stmmac (synopsys dwmac) devlink support¶
This document describes the devlink features implemented by the stmmac
device driver.
Parameters¶
The stmmac driver implements the following driver-specific parameters.
Name |
Type |
Mode |
描述 |
|
Boolean |
runtime |
Enable the Coarse timestamping mode, as defined in the DWMAC TRM. A detailed explanation of this timestamping mode can be found in the Socfpga Functionnal Description [1]. In Coarse mode, the ptp clock is expected to be fed by a high-precision clock that is externally adjusted, and the subsecond increment used for timestamping is set to 1/ptp_clock_rate. In Fine mode (i.e. Coarse mode == false), the ptp clock frequency is continuously adjusted, but the subsecond increment is set to 2/ptp_clock_rate. Coarse mode is suitable for PTP Grand Master operation. If unsure, leave the parameter to False. |