[PATCH v4 5/8] dt-bindings: iio: document dpot-dac bindings

Peter Rosin
2016-11-08T12:35:04Z

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
---
.../devicetree/bindings/iio/dac/dpot-dac.txt | 41 ++++++++++++++++++++++
MAINTAINERS | 6 ++++
2 files changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/dac/dpot-dac.txt

diff --git a/Documentation/devicetree/bindings/iio/dac/dpot-dac.txt b/Documentation/devicetree/bindings/iio/dac/dpot-dac.txt
new file mode 100644
index 000000000000..fdf47a01bfef
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/dpot-dac.txt
@@ -0,0 +1,41 @@
+Bindings for DAC emulation using a digital potentiometer
+
+It is assumed that the dpot is used as a voltage divider between the
+current dpot wiper setting and the maximum resistance of the dpot. The
+divided voltage is provided by a vref regulator.
+
+ .------.
+ .-----------. | |
+ | vref |--' .---.
+ | regulator |--. | |
+ '-----------' | | d |
+ | | p |
+ | | o | wiper
+ | | t |<---------+
+ | | |
+ | '---' dac output voltage
+ | |
+ '------+------------+
+
+Required properties:
+- compatible: Should be "dpot-dac"
+- vref-supply: The regulator supplying the voltage divider.
+- io-channels: Channel node of the dpot to be used for the voltage division.
+- io-channel-names: Should be "dpot".
+
+Example:
+
+ &i2c {
+ dpot: mcp4651-503@28 {
+ compatible = "microchip,mcp4651-503";
+ reg = <0x28>;
+ #io-channel-cells = <1>;
+ };
+ };
+
+ dac {
+ compatible = "dpot-dac";
+ vref-supply = <&reg_3v3>;
+ io-channels = <&dpot 0>;
+ io-channel-names = "dpot";
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 2409e1d79cb6..4ff9c12b1313 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6124,6 +6124,12 @@ L: linux-media@vger.kernel.org
S: Maintained
F: drivers/media/rc/iguanair.c

+IIO DIGITAL POTENTIOMETER DAC
+M: Peter Rosin <peda@axentia.se>
+L: linux-iio@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/iio/dac/dpot-dac.txt
+
IIO SUBSYSTEM AND DRIVERS
M: Jonathan Cameron <jic23@kernel.org>
R: Hartmut Knaack <knaack.h@gmx.de>
--
2.1.4