| Message ID | 20241106185925.223736-1-marex@denx.de (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [v3,1/2] dt-bindings: hwmon: pwm-fan: Document start from stopped state properties | expand |
On Wed, Nov 06, 2024 at 07:59:04PM +0100, Marek Vasut wrote: > Delta AFC0612DB-F00 fan has to be set to at least 30% PWM duty cycle > to spin up from a stopped state, and can be afterward throttled down to > lower PWM duty cycle. Introduce support for operating such fans which > need to start at higher PWM duty cycle first and can slow down next. > > Document two new DT properties, "fan-stop-to-start-percent" and > "fan-stop-to-start-usec". The former describes the minimum percent > of fan RPM at which it will surely spin up from stopped state. This > value can be found in the fan datasheet and can be converted to PWM > duty cycle easily. The "fan-stop-to-start-usec" describes the minimum > time in microseconds for which the fan has to be set to stopped state > start RPM for the fan to surely spin up. > > Signed-off-by: Marek Vasut <marex@denx.de> Acked-by: Conor Dooley <conor.dooley@microchip.com>
On Wed, Nov 06, 2024 at 07:59:04PM +0100, Marek Vasut wrote: > Delta AFC0612DB-F00 fan has to be set to at least 30% PWM duty cycle > to spin up from a stopped state, and can be afterward throttled down to > lower PWM duty cycle. Introduce support for operating such fans which > need to start at higher PWM duty cycle first and can slow down next. > > Document two new DT properties, "fan-stop-to-start-percent" and > "fan-stop-to-start-usec". The former describes the minimum percent > of fan RPM at which it will surely spin up from stopped state. This > value can be found in the fan datasheet and can be converted to PWM > duty cycle easily. The "fan-stop-to-start-usec" describes the minimum > time in microseconds for which the fan has to be set to stopped state > start RPM for the fan to surely spin up. > > Signed-off-by: Marek Vasut <marex@denx.de> > Acked-by: Conor Dooley <conor.dooley@microchip.com> Applied. Thanks, Guenter
diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.yaml b/Documentation/devicetree/bindings/hwmon/pwm-fan.yaml index 4e5abf7580cc6..8b4ed5ee962fb 100644 --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.yaml +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.yaml @@ -31,6 +31,16 @@ properties: it must be self resetting edge interrupts. maxItems: 1 + fan-stop-to-start-percent: + description: + Minimum fan RPM in percent to start when stopped. + minimum: 0 + maximum: 100 + + fan-stop-to-start-us: + description: + Time to wait in microseconds after start when stopped. + pulses-per-revolution: description: Define the number of pulses per fan revolution for each tachometer
Delta AFC0612DB-F00 fan has to be set to at least 30% PWM duty cycle to spin up from a stopped state, and can be afterward throttled down to lower PWM duty cycle. Introduce support for operating such fans which need to start at higher PWM duty cycle first and can slow down next. Document two new DT properties, "fan-stop-to-start-percent" and "fan-stop-to-start-usec". The former describes the minimum percent of fan RPM at which it will surely spin up from stopped state. This value can be found in the fan datasheet and can be converted to PWM duty cycle easily. The "fan-stop-to-start-usec" describes the minimum time in microseconds for which the fan has to be set to stopped state start RPM for the fan to surely spin up. Signed-off-by: Marek Vasut <marex@denx.de> --- Cc: Conor Dooley <conor+dt@kernel.org> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Jean Delvare <jdelvare@suse.com> Cc: Krzysztof Kozlowski <krzk+dt@kernel.org> Cc: Rob Herring <robh@kernel.org> Cc: devicetree@vger.kernel.org Cc: linux-hwmon@vger.kernel.org --- V2: - Rename fan-dead-stop-start-percent to fan-stop-to-start-percent - Rename fan-dead-stop-start-usec to fan-stop-to-start-us V3: - Drop ref: /schemas/types.yaml#/definitions/uint32 from fan-stop-to-start-us --- Documentation/devicetree/bindings/hwmon/pwm-fan.yaml | 10 ++++++++++ 1 file changed, 10 insertions(+)