| Message ID | 20180423210809.29586-2-peda@axentia.se (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, 23 Apr 2018 23:08:06 +0200 Peter Rosin <peda@axentia.se> wrote: > 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. > > Reviewed-by: Rob Herring <robh@kernel.org> > Signed-off-by: Peter Rosin <peda@axentia.se> One small whitespace issue inline that git am pointed out. I fixed it. Thanks, Jonathan > --- > .../bindings/iio/afe/current-sense-shunt.txt | 41 ++++++++++++++++++++++ > MAINTAINERS | 6 ++++ > 2 files changed, 47 insertions(+) > create mode 100644 Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt > > diff --git a/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt b/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt > new file mode 100644 > index 000000000000..4d842aa85040 > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt > @@ -0,0 +1,41 @@ > +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>; The line above has some stray spaces - cleaned up. > + #io-channel-cells = <1>; > + > + #address-cells = <1>; > + #size-cells = <0>; > + > + channel@0 { /* IN0,IN1 differential */ > + reg = <0>; > + ti,gain = <1>; > + ti,datarate = <4>; > + }; > + }; > +}; > diff --git a/MAINTAINERS b/MAINTAINERS > index 36a28e979e9a..0f7bec878919 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -6889,6 +6889,12 @@ 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> -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt b/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt new file mode 100644 index 000000000000..4d842aa85040 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/afe/current-sense-shunt.txt @@ -0,0 +1,41 @@ +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>; + }; + }; +}; diff --git a/MAINTAINERS b/MAINTAINERS index 36a28e979e9a..0f7bec878919 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6889,6 +6889,12 @@ 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>