linux-kernel - [PATCH 11/13] dt-bindings: iio: offload: add binding for PWM/DMA triggered buffer

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Date: Wed, 10 Jan 2024 13:49:52 -0600
From: David Lechner <dlechner@...libre.com>
To: Mark Brown <broonie@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Frank Rowand <frowand.list@...il.com>
Cc: David Lechner <dlechner@...libre.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	linux-spi@...r.kernel.org,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 11/13] dt-bindings: iio: offload: add binding for PWM/DMA triggered buffer

This adds a new binding for a PWM trigger and DMA data output connected
to an SPI controller offload instance.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 .../adi,spi-offload-pwm-trigger-dma-buffer.yaml    | 59 ++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/offload/adi,spi-offload-pwm-trigger-dma-buffer.yaml b/Documentation/devicetree/bindings/iio/offload/adi,spi-offload-pwm-trigger-dma-buffer.yaml
new file mode 100644
index 000000000000..748cfab19eff
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/offload/adi,spi-offload-pwm-trigger-dma-buffer.yaml
@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/offload/adi,spi-offload-pwm-trigger-dma-buffer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SPI Offload with PWM Trigger and DMA Buffer Data Output
+
+maintainers:
+  - Michael Hennerich <Michael.Hennerich@...log.com>
+  - Nuno Sá <nuno.sa@...log.com>
+
+description: |
+  This binding describes the connection of a PWM device to the trigger input
+  and a DMA channel to the output data stream of a SPI Offload instance.
+
+  https://wiki.analog.com/resources/fpga/peripherals/spi_engine/offload
+  https://wiki.analog.com/resources/fpga/peripherals/spi_engine/tutorial
+
+$ref: /schemas/spi/adi,axi-spi-engine.yaml#/$defs/offload
+
+properties:
+  compatible:
+    const: adi,spi-offload-pwm-trigger-dma-buffer
+
+  reg:
+    maxItems: 1
+
+  pwms:
+    maxItems: 1
+
+  dmas:
+    maxItems: 1
+
+required:
+  - compatible
+  - pwms
+  - dmas
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        offloads {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            offload@0 {
+                compatible = "adi,spi-offload-pwm-trigger-dma-buffer";
+                reg = <0>;
+                pwms = <&pwm 0>;
+                dmas = <&dma 0>;
+            };
+        };
+    };

-- 
2.43.0