linux-kernel - [PATCH v5 1/2] dt-bindings: pwm: Document clk based PWM controller

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Date:   Sat, 12 Feb 2022 21:23:41 +0500
From:   Nikita Travkin <nikita@...n.ru>
To:     thierry.reding@...il.com, lee.jones@...aro.org
Cc:     u.kleine-koenig@...gutronix.de, robh+dt@...nel.org,
        sboyd@...nel.org, krzk@...nel.org, linus.walleij@...aro.org,
        masneyb@...tation.org, sean.anderson@...o.com,
        linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Nikita Travkin <nikita@...n.ru>
Subject: [PATCH v5 1/2] dt-bindings: pwm: Document clk based PWM controller

Add YAML devicetree binding for clk based PWM controller

Signed-off-by: Nikita Travkin <nikita@...n.ru>
--
Changes in v2:
 - fix the file name.
Changes in v4:
 - Use generic node name in the dt bindings example.
Changes in v5:
 - make compatible required
---
 .../devicetree/bindings/pwm/clk-pwm.yaml      | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/clk-pwm.yaml

diff --git a/Documentation/devicetree/bindings/pwm/clk-pwm.yaml b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml
new file mode 100644
index 000000000000..ec1768291503
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/clk-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Clock based PWM controller
+
+maintainers:
+  - Nikita Travkin <nikita@...n.ru>
+
+description: |
+  Some systems have clocks that can be exposed to external devices.
+  (e.g. by muxing them to GPIO pins)
+  It's often possible to control duty-cycle of such clocks which makes them
+  suitable for generating PWM signal.
+
+allOf:
+  - $ref: pwm.yaml#
+
+properties:
+  compatible:
+    const: clk-pwm
+
+  clocks:
+    description: Clock used to generate the signal.
+    maxItems: 1
+
+  "#pwm-cells":
+    const: 2
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - clocks
+
+examples:
+  - |
+    pwm {
+      compatible = "clk-pwm";
+      #pwm-cells = <2>;
+      clocks = <&gcc 0>;
+      pinctrl-names = "default";
+      pinctrl-0 = <&pwm_clk_flash_default>;
+    };
-- 
2.34.1