On 1/21/22 2:34 AM, Krzysztof Kozlowski wrote:
On Thu, 20 Jan 2022 at 17:15, Nikita Travkin <nikita@xxxxxxx> wrote:
Add YAML devicetree binding for clk based PWM controller
Signed-off-by: Nikita Travkin <nikita@xxxxxxx>
--
Changes in v2:
- fix the file name.
---
.../devicetree/bindings/pwm/clk-pwm.yaml | 45 +++++++++++++++++++
1 file changed, 45 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..4fb2c1baaad4
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml
@@ -0,0 +1,45 @@
+# 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@xxxxxxx>
+
+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:
+ - clocks
+
+examples:
+ - |
+ pwm-flash {
Node names should be generic (see devicetree specification), so just "pwm".
And then what will you do if you have two clock-based pwms?
--Sean
