PTP_1588_CLOCK

PTP clock support

The IEEE 1588 standard defines a method to precisely
synchronize distributed clocks over Ethernet networks. The
standard defines a Precision Time Protocol (PTP), which can
be used to achieve synchronization within a few dozen
microseconds. In addition, with the help of special hardware
time stamping units, it can be possible to achieve
synchronization to within a few hundred nanoseconds.

This driver adds support for PTP clocks as character
devices. If you want to use a PTP clock, then you should
also enable at least one clock driver as well.

To compile this driver as a module, choose M here: the module
will be called ptp.

PTP_1588_CLOCK_GIANFAR

Freescale eTSEC as PTP clock

This driver adds support for using the eTSEC as a PTP
clock. This clock is only useful if your PTP programs are
getting hardware time stamps on the PTP Ethernet packets
using the SO_TIMESTAMPING API.

To compile this driver as a module, choose M here: the module
will be called gianfar_ptp.

PTP_1588_CLOCK_IXP46X

Intel IXP46x as PTP clock

This driver adds support for using the IXP46X as a PTP
clock. This clock is only useful if your PTP programs are
getting hardware time stamps on the PTP Ethernet packets
using the SO_TIMESTAMPING API.

To compile this driver as a module, choose M here: the module
will be called ptp_ixp46x.

Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks.

DP83640_PHY

Driver for the National Semiconductor DP83640 PHYTER

Supports the DP83640 PHYTER with IEEE 1588 features.

This driver adds support for using the DP83640 as a PTP
clock. This clock is only useful if your PTP programs are
getting hardware time stamps on the PTP Ethernet packets
using the SO_TIMESTAMPING API.

In order for this to work, your MAC driver must also
implement the skb_tx_timetamp() function.