dt-bindings: iio: dac: Add docs for AD5758 DAC

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/Documentation/devicetree/bindings/iio/dac/ad5758.txt b/Documentation/devicetree/bindings/iio/dac/ad5758.txt
new file mode 100644 (file)
index 0000000..bba01a5
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/ad5758.txt
@@ -0,0 +1,78 @@
+Analog Devices AD5758 DAC device driver
+
+Required properties for the AD5758:
+       - compatible: Must be "adi,ad5758"
+       - reg: SPI chip select number for the device
+       - spi-max-frequency: Max SPI frequency to use (< 50000000)
+       - spi-cpha: is the only mode that is supported
+
+Required properties:
+
+ - adi,dc-dc-mode: Mode of operation of the dc-to-dc converter
+                  Dynamic Power Control (DPC)
+                  In this mode, the AD5758 circuitry senses the output
+                  voltage and dynamically regulates the supply voltage,
+                  VDPC+, to meet compliance requirements plus an optimized
+                  headroom voltage for the output buffer.
+
+                  Programmable Power Control (PPC)
+                  In this mode, the VDPC+ voltage is user-programmable to
+                  a fixed level that needs to accommodate the maximum output
+                  load required.
+
+                  The output of the DAC core is either converted to a
+                  current or voltage output at the VIOUT pin. Only one mode
+                  can be enabled at any one time.
+
+                  The following values are currently supported:
+                       * 1: DPC current mode
+                       * 2: DPC voltage mode
+                       * 3: PPC current mode
+
+ Depending on the selected output mode (voltage or current) one of the
+ two properties must
+ be present:
+
+ - adi,range-microvolt: Voltage output range
+               The array of voltage output ranges must contain two fields:
+               * <0 5000000>: 0 V to 5 V voltage range
+               * <0 10000000>: 0 V to 10 V voltage range
+               * <(-5000000) 5000000>: ±5 V voltage range
+               * <(-10000000) 10000000>: ±10 V voltage range
+ - adi,range-microamp: Current output range
+               The array of current output ranges must contain two fields:
+               * <0 20000>: 0 mA to 20 mA current range
+               * <0 24000>: 0 mA to 24 mA current range
+               * <4 24000>: 4 mA to 20 mA current range
+               * <(-20000) 20000>: ±20 mA current range
+               * <(-24000) 24000>: ±24 mA current range
+               * <(-1000) 22000>: −1 mA to +22 mA current range
+
+Optional properties:
+
+ - adi,dc-dc-ilim-microamp: The dc-to-dc converter current limit
+                  The following values are currently supported [uA]:
+                       * 150000
+                       * 200000
+                       * 250000
+                       * 300000
+                       * 350000
+                       * 400000
+
+ - adi,slew-time-us: The time it takes for the output to reach the
+ full scale [uS]
+                    The supported range is between 133us up to 1023984375us
+
+AD5758 Example:
+
+       dac@0 {
+               compatible = "adi,ad5758";
+               reg = <0>;
+               spi-max-frequency = <1000000>;
+               spi-cpha;
+
+               adi,dc-dc-mode = <2>;
+               adi,range-microvolt = <0 10000000>;
+               adi,dc-dc-ilim-microamp = <200000>;
+               adi,slew-time-us = <125000>;
+       };

diff --git a/MAINTAINERS b/MAINTAINERS
index 728ae34b7b322498f50002034bf5faefcc28f18c..83a439c659254f89af7bfe74baa856292ffe6ba2 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -802,6 +802,7 @@ L:  linux-iio@vger.kernel.org
 W:     http://ez.analog.com/community/linux-device-drivers
 S:     Supported
 F:     drivers/iio/dac/ad5758.c
+F:     Documentation/devicetree/bindings/iio/dac/ad5758.txt
 
 ANALOG DEVICES INC AD5686 DRIVER
 M:     Stefan Popa <stefan.popa@analog.com>