net: stmmac: provide stmmac_mac_phylink_get_caps()

Allow MACs to provide their own capabilities via the MAC operations
struct.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/E1qZAXT-005pUD-Aj@rmk-PC.armlinux.org.ukSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/hwif.h

@@ -300,6 +300,8 @@ struct stmmac_est;
 struct stmmac_ops {
 	/* MAC core initialization */
 	void (*core_init)(struct mac_device_info *hw, struct net_device *dev);
+	/* Get phylink capabilities */
+	void (*phylink_get_caps)(struct stmmac_priv *priv);
 	/* Enable the MAC RX/TX */
 	void (*set_mac)(void __iomem *ioaddr, bool enable);
 	/* Enable and verify that the IPC module is supported */
@@ -419,6 +421,8 @@ struct stmmac_ops {
 
 #define stmmac_core_init(__priv, __args...) \
 	stmmac_do_void_callback(__priv, mac, core_init, __args)
+#define stmmac_mac_phylink_get_caps(__priv) \
+	stmmac_do_void_callback(__priv, mac, phylink_get_caps, __priv)
 #define stmmac_mac_set(__priv, __args...) \
 	stmmac_do_void_callback(__priv, mac, set_mac, __args)
 #define stmmac_rx_ipc(__priv, __args...) \

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

@@ -1224,6 +1224,9 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
 	priv->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
 		MAC_10 | MAC_100 | MAC_1000;
 
+	/* Get the MAC specific capabilities */
+	stmmac_mac_phylink_get_caps(priv);
+
 	if (priv->plat->has_gmac4) {
 		priv->phylink_config.mac_capabilities |= MAC_2500FD;
 	} else if (priv->plat->has_xgmac) {