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