[PATCH v2 4/4] dt-bindings: iio: adc: lpc32xx-adc: Document vref-supply

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As most of the other ADC the lpc32xx one use a vref-supply property:
document it.

Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx>
---
 Documentation/devicetree/bindings/iio/adc/lpc32xx-adc.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/lpc32xx-adc.txt b/Documentation/devicetree/bindings/iio/adc/lpc32xx-adc.txt
index b3629d3a9adf..3a1bc669bd51 100644
--- a/Documentation/devicetree/bindings/iio/adc/lpc32xx-adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/lpc32xx-adc.txt
@@ -6,6 +6,10 @@ Required properties:
   region.
 - interrupts: The ADC interrupt
 
+Optional:
+ - vref-supply: The regulator supply ADC reference voltage, optional
+   for legacy reason, but highly encouraging to us in new device tree
+
 Example:
 
 	adc@40048000 {
@@ -13,4 +17,5 @@ Example:
 		reg = <0x40048000 0x1000>;
 		interrupt-parent = <&mic>;
 		interrupts = <39 0>;
+		vref-supply = <&vcc>;
 	};
-- 
2.20.1




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