[PATCH 4/3] dt-bindings: iio: io-channel-mux: add optional #io-channel-cells

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Needed for in-kernel use of the child channels of the mux.

Fixes problems like this, reported by dtbs_check:
adc0mux: '#io-channel-cells' does not match any of the regexes: 'pinctrl-[0-9]+'
	arch/arm/boot/dts/aspeed-bmc-ampere-mtjade.dt.yaml

Suggested-by: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
---
 .../devicetree/bindings/iio/multiplexer/io-channel-mux.yaml    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml b/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml
index 5a7328042c76..80b6229a6fad 100644
--- a/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml
+++ b/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml
@@ -44,6 +44,9 @@ properties:
     description:
       Time required for analog signals to settle after muxing.
 
+  "#io-channel-cells":
+    const: 1
+
 required:
   - compatible
   - io-channels
-- 
2.20.1




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