[PATCH RFC 2/3] dt-bindings: iio: adc: Add excitation current sources properties
From: Kurt Borja <kuurtb@gmail.com>
Date: 2026-06-19 00:33:20
Also in:
linux-iio, lkml
Subsystem:
iio subsystem and drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Jonathan Cameron, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Some ADCs incorporate current sources that provide excitation current to resistive temperature devices (RTDs), thermistors diodes and other resistive sensors that require constant current biasing. The maxItems constraint of 16 is arbitrary but should be big enough for most devices. Signed-off-by: Kurt Borja <kuurtb@gmail.com> --- Documentation/devicetree/bindings/iio/adc/adc.yaml | 23 ++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/Documentation/devicetree/bindings/iio/adc/adc.yaml b/Documentation/devicetree/bindings/iio/adc/adc.yaml
index c74c2084fdb68c..106b1e317411d5 100644
--- a/Documentation/devicetree/bindings/iio/adc/adc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adc.yaml@@ -83,6 +83,29 @@ properties: This array describes either a single reference source or a positive and negative reference sources. + excitation-channels: + $ref: /schemas/types.yaml#/definitions/uint32-array + maxItems: 16 + minItems: 1 + description: + Excitation current sources provide current to resistive temperature + devices (RTDs), thermistors diodes and other resistive sensors that + require constant current biasing. + + This array describes the mux configuration of the excitation current + sources. + + excitation-current-microamp: + maxItems: 16 + minItems: 1 + description: + Excitation current sources provide current to resistive temperature + devices (RTDs), thermistors diodes and other resistive sensors that + require constant current biasing. + + This array describes the current configuration of the excitation current + sources or the single matched current for all sources. + anyOf: - oneOf: - required:
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2.54.0