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Author SHA1 Message Date
Marek Vasut
bd48b5a4e8 dt-bindings: hwmon: pwm-fan: Document after shutdown fan settings 
Document fan-shutdown-percent property, used to describe fan RPM in percent
set during shutdown. This is used to keep the fan running at fixed RPM after
the kernel shut down, which is useful on hardware that does keep heating
itself even after the kernel did shut down, for example from some sort of
management core.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20250904202157.170600-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
 2025-09-07 16:33:48 -07:00
Marek Vasut
80bc64201e dt-bindings: hwmon: pwm-fan: Document start from stopped state properties 
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>
Message-ID: <20241106185925.223736-1-marex@denx.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
 2024-11-12 13:54:55 -08:00
Cristian Ciocaltea
9e51acc4db dt-bindings: hwmon: pwm-fan: Convert to DT schema 
Convert the PWM fan bindings to DT schema format.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230406182000.956275-2-cristian.ciocaltea@collabora.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
 2023-04-19 07:08:39 -07:00