linux-kernel - [PATCH 5/6] dt-bindings: iio: adc: adi,ad7380: add spi-buses property

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Message-Id: <20251014-spi-add-multi-bus-support-v1-5-2098c12d6f5f@baylibre.com>
Date: Tue, 14 Oct 2025 17:02:15 -0500
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 5/6] dt-bindings: iio: adc: adi,ad7380: add spi-buses
 property

Add spi-buses 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>
---
 .../devicetree/bindings/iio/adc/adi,ad7380.yaml    | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
index 8dae89ecb64d723dcf2b4af1e0505fc5db49595b..78002bdaa795800a3927570d639e7f8eda9206c2 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
@@ -63,6 +63,10 @@ properties:
   spi-cpol: true
   spi-cpha: true
 
+  spi-buses:
+    minItems: 1
+    maxItems: 4
+
   vcc-supply:
     description: A 3V to 3.6V supply that powers the chip.
 
@@ -246,6 +250,22 @@ allOf:
       patternProperties:
         "^channel@[0-3]$": false
 
+  # 2-channel chip can only have up to 2 buses
+  - if:
+      properties:
+        compatible:
+          enum:
+            - adi,ad7380
+            - adi,ad7381
+            - adi,ad7386
+            - adi,ad7387
+            - adi,ad7388
+            - adi,ad7389
+    then:
+      properties:
+        spi-buses:
+          maxItems: 2
+
 examples:
   - |
     #include <dt-bindings/interrupt-controller/irq.h>
@@ -261,6 +281,7 @@ examples:
             spi-cpol;
             spi-cpha;
             spi-max-frequency = <80000000>;
+            spi-buses = <0>, <1>;
 
             interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
             interrupt-parent = <&gpio0>;
@@ -285,6 +306,7 @@ examples:
             spi-cpol;
             spi-cpha;
             spi-max-frequency = <80000000>;
+            spi-buses = <0>, <1>, <2>, <3>;
 
             interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
             interrupt-parent = <&gpio0>;

-- 
2.43.0