Support for the PTP clock on the NXP SJA1105 Ethernet switch

configname: CONFIG_NET_DSA_SJA1105_PTP

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Distributed Switch Architecture drivers
└─>Support for the PTP clock on the NXP SJA1105 Ethernet switch
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This enables support for timestamping and PTP clock manipulations in
the SJA1105 DSA driver.