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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/afe/current-sense-shunt.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Current Sense Shunt
maintainers:
- Peter Rosin <peda@axentia.se>
description: |
When an io-channel measures the voltage over a current sense shunt,
the interesting measurement is almost always the current through the
shunt, not the voltage over it. This binding describes such a current
sense circuit.
properties:
compatible:
const: current-sense-shunt
io-channels:
maxItems: 1
description: |
Channel node of a voltage io-channel.
shunt-resistor-micro-ohms:
description: The shunt resistance.
required:
- compatible
- io-channels
- shunt-resistor-micro-ohms
additionalProperties: false
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
tiadc: adc@48 {
compatible = "ti,ads1015";
reg = <0x48>;
#io-channel-cells = <1>;
#address-cells = <1>;
#size-cells = <0>;
channel@0 { /* IN0,IN1 differential */
reg = <0>;
ti,gain = <1>;
ti,datarate = <4>;
};
};
};
sysi {
compatible = "current-sense-shunt";
io-channels = <&tiadc 0>;
/* Divide the voltage by 3300000/1000000 (or 3.3) for the current. */
shunt-resistor-micro-ohms = <3300000>;
};
...
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