diff mbox series

[v4,3/4] dt-bindings: iio: afe: add binding for current-sense-amplifier

Message ID 20180423210809.29586-4-peda@axentia.se
State Not Applicable, archived
Headers show
Series iio: add unit-converter | expand

Commit Message

Peter Rosin April 23, 2018, 9:08 p.m. UTC 
Similar to current sense shunts, but an amplifier enables the use
of a smaller sense resistance.

Signed-off-by: Peter Rosin <peda@axentia.se>
---
 .../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

Comments

Rob Herring (Arm) April 27, 2018, 2:30 p.m. UTC | #1 
On Mon, Apr 23, 2018 at 11:08:08PM +0200, Peter Rosin wrote:
> Similar to current sense shunts, but an amplifier enables the use
> of a smaller sense resistance.
> 
> Signed-off-by: Peter Rosin <peda@axentia.se>
> ---
>  .../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

Reviewed-by: Rob Herring <robh@kernel.org>

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Jonathan Cameron April 28, 2018, 5:02 p.m. UTC | #2 
On Fri, 27 Apr 2018 09:30:25 -0500
Rob Herring <robh@kernel.org> wrote:

> On Mon, Apr 23, 2018 at 11:08:08PM +0200, Peter Rosin wrote:
> > Similar to current sense shunts, but an amplifier enables the use
> > of a smaller sense resistance.
> > 
> > Signed-off-by: Peter Rosin <peda@axentia.se>
> > ---
> >  .../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  
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> 
Applied

Thanks,

Jonathan
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diff mbox series

Patch

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 000000000000..0ddbaebba8ce
--- /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 4d534c9321de..1b23e9ebff9c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6893,6 +6893,7 @@  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