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Message-ID: <1477176226-10566-5-git-send-email-peda@axentia.se>
Date: Sun, 23 Oct 2016 00:43:43 +0200
From: Peter Rosin <peda@...ntia.se>
To: <linux-kernel@...r.kernel.org>
CC: Peter Rosin <peda@...ntia.se>, Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
"Peter Meerwald-Stadler" <pmeerw@...erw.net>,
Rob Herring <robh+dt@...nel.org>,
"Mark Rutland" <mark.rutland@....com>, <linux-iio@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: [PATCH v2 4/7] dt-bindings: iio: document dpot-dac bindings
Signed-off-by: Peter Rosin <peda@...ntia.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..4fd5d63cc2d6
--- /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 the 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 = <®_3v3>;
+ io-channels = <&dpot 0>;
+ io-channel-names = "dpot";
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 1cd38a7e0064..c68b72088945 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6111,6 +6111,12 @@ L: linux-media@...r.kernel.org
S: Maintained
F: drivers/media/rc/iguanair.c
+IIO DIGITAL POTENTIOMETER DAC
+M: Peter Rosin <peda@...ntia.se>
+L: linux-iio@...r.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/iio/dac/dpot-dac.txt
+
IIO SUBSYSTEM AND DRIVERS
M: Jonathan Cameron <jic23@...nel.org>
R: Hartmut Knaack <knaack.h@....de>
--
2.1.4
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