linux-kernel - [PATCH v2 1/5] dt-bindings: iio: adc: ad7380: fix ad7380-4 reference supply

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Message-Id: <20241021-ad7380-fix-supplies-v2-1-2ca551b3352a@baylibre.com>
Date: Mon, 21 Oct 2024 12:00:09 +0200
From: Julien Stephan <jstephan@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 David Lechner <dlechner@...libre.com>, Jonathan Cameron <jic23@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Liam Girdwood <lgirdwood@...il.com>, 
 Mark Brown <broonie@...nel.org>, Jonathan Corbet <corbet@....net>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, linux-doc@...r.kernel.org, 
 Julien Stephan <jstephan@...libre.com>
Subject: [PATCH v2 1/5] dt-bindings: iio: adc: ad7380: fix ad7380-4
 reference supply

ad7380-4 is the only device from ad738x family that doesn't have an
internal reference. Moreover its external reference is called REFIN in
the datasheet while all other use REFIO as an optional external
reference. If refio-supply is omitted the internal reference is
used.

Fix the binding by adding refin-supply and makes it required for
ad7380-4 only.

Fixes: 1a291cc8ee17 ("dt-bindings: iio: adc: ad7380: add support for ad738x-4 4 channels variants")
Signed-off-by: Julien Stephan <jstephan@...libre.com>
---
 .../devicetree/bindings/iio/adc/adi,ad7380.yaml     | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
index bd19abb867d98d46bdd1c9e0c197e10f06979204..0065d650882489e21b952bb9fb25f1e3a070ee68 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
@@ -67,6 +67,10 @@ properties:
       A 2.5V to 3.3V supply for the external reference voltage. When omitted,
       the internal 2.5V reference is used.
 
+  refin-supply:
+    description:
+      A 2.5V to 3.3V supply for external reference voltage, for ad7380-4 only.
+
   aina-supply:
     description:
       The common mode voltage supply for the AINA- pin on pseudo-differential
@@ -135,6 +139,23 @@ allOf:
         ainc-supply: false
         aind-supply: false
 
+  # ad7380-4 uses refin-supply as external reference.
+  # All other chips from ad738x family use refio as optional external reference.
+  # When refio-supply is omitted, internal reference is used.
+  - if:
+      properties:
+        compatible:
+          enum:
+            - adi,ad7380-4
+    then:
+      properties:
+        refio-supply: false
+      required:
+        - refin-supply
+    else:
+      properties:
+        refin-supply: false
+
 examples:
   - |
     #include <dt-bindings/interrupt-controller/irq.h>

-- 
2.47.0