupts = <3 IRQ_TYPE_EDGE_FALLING>;
    interrupt-names = "comp";
};