linux-kernel - [PATCH v6 03/17] dt-bindings: trigger-source: add generic PWM trigger source

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Message-Id: <20241211-dlech-mainline-spi-engine-offload-2-v6-3-88ee574d5d03@baylibre.com>
Date: Wed, 11 Dec 2024 14:54:40 -0600
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>
Cc: Uwe Kleine-König <ukleinek@...nel.org>, 
 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 v6 03/17] dt-bindings: trigger-source: add generic PWM
 trigger source

Add a new binding for using a PWM signal as a trigger source.

The idea here is similar to e.g. "pwm-clock" to allow a trigger source
consumer to use a PWM provider as a trigger source.

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

v6 changes:
* Moved file from bindings/spi/ to bindings/trigger-source/
* Updated description to not mention SPI
* Dropped $ref: /schemas/spi/trigger-source.yaml#
* Swapped order in name to be consistent with "pwm-clock"

v5 changes:
* Add MAINTAINERS entry

v4 changes: new patch in v4
---
 .../bindings/trigger-source/pwm-trigger.yaml       | 37 ++++++++++++++++++++++
 MAINTAINERS                                        |  5 +++
 2 files changed, 42 insertions(+)

diff --git a/Documentation/devicetree/bindings/trigger-source/pwm-trigger.yaml b/Documentation/devicetree/bindings/trigger-source/pwm-trigger.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..1eac20031dc3cf921aafb8aa37f4e4eca1075835
--- /dev/null
+++ b/Documentation/devicetree/bindings/trigger-source/pwm-trigger.yaml
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/trigger-source/pwm-trigger.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic trigger source using PWM
+
+description: Remaps a PWM channel as a trigger source.
+
+maintainers:
+  - David Lechner <dlechner@...libre.com>
+
+properties:
+  compatible:
+    const: pwm-trigger
+
+  '#trigger-source-cells':
+    const: 0
+
+  pwms:
+    maxItems: 1
+
+required:
+  - compatible
+  - '#trigger-source-cells'
+  - pwms
+
+additionalProperties: false
+
+examples:
+  - |
+    trigger {
+        compatible = "pwm-trigger";
+        #trigger-source-cells = <0>;
+        pwms = <&pwm 0 1000000 0>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 9284a257607a740ab7f6fd960c2bcdc34ead7586..b2aa6f37743e48353c60e5973ea8126590c7f6d5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23879,6 +23879,11 @@ 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 - PWM
+M:	David Lechner <dlechner@...libre.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/trigger-source/pwm-trigger.yaml
+
 TRUSTED SECURITY MODULE (TSM) ATTESTATION REPORTS
 M:	Dan Williams <dan.j.williams@...el.com>
 L:	linux-coco@...ts.linux.dev

-- 
2.43.0