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Some platforms require fans to transition to a predefined safe state during shutdown or reboot handoff until firmware or the next boot stage reconfigures the controller. The new optional Device Tree property "fan-shutdown-percent" allows the shutdown PWM duty cycle to be configured per fan output. Thanks for the review and apologies for the delay. Changes in v7: - Use the DT "reg" property when registering thermal cooling devices instead of a sequential child index - Validate the "reg" value against the number of available PWM channels in both DT parsing and probe paths - Address feedback from Guenter Roeck regarding channel index handling Changes in v6: - Split fan channel index validation into a separate patch. Validate fan channel index agains the number of available channels. - Refine dt-binding commit message to refer to PWM duty cycle instead of fan speed. Changes in v5: - Add fan channel index bound check after reg property read to prevent out-of-bounds access. - Refine fan-shutdown-percent description. Changes in v4: - Initialize pwm_shudown array to EMC2305_PWM_SHUTDOWN_UNSET in probe, to avoid treating unconfigured channels as valid and written 0 during shutdown Changes in v3: - Rebased on current upstream - Dropped already upstreamed of_node_put(child) fix Changes in v2: - Address feedback from Guenter Roeck - Make shutdown behavior configurable via Device Tree - Add optional fan-shutdown-percent property - Apply shutdown PWM only for channels defining the property Florin Leotescu (3): hwmon: emc2305: Fix fan channel index handling dt-bindings: hwmon: emc2305: Add fan-shutdown-percent property hwmon: emc2305: Support configurable fan PWM at shutdown .../bindings/hwmon/microchip,emc2305.yaml | 8 +++ drivers/hwmon/emc2305.c | 54 +++++++++++++++++-- 2 files changed, 59 insertions(+), 3 deletions(-) -- 2.34.1