1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/iio/afe/current-sense-shunt.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: Current Sense Shunt 8 9maintainers: 10 - Peter Rosin <peda@axentia.se> 11 12description: | 13 When an io-channel measures the voltage over a current sense shunt, 14 the interesting measurement is almost always the current through the 15 shunt, not the voltage over it. This binding describes such a current 16 sense circuit. 17 18properties: 19 compatible: 20 const: current-sense-shunt 21 22 io-channels: 23 maxItems: 1 24 description: | 25 Channel node of a voltage io-channel. 26 27 "#io-channel-cells": 28 const: 0 29 30 shunt-resistor-micro-ohms: 31 description: The shunt resistance. 32 33required: 34 - compatible 35 - io-channels 36 - shunt-resistor-micro-ohms 37 38additionalProperties: false 39 40examples: 41 - | 42 i2c { 43 #address-cells = <1>; 44 #size-cells = <0>; 45 tiadc: adc@48 { 46 compatible = "ti,ads1015"; 47 reg = <0x48>; 48 #io-channel-cells = <1>; 49 50 #address-cells = <1>; 51 #size-cells = <0>; 52 53 channel@0 { /* IN0,IN1 differential */ 54 reg = <0>; 55 ti,gain = <1>; 56 ti,datarate = <4>; 57 }; 58 }; 59 }; 60 sysi { 61 compatible = "current-sense-shunt"; 62 io-channels = <&tiadc 0>; 63 #io-channel-cells = <0>; 64 65 /* Divide the voltage by 3300000/1000000 (or 3.3) for the current. */ 66 shunt-resistor-micro-ohms = <3300000>; 67 }; 68... 69