[PATCH v3 1/2] dt-bindings: iio: adc: xlnx,zynqmp-ams: limit external channels to 30-50

[Arnav Kapoor <kapoorarnav43@gmail.com>]

Channels 20 to 29 of the PL-SYSMON block are its fixed channels (PL
temperature to VCCADC), which the driver always provides. Only channels
30 to 50 (the differential input, VUser0-3 and VAux0-15) are external
channels that can be described as "channel@N" child nodes, yet the
binding accepts any N from 20 to 50. Listing one of the fixed channels
there only makes the driver add it a second time.

Limit the child nodes to channels 30 to 50.

Fixes: 39dd2d1e251d ("dt-bindings: iio: adc: Add Xilinx AMS binding documentation")
Suggested-by: Sai Krishna Potthuri <sai.krishna.potthuri@amd.com>
Signed-off-by: Arnav Kapoor <kapoorarnav43@gmail.com>
---
 .../devicetree/bindings/iio/adc/xlnx,zynqmp-ams.yaml       | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/xlnx,zynqmp-ams.yaml b/Documentation/devicetree/bindings/iio/adc/xlnx,zynqmp-ams.yaml
index 3ae1a0bab38f..0872f5f314c1 100644
--- a/Documentation/devicetree/bindings/iio/adc/xlnx,zynqmp-ams.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/xlnx,zynqmp-ams.yaml
@@ -160,17 +160,18 @@ properties:
         const: 0
 
     patternProperties:
-      "^channel@([2-4][0-9]|50)$":
+      "^channel@([34][0-9]|50)$":
         type: object
         description:
-          Describes the external channels connected.
+          Describes the external channels connected. Channels 20 to 29 are
+          always available and are not listed here.
 
         properties:
           reg:
             description:
               Pair of pins the channel is connected to. This value is
               same as Channel Number for a particular channel.
-            minimum: 20
+            minimum: 30
             maximum: 50
 
           xlnx,bipolar:
-- 
2.53.0