Search notes:

/sys/class

/sys/class contains representations of every device class that is registered with the kernel.

Subdirectories

Subdirectories I've found under /sys/class include

`bdi`
`block`
`bsg`
`cuse`
`devlink`
`drm`
`graphics`
`input`
`iommu`
`ipvtap`
`macvtap`
`mem`
`misc`
`nd`
`net`
`pci_bus`
`phy`
`power_supply`
`ppp`
`pps`
`ptp`
`rtc`
`scsi_device`
`scsi_disk`
`scsi_generic`
`scsi_host`
`thermal`
`tty`
`uio`
`vc`
`vfio`
`virtio-ports`
`vtconsole`

See also

The parent directory /sys