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+#
+# PTP clock support configuration
+#
+
+menu "PTP clock support"
+
+config PTP_1588_CLOCK
+ tristate "PTP clock support"
+ depends on NET
+ select PPS
+ select NET_PTP_CLASSIFY
+ help
+ 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.
+
+config PTP_1588_CLOCK_GIANFAR
+ tristate "Freescale eTSEC as PTP clock"
+ depends on GIANFAR
+ select PTP_1588_CLOCK
+ default y
+ help
+ 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.
+
+config PTP_1588_CLOCK_IXP46X
+ tristate "Intel IXP46x as PTP clock"
+ depends on IXP4XX_ETH
+ select PTP_1588_CLOCK
+ default y
+ help
+ 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.
+
+comment "Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks."
+ depends on PHYLIB=n || NETWORK_PHY_TIMESTAMPING=n
+
+config DP83640_PHY
+ tristate "Driver for the National Semiconductor DP83640 PHYTER"
+ depends on NETWORK_PHY_TIMESTAMPING
+ depends on PHYLIB
+ select PTP_1588_CLOCK
+ ---help---
+ 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_timestamp() function.
+
+config PTP_1588_CLOCK_PCH
+ tristate "Intel PCH EG20T as PTP clock"
+ depends on X86_32 || COMPILE_TEST
+ depends on HAS_IOMEM && NET
+ select PTP_1588_CLOCK
+ help
+ This driver adds support for using the PCH EG20T as a PTP
+ clock. The hardware supports time stamping of PTP packets
+ when using the end-to-end delay (E2E) mechansim. The peer
+ delay mechansim (P2P) is not supported.
+
+ 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_pch.
+
+endmenu