1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index fcfafd091fd..68d72010229 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -53,4 +53,23 @@ config PTP_1588_CLOCK_IXP46X
           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 PTP_1588_CLOCK && (PHYLIB=n || NETWORK_PHY_TIMESTAMPING=n)
+
+config DP83640_PHY
+        tristate "Driver for the National Semiconductor DP83640 PHYTER"
+        depends on PTP_1588_CLOCK
+        depends on NETWORK_PHY_TIMESTAMPING
+        depends on PHYLIB
+        ---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_timetamp() function.
+
 endmenu