[Macchiato] Fan control

[Duncan]

Hi folks,

The MacchiatoBin has a 4-pin fan header.

This would suggest we could use this for fan control, over I2C (?) or
similar.

However, in the current situation, it is not possible to enable fan
control. The pwmconfig program does not detect it, nor does lm-sensors
find any sensors we could use to detect the current temperature on the
device. I tried the Marvell 4.4.58 kernel, and mainline (4.15-rc2 IIRC).

Does anyone have any thoughts to add?

Best,
Duncan