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Commit 1351b50c authored by Peter Rosin's avatar Peter Rosin Committed by Jonathan Cameron
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dt-bindings: iio: afe: add binding for current-sense-shunt 



An ADC is often used to measure other quantities indirectly. This
binding describe one cases, a current through a shunt resistor
measured by the voltage over it.

Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 5cb0789d

Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt

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Current Sense Shunt

===================



When an io-channel measures the voltage over a current sense shunt,

the interesting mesaurement 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>;

		};

	};

};

MAINTAINERS

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@@ -6898,6 +6898,12 @@ F: drivers/staging/iio/ 
F:	include/linux/iio/

F:	tools/iio/



IIO UNIT CONVERTER

M:	Peter Rosin <peda@axentia.se>

L:	linux-iio@vger.kernel.org

S:	Maintained

F:	Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt



IKANOS/ADI EAGLE ADSL USB DRIVER

M:	Matthieu Castet <castet.matthieu@free.fr>

M:	Stanislaw Gruszka <stf_xl@wp.pl>