From: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---
drivers/staging/iio/Documentation/adc/ad7192.txt | 60 ++++++++++++++++++++++++
1 file changed, 60 insertions(+)
create mode 100644 drivers/staging/iio/Documentation/adc/ad7192.txt
diff --git a/drivers/staging/iio/Documentation/adc/ad7192.txt b/drivers/staging/iio/Documentation/adc/ad7192.txt
new file mode 100644
index 000000000000..19efc0a9411c
--- /dev/null
+++ b/drivers/staging/iio/Documentation/adc/ad7192.txt
@@ -0,0 +1,60 @@
+Analog Devices AD719x ADC Driver
+
+1. Overview
+
+The driver is intended to work with all AD719x ADC chips
+from Analog Devices (AD7190, AD7192, AD7193, AD7195).
+
+It's based on top of the AD Sigma Delta driver
+
+2. Device Tree Configuration
+
+Example for use on a Raspberry Pi with interrupt line
+connected to PIN 25 on the GPIO:
+
+ adc_vref: fixedregulator@0 {
+ reg = <0>;
+
+ compatible = "regulator-fixed";
+ regulator-name = "fixed-supply";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-boot-on;
+ };
+
+ ad7190@0 {
+ compatible = "ad7190";
+ reg = <0>;
+ spi-max-frequency = <1000000>;
+ spi-cpol;
+ spi-cpha;
+
+ #interrupt-cells = <2>;
+ interrupts = <25 0x2>;
+ interrupt-parent = <&gpio>;
+ avdd-supply = <&adc_vref>;
+
+ adi,clock-source-select = /bits/ 8 <0>;
+ adi,reference-voltage-mv = /bits/ 16 <3300>;
+
+ adi,refin2-pins-enable;
+ adi,rejection-60-Hz-enable;
+ adi,chop-enable;
+ adi,buffer-enable;
+ adi,burnout-currents-enable;
+ adi,sinc3-filter-enable;
+ adi,unipolar-enable;
+ };
+
+Notes (about this example):
+* be sure to replace `compatible = "ad7190";` with
+ your actual chip model (ad7190, ad7192, ad7193, ad7195)
+ in order to make sure it works correctly
+* PIN 25 must also be connected also to the DOUT pin
+ of the ADC (or MISO on the host)
+* be sure to add the "/bits/" specifiers ; newer dtc versions
+ specify the property type/size using this field,
+ and the driver may not be able to find the property
+* not all "adi,xxx" parameters are required ;
+ see the datasheet to get an idea of what you need
+
--
2.14.1
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