Re: [PATCH v4 1/2] dt-bindings: hwmon: emc2305: Add fan-shutdown-percent property

[Rob Herring]

On Fri, Mar 20, 2026 at 05:29:58PM +0200, florin.leotescu@xxxxxxxxxxx wrote:
> From: Florin Leotescu <florin.leotescu@xxxxxxx>
> 
> 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 shutdown fan speed to be configured per fan output.

Why not a common fan property in fan-common.yaml?

We generally specify fan speeds in RPM (and then map RPMs to duty cycle 
for PWM).

Also, we have (or can have) cooling levels defined. Perhaps we should 
define the cooling level for shutdown? Maybe other things with cooling 
levels need a shutdown level too?

Rob