[PATCH v4] dt-bindings: iio: afe: voltage-divider: Add io-channel-cells

[Naresh Solanki <naresh.solanki@9elements.com>]

Enable the voltage divider to both receive and provide measurement
services by adding #io-channel-cells.

This is especially valuable in scenarios where an ADC has an analog
frontend, like a voltage divider, and obtaining its raw value isn't
interesting. It is desired to get the real voltage before the voltage
divider.

Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com>
---
 .../devicetree/bindings/iio/afe/voltage-divider.yaml  | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml b/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
index dddf97b50549..fd3c511e1beb 100644
--- a/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
+++ b/Documentation/devicetree/bindings/iio/afe/voltage-divider.yaml
@@ -39,6 +39,17 @@ properties:
     description: |
       Channel node of a voltage io-channel.
 
+  '#io-channel-cells':
+    description:
+      In addition to consuming the measurement services of a voltage
+      output channel, the voltage divider can act as a provider of
+      measurement services to other devices. This is particularly
+      useful in scenarios wherein an ADC has an analog frontend,
+      such as a voltage divider, and then consuming its raw value
+      isn't interesting. It is desired to get the real voltage
+      before the voltage divider.
+    const: 1
+
   output-ohms:
     description:
       Resistance Rout over which the output voltage is measured. See full-ohms.

base-commit: 99bd3cb0d12e85d5114425353552121ec8f93adc
-- 
2.42.0