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OT: it8728F PWM configuration

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  OT: it8728F PWM configuration Grzesiek Sójka <pld@sojka.co> - 2021-02-28 16:50 +0100

#232207 — OT: it8728F PWM configuration

Hi there,

I'm trying to configure automatic fan speed control. Unfortunately, in 
the it87 kernel module documentation explains only settings of IT8705F 
and IT8712F (these chips do not have slope setting). Could some explain 
how it works:

# grep "" pwm1*
pwm1:70
pwm1_auto_channels_temp:1
pwm1_auto_point1_temp:0
pwm1_auto_point1_temp_hyst:-3000
pwm1_auto_point2_temp:20000
pwm1_auto_point3_temp:50000
pwm1_auto_slope:16
pwm1_auto_start:70
pwm1_enable:2
pwm1_freq:23437

I know what pwm1_auto_channels_temp, pwm1_enable, pwm1_freq mean. What 
about the others? In particular, how the PWN value would be calculated 
for 40deg.

Thanks in advance for any help
Greg

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