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dt-bindings: hwmon: emc2305: Add fan-shutdown-percent property

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The EMC2305 fan controller supports multiple independent PWM fan
outputs. Some systems require fans to enter a defined safe state
during system shutdown or reboot handoff, until firmware or the next
boot stage reconfigures the controller.

Add an optional "fan-shutdown-percent" property to fan child nodes
allowing the PWM duty cycle applied during shutdown to be configured
per fan output.

Signed-off-by: Florin Leotescu <florin.leotescu@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20260429065955.2113012-3-florin.leotescu@oss.nxp.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Florin Leotescu 2026-04-29 09:59:54 +03:00 committed by Guenter Roeck
parent ee672fef23
commit d37276a86e
1 changed files with 8 additions and 0 deletions
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8
Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
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@ -54,6 +54,12 @@ patternProperties:
The fan number used to determine the associated PWM channel.
maxItems: 1
fan-shutdown-percent:
description:
PWM duty cycle in percent applied to the fan during shutdown.
minimum: 0
maximum: 100
required:
- reg
@ -80,12 +86,14 @@ examples:
fan@0 {
reg = <0x0>;
pwms = <&fan_controller 26000 PWM_POLARITY_INVERTED 1>;
fan-shutdown-percent = <100>;
#cooling-cells = <2>;
};
fan@1 {
reg = <0x1>;
pwms = <&fan_controller 26000 0 1>;
fan-shutdown-percent = <50>;
#cooling-cells = <2>;
};