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hwmon: (pwm-fan) Refactor fan power on/off

David Marlin requested to merge dmarlin/centos-stream-9:orin-fan-v0 into main

Summary of Changes

Enable fan on Orin systems to prevent overheating.

Approved Bugzilla Ticket

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2141743

Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm.git

Signed-off-by: David Marlin dmarlin@redhat.com

Scratch Brew build

https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=49482757

Description

NVIDIA Orin system runs very hot because the fan does not turn on. Without a working fan we are unable to use these systems in our lab. This set of patches enables the fan on the Orin systems, and allows control through /sys/devices/platform/pwm-fan/hwmon/hwmon0/pwm1.

Edited by David Marlin

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