linux-kernel - [PATCH v2 4/5] dt-bindings: iio: adc: adi,ad7606: add gain calibration support

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Message-Id: <20250502-wip-bl-ad7606-calibration-v2-4-174bd0af081b@baylibre.com>
Date: Fri, 02 May 2025 15:27:01 +0200
From: Angelo Dureghello <adureghello@...libre.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Hennerich <michael.hennerich@...log.com>, 
 devicetree@...r.kernel.org, Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v2 4/5] dt-bindings: iio: adc: adi,ad7606: add gain
 calibration support

From: Angelo Dureghello <adureghello@...libre.com>

Add gain calibration support by a per-channel resistor value.

Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
 .../devicetree/bindings/iio/adc/adi,ad7606.yaml    | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
index 29f12d650442b8ff2eb455306ce59a0e87867ddd..d4b8ea51f60be367e79a4db18d932cbca9c7dc91 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
@@ -204,6 +204,15 @@ patternProperties:
           considered a bipolar differential channel. Otherwise it is bipolar
           single-ended.
 
+      adi,rfilter-ohms:
+        description:
+          For ADCs that supports gain calibration, this property must be set to
+          the value of the external RFilter resistor. Proper gain error
+          correction is applied based on this value.
+        default: 0
+        minimum: 0
+        maximum: 65536
+
     required:
       - reg
       - bipolar
@@ -256,6 +265,25 @@ allOf:
       properties:
         adi,oversampling-ratio-gpios: false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - adi,ad7605-4
+              - adi,ad7606-4
+              - adi,ad7606-6
+              - adi,ad7606-8
+              - adi,ad7607
+              - adi,ad7608
+              - adi,ad7609
+              - adi,ad7616
+    then:
+      patternProperties:
+        "^channel@[0-9a-f]+$":
+          properties:
+            adi,rfilter-ohms: false
+
   - if:
       properties:
         compatible:
@@ -398,6 +426,7 @@ examples:
                 reg = <8>;
                 diff-channels = <8 8>;
                 bipolar;
+                adi,rfilter-ohms = <2048>;
             };
 
         };

-- 
2.49.0