buildroot/board/globalscale/espressobin/linux-extras.config

#
# The Espressobin has a switchcore with full support in the kernel.
# This fragment enables DSA and its drivers, inclding VLAN aware bridge
# support to allow users to easily set up a LAN switch + WAN interface.
#
CONFIG_NET_DSA=m
CONFIG_VLAN_8021Q=y

CONFIG_BRIDGE=m
CONFIG_BRIDGE_IGMP_SNOOPING=y
CONFIG_BRIDGE_VLAN_FILTERING=y

CONFIG_NET_DSA_MV88E6XXX=m
CONFIG_NET_DSA_MV88E6XXX_PTP=y