| # 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. |
| |
| "#io-channel-cells": |
| const: 0 |
| |
| 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>; |
| #io-channel-cells = <0>; |
| |
| /* Divide the voltage by 3300000/1000000 (or 3.3) for the current. */ |
| shunt-resistor-micro-ohms = <3300000>; |
| }; |
| ... |
