[PATCH 1/1] dt-bindings: iio: adc: max1238: Add #io-channel-cells property

[Frank Li]

Add #io-channel-cells property because it is multi-channel ADC.

Fix below CHECK_DTBS warnings:
  arch/arm/boot/dts/nxp/ls/ls1021a-iot.dtb: adc@35 (maxim,max1239): '#io-channel-cells' does not match any of the regexes: '^pinctrl-[0-9]+$'
	from schema $id: http://devicetree.org/schemas/iio/adc/maxim,max1238.yaml#

Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
 Documentation/devicetree/bindings/iio/adc/maxim,max1238.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/maxim,max1238.yaml b/Documentation/devicetree/bindings/iio/adc/maxim,max1238.yaml
index 60d7b34e3286f..ae3c89393f1a3 100644
--- a/Documentation/devicetree/bindings/iio/adc/maxim,max1238.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/maxim,max1238.yaml
@@ -53,6 +53,9 @@ properties:
   reg:
     maxItems: 1
 
+  "#io-channel-cells":
+    const: 1
+
   vcc-supply: true
   vref-supply:
     description: Optional external reference.  If not supplied, internal
-- 
2.34.1