[PATCH v5 8/9] dt-bindings: iio: adc: adi,ad7380: add spi-rx-bus-width property

David Lechner
2026-01-12T17:46:42Z

Add spi-rx-bus-width property to describe how many SDO lines are wired
up on the ADC. These chips are simultaneous sampling ADCs and have one
SDO line per channel, either 2 or 4 total depending on the part number.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: David Lechner <dlechner@baylibre.com>
---
v4 changes:
* Change to use spi-rx-bus-width property instead of spi-lanes.

v3 changes:
* Renamed "buses" to "lanes" to reflect devicetree property name change.
---
.../devicetree/bindings/iio/adc/adi,ad7380.yaml | 23 ++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
index b91bfb16ed6b..396e1a1aa805 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
@@ -62,6 +62,11 @@ properties:
spi-cpol: true
spi-cpha: true

+ spi-rx-bus-width:
+ maxItems: 4
+ items:
+ maximum: 1
+
vcc-supply:
description: A 3V to 3.6V supply that powers the chip.

@@ -160,6 +165,23 @@ patternProperties:
unevaluatedProperties: false

allOf:
+ # 2-channel chips only have two SDO lines
+ - if:
+ properties:
+ compatible:
+ enum:
+ - adi,ad7380
+ - adi,ad7381
+ - adi,ad7383
+ - adi,ad7384
+ - adi,ad7386
+ - adi,ad7387
+ - adi,ad7388
+ then:
+ properties:
+ spi-rx-bus-width:
+ maxItems: 2
+
# pseudo-differential chips require common mode voltage supplies,
# true differential chips don't use them
- if:
@@ -284,6 +306,7 @@ examples:
spi-cpol;
spi-cpha;
spi-max-frequency = <80000000>;
+ spi-rx-bus-width = <1>, <1>, <1>, <1>;

interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
interrupt-parent = <&gpio0>;

--
2.43.0