1 Kernel driver mlxreg-fan
2 ========================
3
4 Provides FAN control for the next Mellanox sys
5
6 - QMB700, equipped with 40x200GbE InfiniBand p
7 - MSN3700, equipped with 32x200GbE or 16x400Gb
8 - MSN3410, equipped with 6x400GbE plus 48x50Gb
9 - MSN3800, equipped with 64x1000GbE Ethernet p
10
11 Author: Vadim Pasternak <vadimp@mellanox.com>
12
13 These are the Top of the Rack systems, equippe
14 board with Mellanox Quantum or Spectrume-2 dev
15 FAN controller is implemented by the programma
16
17 The default registers offsets set within the p
18 following:
19
20 ======================= ====
21 pwm1 0xe3
22 fan1 (tacho1) 0xe4
23 fan2 (tacho2) 0xe5
24 fan3 (tacho3) 0xe6
25 fan4 (tacho4) 0xe7
26 fan5 (tacho5) 0xe8
27 fan6 (tacho6) 0xe9
28 fan7 (tacho7) 0xea
29 fan8 (tacho8) 0xeb
30 fan9 (tacho9) 0xec
31 fan10 (tacho10) 0xed
32 fan11 (tacho11) 0xee
33 fan12 (tacho12) 0xef
34 ======================= ====
35
36 This setup can be re-programmed with other reg
37
38 Description
39 -----------
40
41 The driver implements a simple interface for d
42 a PWM output and tachometer inputs.
43 This driver obtains PWM and tachometers regist
44 the system configuration and creates FAN/PWM h
45 device. PWM and tachometers are sensed through
46 device, which exports its register map. This d
47 any bus type, for which register mapping is su
48 Single instance is created with one PWM contro
49 one cooling device. It could be as many instan
50 supports.
51 The driver exposes the fan to the user space t
52 thermal's sysfs interfaces.
53
54 /sys files in hwmon subsystem
55 -----------------------------
56
57 ================= == =========================
58 fan[1-12]_fault RO files for tachometers TAC
59 fan[1-12]_input RO files for tachometers TAC
60 pwm1 RW file for fan[1-12] target
61 ================= == =========================
62
63 /sys files in thermal subsystem
64 -------------------------------
65
66 ================= == =========================
67 cur_state RW file for current cooling
68 (0..max_state)
69 max_state RO file for maximum cooling
70 ================= == =========================
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