linux-kernel - [PATCH v4 6/9] spi: dt-bindings: adi,axi-spi-engine: add multi-lane support

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Message-Id: <20251219-spi-add-multi-bus-support-v4-6-145dc5204cd8@baylibre.com>
Date: Fri, 19 Dec 2025 15:32:14 -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 6/9] spi: dt-bindings: adi,axi-spi-engine: add
 multi-lane support

Extend the ADI AXI SPI engine binding for multiple data lanes. This SPI
controller has a capability to read multiple data words at the same
time (e.g. for use with simultaneous sampling ADCs). The current FPGA
implementation can support up to 8 data lanes at a time (depending on a
compile-time configuration option).

Signed-off-by: David Lechner <dlechner@...libre.com>
---
v4 changes:
- Update to use spi-{tx,rx}-bus-width properties.
---
 .../devicetree/bindings/spi/adi,axi-spi-engine.yaml       | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml b/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
index 4b3828eda6cb..0f2448371f17 100644
--- a/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
+++ b/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
@@ -70,6 +70,21 @@ required:
 
 unevaluatedProperties: false
 
+patternProperties:
+  "^.*@[0-9a-f]+":
+    type: object
+
+    properties:
+      spi-rx-bus-width:
+        maxItems: 8
+        items:
+          enum: [0, 1]
+
+      spi-tx-bus-width:
+        maxItems: 8
+        items:
+          enum: [0, 1]
+
 examples:
   - |
     spi@...00000 {

-- 
2.43.0