| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/iio/adc/envelope-detector.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: ADC envelope detector using a DAC and a comparator |
| 8 | |
| 9 | maintainers: |
| 10 | - Peter Rosin <peda@axentia.se> |
| 11 | |
| 12 | description: | |
| 13 | The DAC is used to find the peak level of an alternating voltage input |
| 14 | signal by a binary search using the output of a comparator wired to |
| 15 | an interrupt pin. Like so: |
| 16 | _ |
| 17 | | \ |
| 18 | input +------>-------|+ \ |
| 19 | | \ |
| 20 | .-------. | }---. |
| 21 | | | | / | |
| 22 | | dac|-->--|- / | |
| 23 | | | |_/ | |
| 24 | | | | |
| 25 | | | | |
| 26 | | irq|------<-------' |
| 27 | | | |
| 28 | '-------' |
| 29 | |
| 30 | properties: |
| 31 | compatible: |
| 32 | const: axentia,tse850-envelope-detector |
| 33 | |
| 34 | io-channels: |
| 35 | maxItems: 1 |
| 36 | description: Channel node of the dac to be used for comparator input. |
| 37 | |
| 38 | io-channel-names: |
| 39 | const: dac |
| 40 | |
| 41 | interrupts: |
| 42 | maxItems: 1 |
| 43 | |
| 44 | interrupt-names: |
| 45 | const: comp |
| 46 | |
| 47 | required: |
| 48 | - compatible |
| 49 | - io-channels |
| 50 | - io-channel-names |
| 51 | - interrupts |
| 52 | - interrupt-names |
| 53 | |
| 54 | additionalProperties: false |
| 55 | |
| 56 | examples: |
| 57 | - | |
| 58 | #include <dt-bindings/interrupt-controller/irq.h> |
| 59 | i2c { |
| 60 | #address-cells = <1>; |
| 61 | #size-cells = <0>; |
| 62 | dpot: dpot@28 { |
| 63 | compatible = "microchip,mcp4651-104"; |
| 64 | reg = <0x28>; |
| 65 | #io-channel-cells = <1>; |
| 66 | }; |
| 67 | }; |
| 68 | |
| 69 | dac: dac { |
| 70 | compatible = "dpot-dac"; |
| 71 | vref-supply = <®_3v3>; |
| 72 | io-channels = <&dpot 0>; |
| 73 | io-channel-names = "dpot"; |
| 74 | #io-channel-cells = <1>; |
| 75 | }; |
| 76 | |
| 77 | envelope-detector { |
| 78 | compatible = "axentia,tse850-envelope-detector"; |
| 79 | io-channels = <&dac 0>; |
| 80 | io-channel-names = "dac"; |
| 81 | |
| 82 | interrupt-parent = <&gpio>; |
| 83 | interrupts = <3 IRQ_TYPE_EDGE_FALLING>; |
| 84 | interrupt-names = "comp"; |
| 85 | }; |
| 86 | ... |