linux-kernel - [PATCH RFC v4 05/15] spi: dt-bindings: add PWM SPI offload trigger

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Message-Id: <20241023-dlech-mainline-spi-engine-offload-2-v4-5-f8125b99f5a1@baylibre.com>
Date: Wed, 23 Oct 2024 15:59:12 -0500
From: David Lechner <dlechner@...libre.com>
To: Mark Brown <broonie@...nel.org>, Jonathan Cameron <jic23@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Uwe Kleine-König <ukleinek@...nel.org>
Cc: Michael Hennerich <Michael.Hennerich@...log.com>, 
 Lars-Peter Clausen <lars@...afoo.de>, David Jander <david@...tonic.nl>, 
 Martin Sperl <kernel@...tin.sperl.org>, linux-spi@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-iio@...r.kernel.org, linux-pwm@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH RFC v4 05/15] spi: dt-bindings: add PWM SPI offload trigger

Add a new binding for using a PWM signal as a trigger for SPI offloads.

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

v4 changes: new patch in v4
---
 .../devicetree/bindings/spi/trigger-pwm.yaml       | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/trigger-pwm.yaml b/Documentation/devicetree/bindings/spi/trigger-pwm.yaml
new file mode 100644
index 000000000000..987638aa4732
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/trigger-pwm.yaml
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/trigger-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic SPI offload trigger using PWM
+
+description: Remaps a PWM channel as a trigger source.
+
+maintainers:
+  - David Lechner <dlechner@...libre.com>
+
+$ref: /schemas/spi/trigger-source.yaml#
+
+properties:
+  compatible:
+    const: trigger-pwm
+
+  '#trigger-source-cells':
+    const: 0
+
+  pwms:
+    maxItems: 1
+
+required:
+  - compatible
+  - '#trigger-source-cells'
+  - pwms
+
+additionalProperties: false
+
+examples:
+  - |
+    trigger {
+        compatible = "trigger-pwm";
+        #trigger-source-cells = <0>;
+        pwms = <&pwm 0 1000000 0>;
+    };

-- 
2.43.0