dt-bindings: iio: adc: Add docs for AD7606 ADC

Document support for AD7606 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,ad7606.txt b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.txt
new file mode 100644 (file)
index 0000000..d7b6241
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.txt
@@ -0,0 +1,65 @@
+Analog Devices AD7606 Simultaneous Sampling ADC
+
+Required properties for the AD7606:
+
+- compatible: Must be one of
+       * "adi,ad7605-4"
+       * "adi,ad7606-8"
+       * "adi,ad7606-6"
+       * "adi,ad7606-4"
+- reg: SPI chip select number for the device
+- spi-max-frequency: Max SPI frequency to use
+       see: Documentation/devicetree/bindings/spi/spi-bus.txt
+- spi-cpha: See Documentation/devicetree/bindings/spi/spi-bus.txt
+- avcc-supply: phandle to the Avcc power supply
+- interrupts: IRQ line for the ADC
+       see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+- adi,conversion-start-gpios: must be the device tree identifier of the CONVST pin.
+                 This logic input is used to initiate conversions on the analog
+                 input channels. As the line is active high, it should be marked
+                 GPIO_ACTIVE_HIGH.
+
+Optional properties:
+
+- reset-gpios: must be the device tree identifier of the RESET pin. If specified,
+              it will be asserted during driver probe. As the line is active high,
+              it should be marked GPIO_ACTIVE_HIGH.
+- standby-gpios: must be the device tree identifier of the STBY pin. This pin is used
+               to place the AD7606 into one of two power-down modes, Standby mode or
+               Shutdown mode. As the line is active low, it should be marked
+               GPIO_ACTIVE_LOW.
+- adi,first-data-gpios: must be the device tree identifier of the FRSTDATA pin.
+                   The FRSTDATA output indicates when the first channel, V1, is
+                   being read back on either the parallel, byte or serial interface.
+                   As the line is active high, it should be marked GPIO_ACTIVE_HIGH.
+- adi,range-gpios: must be the device tree identifier of the RANGE pin. The polarity on
+             this pin determines the input range of the analog input channels. If
+             this pin is tied to a logic high, the analog input range is ±10V for
+             all channels. If this pin is tied to a logic low, the analog input range
+             is ±5V for all channels. As the line is active high, it should be marked
+             GPIO_ACTIVE_HIGH.
+- adi,oversampling-ratio-gpios: must be the device tree identifier of the over-sampling
+                               mode pins. As the line is active high, it should be marked
+                               GPIO_ACTIVE_HIGH.
+
+Example:
+
+       adc@0 {
+               compatible = "adi,ad7606-8";
+               reg = <0>;
+               spi-max-frequency = <1000000>;
+               spi-cpol;
+
+               avcc-supply = <&adc_vref>;
+
+               interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
+               interrupt-parent = <&gpio>;
+
+               adi,conversion-start-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+               reset-gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
+               adi,first-data-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
+               adi,oversampling-ratio-gpios = <&gpio 18 GPIO_ACTIVE_HIGH
+                                               &gpio 23 GPIO_ACTIVE_HIGH
+                                               &gpio 26 GPIO_ACTIVE_HIGH>;
+               standby-gpios = <&gpio 24 GPIO_ACTIVE_LOW>;
+       };

diff --git a/MAINTAINERS b/MAINTAINERS
index bc9f816..d039f66 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -860,6 +860,7 @@ L:  linux-iio@vger.kernel.org
 W:     http://ez.analog.com/community/linux-device-drivers
 S:     Supported
 F:     drivers/iio/adc/ad7606.c
+F:     Documentation/devicetree/bindings/iio/adc/ad7606.txt
 
 ANALOG DEVICES INC AD9389B DRIVER
 M:     Hans Verkuil <hans.verkuil@cisco.com>