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Date:   Sat, 9 Oct 2021 00:11:30 +0200
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Subject: [PATCH 5/3] dt-bindings: iio: io-channel-mux: allow duplicate
 channel, labels
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To:     Vincent Whitchurch <vincent.whitchurch@axis.com>, jic23@kernel.org,
        devicetree@vger.kernel.org
Cc:     kernel@axis.com, lars@metafoo.de, linux-iio@vger.kernel.org,
        robh+dt@kernel.org, linux-kernel@vger.kernel.org
References: <20211007134641.13417-1-vincent.whitchurch@axis.com>
 <20211007134641.13417-3-vincent.whitchurch@axis.com>
From:   Peter Rosin <peda@axentia.se>
Organization: Axentia Technologies AB
In-Reply-To: <20211007134641.13417-3-vincent.whitchurch@axis.com>
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This is needed since an empty channel label is used to indicate an
unused channel, and there can be more that one of those.

Fixes the following problem reported by dtbs_check:
envelope-detector-mux: channels: ['', '', 'sync-1', 'in', 'out', 'sync-2', 'sys-reg', 'ana-reg'] has non-unique elements
	arch/arm/boot/dts/at91-tse850-3.dt.yaml

Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
---
 .../devicetree/bindings/iio/multiplexer/io-channel-mux.yaml  | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml b/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml
index 80b6229a6fad..611ad4444cf0 100644
--- a/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml
+++ b/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.yaml
@@ -35,9 +35,10 @@ properties:
   mux-control-names: true
 
   channels:
-    $ref: /schemas/types.yaml#/definitions/string-array
+    $ref: /schemas/types.yaml#/definitions/non-unique-string-array
     description:
-      List of strings, labeling the mux controller states.
+      List of strings, labeling the mux controller states. An empty
+      string for a state means that the channel is not available.
 
   settle-time-us:
     default: 0
-- 
2.20.1