1.. SPDX-License-Identifier: GPL-2.0 2 3======================================= 4stmmac (synopsys dwmac) devlink support 5======================================= 6 7This document describes the devlink features implemented by the ``stmmac`` 8device driver. 9 10Parameters 11========== 12 13The ``stmmac`` driver implements the following driver-specific parameters. 14 15.. list-table:: Driver-specific parameters implemented 16 :widths: 5 5 5 85 17 18 * - Name 19 - Type 20 - Mode 21 - Description 22 * - ``ts_coarse`` 23 - Boolean 24 - runtime 25 - Enable the Coarse timestamping mode. In Coarse mode, the ptp clock is 26 expected to be updated through an external PPS input, but the subsecond 27 increment used for timestamping is set to 1/ptp_clock_rate. In Fine mode 28 (i.e. Coarse mode == false), the ptp clock frequency is adjusted more 29 frequently, but the subsecond increment is set to 2/ptp_clock_rate. 30 Coarse mode is suitable for PTP Grand Master operation. If unsure, leave 31 the parameter to False. 32