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-rw-r--r--drivers/ptp/Kconfig10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index cd9bc3b129bc..5648dad71fb3 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -78,9 +78,13 @@ config PTP_1588_CLOCK_PCH
depends on PCH_GBE
help
This driver adds support for using the PCH EG20T 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.
+ 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.