5 * Maxim MAX31785, MAX31785A
6 Prefix: 'max31785' or 'max31785a'
8 Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf
10 Author: Andrew Jeffery <andrew@aj.id.au>
15 The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan
16 management with temperature and remote voltage sensing. Various fan control
17 features are provided, including PWM frequency control, temperature hysteresis,
18 dual tachometer measurements, and fan health monitoring.
20 For dual-rotor configurations the MAX31785A exposes the second rotor tachometer
21 readings in attributes fan[5-8]_input. By contrast the MAX31785 only exposes
22 the slowest rotor measurement, and does so in the fan[1-4]_input attributes.
27 This driver does not probe for PMBus devices. You will have to instantiate
33 fan[1-4]_alarm Fan alarm.
34 fan[1-4]_fault Fan fault.
35 fan[1-8]_input Fan RPM. On the MAX31785A, inputs 5-8 correspond to the
36 second rotor of fans 1-4
37 fan[1-4]_target Fan input target
39 in[1-6]_crit Critical maximum output voltage
40 in[1-6]_crit_alarm Output voltage critical high alarm
41 in[1-6]_input Measured output voltage
42 in[1-6]_label "vout[18-23]"
43 in[1-6]_lcrit Critical minimum output voltage
44 in[1-6]_lcrit_alarm Output voltage critical low alarm
45 in[1-6]_max Maximum output voltage
46 in[1-6]_max_alarm Output voltage high alarm
47 in[1-6]_min Minimum output voltage
48 in[1-6]_min_alarm Output voltage low alarm
50 pwm[1-4] Fan target duty cycle (0..255)
51 pwm[1-4]_enable 0: Full-speed
53 2: Automatic PWM (tach-feedback RPM fan-control)
54 3: Automatic closed-loop (temp-feedback fan-control)
56 temp[1-11]_crit Critical high temperature
57 temp[1-11]_crit_alarm Chip temperature critical high alarm
58 temp[1-11]_input Measured temperature
59 temp[1-11]_max Maximum temperature
60 temp[1-11]_max_alarm Chip temperature high alarm