iio: adc: Document the regulator/clocks for exynos-adc

The exynos ADC won't work without a regulator called "vdd" and a clock
called "adc".  Document this fact in the device tree bindings.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
index 1fc744bd7166..47ada1dff216 100644
--- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
+++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
@@ -20,6 +20,9 @@ Required properties:
                         format is being dependent on which interrupt controller
                         the Samsung device uses.
 - #io-channel-cells = <1>; As ADC has multiple outputs
+- clocks                From common clock binding: handle to adc clock.
+- clock-names           From common clock binding: Shall be "adc".
+- vdd-supply            VDD input supply.
 
 Note: child nodes can be added for auto probing from device tree.
 
@@ -31,6 +34,11 @@ adc: adc@12D10000 {
         interrupts = <0 106 0>;
         #io-channel-cells = <1>;
         io-channel-ranges;
+
+        clocks = <&clock 303>;
+        clock-names = "adc";
+
+        vdd-supply = <&buck5_reg>;
 };