On Wed, Apr 11, 2018 at 04:15:54PM +0200, Peter Rosin wrote: > This is a current sense amplifier from Analog Devices. > > Signed-off-by: Peter Rosin <peda@xxxxxxxxxx> > --- > .../devicetree/bindings/iio/afe/adi,lt6106.txt | 50 ++++++++++++++++++++++ > MAINTAINERS | 1 + > 2 files changed, 51 insertions(+) > create mode 100644 Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt > > diff --git a/Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt b/Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt > new file mode 100644 > index 000000000000..98b6d93596f2 > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/afe/adi,lt6106.txt > @@ -0,0 +1,50 @@ > +LT6106 36V High Side Current Sence Amplifier > +============================================ > + > +This binding assumes the typical application of the current sense amplifier > +as described in the LT6106 datasheet. > + > +http://www.analog.com/media/en/technical-documentation/data-sheets/6106fb.pdf > + > + .------. > + Vin --------------------+--------------+-|Rsense|-+-----. > + | | '------' | | > + | | | .---. > + .--------------------. .---. | | L | > + | V+ | |Rin| | | O | > + | | '---' | | A | > + | | | | | D | > + | -IN |----' | '---' > + Vout ---+----| OUT LT6106 | | | > + | | +IN |---------------' GND > + .----. | | > + |Rout| | | > + '----' | V- | > + | '--------------------' > + | | > + GND GND > + > +The voltage Vsense over Rsense is measured by looking at Vout. They > +are related as Vout = Vsense * Rout / Rin. The current Isense through > +Rsense is (almost) the same as that through the LOAD. Hence, the > +interesting LOAD current can be calculated as > + > + Vout * Rin / (Rout * Rsense) > + > +Required properties: > +- compatible : "adi,lt6106" > +- io-channels : Channel node of an io-channel measuring Vout. > +- sense-resistor-micro-ohms : The Rsense resistance in microohms. > +- input-resistor-ohms : The Rin resistance in ohms. > +- output-resistor-ohms : The Rout resistance in ohms. Are these generic or specific to this binding? For the latter, they shoudl have vendor prefix. > + > +Example: > + > +sysi { > + compatible = "adi,lt6106"; > + io-channels = <&tiadc 0>; > + > + sense-resistor-micro-ohms = <20000>; > + input-resistor-ohms = <200>; > + output-resistor-ohms = <10000>; > +}; -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
