meta-openembedded/meta-oe/recipes-extended/linuxconsole/linuxconsole/inputattach.service

[Unit]
Description=Attach serial input devices to kernel input subsystem
After=syslog.target

[Service]
Type=forking
ExecStart=/usr/bin/inputattachctl start
ExecStop=/usr/bin/inputattachctl stop

[Install]
WantedBy=multi-user.target