[PATCH v2 00/23] counter: cleanups and device lifetime fixes

[Lars-Peter Clausen]

On 12/27/21 10:45 AM, Uwe Kleine-König wrote:
> [...]
>
>   - I wonder why counter is a bus and not a class device type. There is
>     no driver that would ever bind a counter device, is there? So
>     /sys/bus/counter/driver is always empty.
>
There used to be a time when GKH said that we do not want new driver 
classes. And all new subsystems should use bus since bus is a superset 
of class. This restriction has been eased since then.

But it was around when the IIO subsystem was merged and since the 
counter subsystem originated from the IIO subsystem I assume it just 
copied this.