linux-kernel - [PATCH v4 8/9] dt-bindings: iio: adc: adi,ad7380: add spi-rx-bus-width property

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Message-Id: <20251219-spi-add-multi-bus-support-v4-8-145dc5204cd8@baylibre.com>
Date: Fri, 19 Dec 2025 15:32:16 -0600
From: David Lechner <dlechner@...libre.com>
To: Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Marcelo Schmitt <marcelo.schmitt@...log.com>, 
 Michael Hennerich <michael.hennerich@...log.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Andy Shevchenko <andy@...nel.org>
Cc: Sean Anderson <sean.anderson@...ux.dev>, linux-spi@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-iio@...r.kernel.org, David Lechner <dlechner@...libre.com>
Subject: [PATCH v4 8/9] dt-bindings: iio: adc: adi,ad7380: add
 spi-rx-bus-width property

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.

Signed-off-by: David Lechner <dlechner@...libre.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