[PATCH v5 4/5] dt-bindings: iio: adc: adi,ad7606: add gain calibration support

Angelo Dureghello
2025-05-19T10:15:37Z

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

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Angelo Dureghello <adureghello@baylibre.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..6926f5f090ad6bbbe7bfd9327dc5ae17dafcd1fd 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: 64512
+
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