dt-bindings: iio: adc: Add docs for AD7768-1

Document support for AD7768-1 Analog to Digital Converter.

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/adc/adi,ad7768-1.txt b/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.txt
new file mode 100644 (file)
index 0000000..9f5b88c
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.txt
@@ -0,0 +1,41 @@
+Analog Devices AD7768-1 ADC device driver
+
+Required properties for the AD7768-1:
+
+- compatible: Must be "adi,ad7768-1"
+- reg: SPI chip select number for the device
+- spi-max-frequency: Max SPI frequency to use
+       see: Documentation/devicetree/bindings/spi/spi-bus.txt
+- clocks: phandle to the master clock (mclk)
+       see: Documentation/devicetree/bindings/clock/clock-bindings.txt
+- clock-names: Must be "mclk".
+- interrupts: IRQ line for the ADC
+       see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+- vref-supply: vref supply can be used as reference for conversion
+- adi,sync-in-gpios: must be the device tree identifier of the SYNC-IN pin. Enables
+       synchronization of multiple devices that require simultaneous sampling.
+       A pulse is always required if the configuration is changed in any way, for example
+       if the filter decimation rate changes. As the line is active low, it should
+       be marked GPIO_ACTIVE_LOW.
+
+Optional properties:
+
+ - reset-gpios : GPIO spec for the RESET pin. If specified, it will be asserted during
+       driver probe. As the line is active low, it should be marked GPIO_ACTIVE_LOW.
+
+Example:
+
+       adc@0 {
+               compatible = "adi,ad7768-1";
+               reg = <0>;
+               spi-max-frequency = <2000000>;
+               spi-cpol;
+               spi-cpha;
+               vref-supply = <&adc_vref>;
+               interrupts = <25 IRQ_TYPE_EDGE_RISING>;
+               interrupt-parent = <&gpio>;
+               adi,sync-in-gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+               reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
+               clocks = <&ad7768_mclk>;
+               clock-names = "mclk";
+       };

diff --git a/MAINTAINERS b/MAINTAINERS
index 3ba3811..e5613b6 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -868,6 +868,7 @@ L:  linux-iio@vger.kernel.org
 W:     http://ez.analog.com/community/linux-device-drivers
 S:     Supported
 F:     drivers/iio/adc/ad7768-1.c
+F:     Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.txt
 
 ANALOG DEVICES INC AD9389B DRIVER
 M:     Hans Verkuil <hans.verkuil@cisco.com>