[iwl-next,v2,3/3] ice: add ice driver PTP pin documentation

Commit Message

Arkadiusz Kubalewski Feb. 14, 2025, 2:18 p.m. UTC

From: Karol Kolacinski <[e-mail]>

Add a description of PTP pins support by the adapters to ice driver
documentation.

Signed-off-by: Karol Kolacinski <[e-mail]>
---
v2:
- no change, updated series
---
 .../device_drivers/ethernet/intel/ice.rst           | 13 +++++++++++++
 1 file changed, 13 insertions(+)

Patch

diff --git a/Documentation/networking/device_drivers/ethernet/intel/ice.rst b/Documentation/networking/device_drivers/ethernet/intel/ice.rst
index 3c46a48d99ba..0bca293cf9cb 100644
--- a/Documentation/networking/device_drivers/ethernet/intel/ice.rst
+++ b/Documentation/networking/device_drivers/ethernet/intel/ice.rst
@@ -927,6 +927,19 @@  To enable/disable UDP Segmentation Offload, issue the following command::
 
   # ethtool -K <ethX> tx-udp-segmentation [off|on]
 
+PTP pin interface
+-----------------
+All adapters support standard PTP pin interface. SDPs (Software Definable Pin)
+are single ended pins with both periodic output and external timestamp
+supported. There are also specific differential input/output pins (TIME_SYNC,
+1PPS) with only one of the functions supported.
+
+There are adapters with DPLL, where pins are connected to the DPLL instead of
+being exposed on the board. You have to be aware that in those configurations,
+only SDP pins are exposed and each pin has its own fixed direction.
+To see input signal on those PTP pins, you need to configure DPLL properly.
+Output signal is only visible on DPLL and to send it to the board SMA/U.FL pins,
+DPLL output pins have to be manually configured.
 
 GNSS module
 -----------