linux-kernel - [PATCH 6/9] dt-bindings: trigger-source: add ADI Util Sigma-Delta SPI

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Message-Id: <20250620-iio-adc-ad7173-add-spi-offload-support-v1-6-0766f6297430@baylibre.com>
Date: Fri, 20 Jun 2025 17:20:12 -0500
From: David Lechner <dlechner@...libre.com>
To: Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Mark Brown <broonie@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-spi@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH 6/9] dt-bindings: trigger-source: add ADI Util Sigma-Delta
 SPI

Add new binding for the ADI Util Sigma-Delta SPI FPGA IP Core.

This is used to trigger a SPI offload based on a RDY signal from the
ADC while masking out other signals on the same line.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 .../trigger-source/adi,util-sigma-delta-spi.yaml   | 49 ++++++++++++++++++++++
 MAINTAINERS                                        |  5 +++
 2 files changed, 54 insertions(+)

diff --git a/Documentation/devicetree/bindings/trigger-source/adi,util-sigma-delta-spi.yaml b/Documentation/devicetree/bindings/trigger-source/adi,util-sigma-delta-spi.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..ea466179551cb0d8f8e1cf01f91101b88734da88
--- /dev/null
+++ b/Documentation/devicetree/bindings/trigger-source/adi,util-sigma-delta-spi.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2025 Analog Devices, Inc.
+# Copyright (c) 2025 BayLibre, SAS
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/trigger-source/adi,util-sigma-delta-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices Util Sigma-Delta SPI IP Core
+
+maintainers:
+  - David Lechner <dlechner@...libre.com>
+
+description:
+  The Util Sigma-Delta SPI is an FPGA IP core from Analog Devices that provides
+  a SPI offload trigger from the RDY signal of the combined DOUT/RDY pin of
+  the sigma-delta family of ADCs.
+  https://analogdevicesinc.github.io/hdl/library/util_sigma_delta_spi/index.html
+
+properties:
+  compatible:
+    const: adi,util-sigma-delta-spi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  '#trigger-source-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - '#trigger-source-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    trigger@...00 {
+        reg = <0x40000 0x1000>;
+        compatible = "adi,util-sigma-delta-spi";
+        clocks = <&clk 0>;
+        #trigger-source-cells = <0>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index ea082c6be8acd5081d95bbada99ae47793f206e5..60ba572be7f5b48c0ab1d0d9724e19e335e8761b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25176,6 +25176,11 @@ W:	https://github.com/srcres258/linux-doc
 T:	git git://github.com/srcres258/linux-doc.git doc-zh-tw
 F:	Documentation/translations/zh_TW/
 
+TRIGGER SOURCE - ADI UTIL SIGMA DELTA SPI
+M:	David Lechner <dlechner@...libre.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/trigger-source/adi,util-sigma-delta-spi.yaml
+
 TRIGGER SOURCE - PWM
 M:	David Lechner <dlechner@...libre.com>
 S:	Maintained

-- 
2.43.0