From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../bindings/iio/adc/envelope-detector.yaml        | 86 ++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/envelope-detector.yaml

(limited to 'Documentation/devicetree/bindings/iio/adc/envelope-detector.yaml')

diff --git a/Documentation/devicetree/bindings/iio/adc/envelope-detector.yaml b/Documentation/devicetree/bindings/iio/adc/envelope-detector.yaml
new file mode 100644
index 0000000000..296d5459b4
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/envelope-detector.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/envelope-detector.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ADC envelope detector using a DAC and a comparator
+
+maintainers:
+  - Peter Rosin <peda@axentia.se>
+
+description: |
+  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|------<-------'
+           |       |
+           '-------'
+
+properties:
+  compatible:
+    const: axentia,tse850-envelope-detector
+
+  io-channels:
+    maxItems: 1
+    description: Channel node of the dac to be used for comparator input.
+
+  io-channel-names:
+    const: dac
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-names:
+    const: comp
+
+required:
+  - compatible
+  - io-channels
+  - io-channel-names
+  - interrupts
+  - interrupt-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        dpot: dpot@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";
+    };
+...
-- 
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