net: stmmac: Only update the auto-discovered PTP clock features

Some DWMAC variants such as dwmac1000 don't support discovering the
number of output pps and auxiliary snapshots. Allow these parameters to
be defined in default ptp_clock_info, and let them be updated only when
the feature discovery yielded a result.

Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20241112170658.2388529-4-maxime.chevallier@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
index 41581f5..8ea2b42 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
@@ -303,8 +303,14 @@ void stmmac_ptp_register(struct stmmac_priv *priv)
        if (priv->plat->has_gmac4 && priv->plat->clk_ptp_rate)
                priv->plat->cdc_error_adj = (2 * NSEC_PER_SEC) / priv->plat->clk_ptp_rate;
 
-       priv->ptp_clock_ops.n_per_out = priv->dma_cap.pps_out_num;
-       priv->ptp_clock_ops.n_ext_ts = priv->dma_cap.aux_snapshot_n;
+       /* Update the ptp clock parameters based on feature discovery, when
+        * available
+        */
+       if (priv->dma_cap.pps_out_num)
+               priv->ptp_clock_ops.n_per_out = priv->dma_cap.pps_out_num;
+
+       if (priv->dma_cap.aux_snapshot_n)
+               priv->ptp_clock_ops.n_ext_ts = priv->dma_cap.aux_snapshot_n;
 
        if (priv->plat->ptp_max_adj)
                priv->ptp_clock_ops.max_adj = priv->plat->ptp_max_adj;