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Current Sense Shunt
===================
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.
Required properties:
- compatible : "current-sense-shunt"
- io-channels : Channel node of a voltage io-channel.
- shunt-resistor-micro-ohms : The shunt resistance in microohms.
Example:
The system current is measured by measuring the voltage over a
3.3 ohms shunt resistor.
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>;
};
&i2c {
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>;
};
};
};
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