net: stmmac: add new switch to struct plat_stmmacenet_data

On some platforms, the PCS can be integrated in the MAC so the driver
will not see any PCS link activity. Add a switch that allows the platform
drivers to let the core code know.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -5798,7 +5798,7 @@ static void stmmac_common_interrupt(struct stmmac_priv *priv)
 		}
 
 		/* PCS link status */
-		if (priv->hw->pcs) {
+		if (priv->hw->pcs && !priv->plat->has_integrated_pcs) {
 			if (priv->xstats.pcs_link)
 				netif_carrier_on(priv->dev);
 			else

include/linux/stmmac.h

@@ -293,5 +293,6 @@ struct plat_stmmacenet_data {
 	bool sph_disable;
 	bool serdes_up_after_phy_linkup;
 	const struct dwmac4_addrs *dwmac4_addrs;
+	bool has_integrated_pcs;
 };
 #endif