[PATCH v5 6/9] dt-bindings: iio: add vref support to sd modulator

[Olivier Moysan]

Allow to specify the reference voltage used by the SD modulator.
When the SD modulator is defined as an IIO backend, the reference
voltage can be used to evaluate scaling information of the IIO device.
The reference voltage is not used otherwise.

Signed-off-by: Olivier Moysan <olivier.moysan@xxxxxxxxxxx>
---
 .../bindings/iio/adc/sigma-delta-modulator.yaml           | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
index b245971fecb0..ff04ae08f264 100644
--- a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
@@ -31,6 +31,14 @@ anyOf:
   - required: ['#io-backend-cells']
   - required: ['#io-channel-cells']
 
+if:
+  required:
+    - '#io-backend-cells'
+then:
+  properties:
+    vref-supply:
+      description: Phandle to the vref input analog reference voltage.
+
 additionalProperties: false
 
 examples:
-- 
2.25.1