There is only little documentation for PTP available on the data sheet [1] (more or less only the register reference). Questions to the Microchip support were seldom answered comprehensively or in reasonable time. So this is more or less the result of reverse engineering. [1] http://ww1.microchip.com/downloads/en/DeviceDoc/KSZ9563R-Data-Sheet-DS00002419D.pdf Changes from RFC --> v2 ------------------------ I think that all open questions regarding the RFC version could be solved. dts: referenced to dsa.yaml dts: changed node name to "switch" in example dts: changed "ports" subnode to "ethernet-ports" ksz_common: support "ethernet-ports" subnode tag_ksz: fix usage of correction field (32 bit ns + 16 bit sub-ns) tag_ksz: use cached PTP header from device's .port_txtstamp function tag_ksz: refactored ksz9477_tstamp_to_clock() tag_ksz: pdelay_req: only subtract 2 bit seconds from the correction field tag_ksz: pdelay_resp: don't move (negative) correction to the egress tail tag ptp_classify: add ptp_onestep_p2p_move_t2_to_correction helper ksz9477_ptp: removed E2E support (as suggested by Vladimir) ksz9477_ptp: removed master/slave sysfs attributes (nacked by Richard) ksz9477_ptp: refactored ksz9477_ptp_port_txtstamp ksz9477_ptp: removed "pulse" attribute kconfig: depend on PTP_1588_CLOCK (instead of "imply")
