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dt-bindings: iio: afe: add binding for current-sense-amplifier 

Similar to current sense shunts, but an amplifier enables the use
of a smaller sense resistance.

Signed-off-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Peter Rosin 2018-04-23 23:08:08 +02:00 committed by Jonathan Cameron
parent ff915802fb
commit 2e9a128f35
2 changed files with 27 additions and 0 deletions
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26
Documentation/devicetree/bindings/iio/afe/current-sense-amplifier.txt Normal file
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Current Sense Amplifier
=======================
When an io-channel measures the output voltage from a current sense
amplifier, the interesting mesaurement is almost always the current
through the sense resistor, not the voltage output. This binding
describes such a current sense circuit.
Required properties:
- compatible : "current-sense-amplifier"
- io-channels : Channel node of a voltage io-channel.
- sense-resistor-micro-ohms : The sense resistance in microohms.
Optional properties:
- sense-gain-mult: Amplifier gain multiplier. The default is <1>.
- sense-gain-div: Amplifier gain divider. The default is <1>.
Example:
sysi {
compatible = "current-sense-amplifier";
io-channels = <&tiadc 0>;
sense-resistor-micro-ohms = <20000>;
sense-gain-mul = <50>;
};

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MAINTAINERS
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@ -6902,6 +6902,7 @@ 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-amplifier.txt
F: Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt
F: Documentation/devicetree/bindings/iio/afe/voltage-divider.txt