[PATCH v2 1/1] dt-bindings: iio: imx8qxp-adc: add missing vref-supply

[Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>]

Although this property is used right now for IIO_CHAN_INFO_SCALE,
this ADC has two internal reference voltages, which the driver currently
doesn't make use of.

Fixes: db73419d8c06 ("dt-bindings: iio: adc: Add binding documentation for NXP IMX8QXP ADC")
Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
---
Thanks for your inputs. This improved descritpion should make it clear
that this property is only about the external reference voltage, not
about the optional, internal voltages.

Changes in v2:
* Improved commit message subject as suggested
* Add hint about feature flag regarding multiple, internal, reference
  voltages

 .../devicetree/bindings/iio/adc/nxp,imx8qxp-adc.yaml       | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/nxp,imx8qxp-adc.yaml b/Documentation/devicetree/bindings/iio/adc/nxp,imx8qxp-adc.yaml
index 63369ba388e4..878e67054d7c 100644
--- a/Documentation/devicetree/bindings/iio/adc/nxp,imx8qxp-adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/nxp,imx8qxp-adc.yaml
@@ -39,6 +39,12 @@ properties:
   power-domains:
     maxItems: 1
 
+  vref-supply:
+    description: |
+      External ADC reference voltage supply on VREFH pad. If VERID[MVI] is
+      set, there are additional, internal reference voltages selectable.
+      VREFH1 is always from VREFH pad.
+
   "#io-channel-cells":
     const: 1
 
@@ -72,6 +78,7 @@ examples:
             assigned-clocks = <&clk IMX_SC_R_ADC_0>;
             assigned-clock-rates = <24000000>;
             power-domains = <&pd IMX_SC_R_ADC_0>;
+            vref-supply = <&reg_1v8>;
             #io-channel-cells = <1>;
         };
     };
-- 
2.34.1