From 2e9a128f359c1baa8f0fbfdb95a1b40f84244801 Mon Sep 17 00:00:00 2001 From: Peter Rosin Date: Mon, 23 Apr 2018 23:08:08 +0200 Subject: [PATCH] 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 Reviewed-by: Rob Herring Signed-off-by: Jonathan Cameron --- .../bindings/iio/afe/current-sense-amplifier.txt | 26 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 27 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/afe/current-sense-amplifier.txt diff --git a/Documentation/devicetree/bindings/iio/afe/current-sense-amplifier.txt b/Documentation/devicetree/bindings/iio/afe/current-sense-amplifier.txt new file mode 100644 index 0000000..0ddbaeb --- /dev/null +++ b/Documentation/devicetree/bindings/iio/afe/current-sense-amplifier.txt @@ -0,0 +1,26 @@ +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>; +}; diff --git a/MAINTAINERS b/MAINTAINERS index 35987f6..d1c0f58 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6902,6 +6902,7 @@ IIO UNIT CONVERTER M: Peter Rosin 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 -- 2.7.4