[PATCH] iio: adc: Add bindigs documentation for twl6030 GPADC

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Add required documentation for twl6030 GPADC device tree
bindings.

Signed-off-by: Oleksandr Kozaruk <oleksandr.kozaruk@xxxxxx>
---
 .../devicetree/bindings/iio/adc/twl6030-gpadc.txt  | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/twl6030-gpadc.txt

diff --git a/Documentation/devicetree/bindings/iio/adc/twl6030-gpadc.txt b/Documentation/devicetree/bindings/iio/adc/twl6030-gpadc.txt
new file mode 100644
index 0000000..6cd3ef3
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/twl6030-gpadc.txt
@@ -0,0 +1,45 @@
+Texas Instruments twl6030/twl6032 GPADC device driver
+
+Required properties:
+	- compatible: must be "ti,twl6030-gpadc" for TWL6030 or
+	  "ti,twl6032-gpadc" for TWL6032
+	- interrupts: interrupt number associated with it
+	- #io-channel-cells: must be <1> - multiple IIO outputs are present
+	  iio consumers can use following io-channels:
+		twl6030:
+			0 - battery type
+			1 - battery temperature resistor value
+			2 - audio accessory/general purpose
+			3 - general purpose
+			4 - temperature/general purpose
+			5 - general purpose
+			6 - general purpose
+			7 - main battery
+			8 - backup battery
+			9 - charger input
+			10 - VBUS
+			11 - VBUS charging current
+			14 - USB ID
+		twl6032:
+			0 - battery type
+			1 - battery temperature resistor value
+			2 - audio accessory/general purpose
+			3 - temperature with external diode/general purpose
+			4 - temperature/general purpose
+			5 - general purpose
+			6 - general purpose
+			7 - system supply
+			8 - backup battery
+			9 - charger input
+			10 - VBUS
+			11 - VBUS charging current
+			14 - USB ID
+			17 - battery charging current
+			18 - battery voltage
+
+Example:
+	adc {
+		compatible = "ti,twl6030-gpadc";
+		interrupts = <3>;
+		#io-channel-cells = <1>;
+	};
-- 
1.8.1.2

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