On 6/17/25 9:49 AM, Uwe Kleine-König wrote:
Hello Marek,
Hi,
On Tue, Jun 17, 2025 at 02:28:01AM +0200, Marek Vasut wrote:
Document trivial PWM on Argon40 Fan HAT, which is a RaspberryPi
blower fan hat which can be controlled over I2C.
Signed-off-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxxxx>
---
Cc: "Uwe Kleine-König" <ukleinek@xxxxxxxxxx>
Cc: Conor Dooley <conor+dt@xxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-pwm@xxxxxxxxxxxxxxx
Cc: linux-renesas-soc@xxxxxxxxxxxxxxx
---
V2: Implement dedicated binding document
---
.../bindings/pwm/argon40,fan-hat.yaml | 47 +++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pwm/argon40,fan-hat.yaml
diff --git a/Documentation/devicetree/bindings/pwm/argon40,fan-hat.yaml b/Documentation/devicetree/bindings/pwm/argon40,fan-hat.yaml
new file mode 100644
index 000000000000..2725eee5328c
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/argon40,fan-hat.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/argon40,fan-hat.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Argon40 Fan HAT PWM controller
+
+maintainers:
+ - Marek Vasut <marek.vasut+renesas@xxxxxxxxxxx>
+
+description: |
+ The trivial PWM on Argon40 Fan HAT, which is a RaspberryPi blower fan
+ hat which can be controlled over I2C, generates a fixed duty cycle PWM
+ signal with configurable period to control the fan speed.
Did you get that right? I would have expected a fixed period and the
parameter modifying the duty cycle?
I actually found a fixed 30 kHz period PWM at the underside of the
device, it wasn't easy to reach. Expect a V3.
