net: ag71xx: remove interface checks in ag71xx_mac_validate()

As phylink checks the interface mode against the supported_interfaces
bitmap, we no longer need to validate the interface mode, nor handle
PHY_INTERFACE_MODE_NA in the validation function. Remove these to
simplify the implementation.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/atheros/ag71xx.c

@@ -1028,42 +1028,8 @@ static void ag71xx_mac_validate(struct phylink_config *config,
 			    unsigned long *supported,
 			    struct phylink_link_state *state)
 {
-	struct ag71xx *ag = netdev_priv(to_net_dev(config->dev));
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
 
-	switch (state->interface) {
-	case PHY_INTERFACE_MODE_NA:
-		break;
-	case PHY_INTERFACE_MODE_MII:
-		if ((ag71xx_is(ag, AR9330) && ag->mac_idx == 0) ||
-		    ag71xx_is(ag, AR9340) ||
-		    ag71xx_is(ag, QCA9530) ||
-		    (ag71xx_is(ag, QCA9550) && ag->mac_idx == 1))
-			break;
-		goto unsupported;
-	case PHY_INTERFACE_MODE_GMII:
-		if ((ag71xx_is(ag, AR9330) && ag->mac_idx == 1) ||
-		    (ag71xx_is(ag, AR9340) && ag->mac_idx == 1) ||
-		    (ag71xx_is(ag, QCA9530) && ag->mac_idx == 1))
-			break;
-		goto unsupported;
-	case PHY_INTERFACE_MODE_SGMII:
-		if (ag71xx_is(ag, QCA9550) && ag->mac_idx == 0)
-			break;
-		goto unsupported;
-	case PHY_INTERFACE_MODE_RMII:
-		if (ag71xx_is(ag, AR9340) && ag->mac_idx == 0)
-			break;
-		goto unsupported;
-	case PHY_INTERFACE_MODE_RGMII:
-		if ((ag71xx_is(ag, AR9340) && ag->mac_idx == 0) ||
-		    (ag71xx_is(ag, QCA9550) && ag->mac_idx == 1))
-			break;
-		goto unsupported;
-	default:
-		goto unsupported;
-	}
-
 	phylink_set(mask, MII);
 
 	phylink_set(mask, Pause);
@@ -1074,8 +1040,7 @@ static void ag71xx_mac_validate(struct phylink_config *config,
 	phylink_set(mask, 100baseT_Half);
 	phylink_set(mask, 100baseT_Full);
 
-	if (state->interface == PHY_INTERFACE_MODE_NA ||
-	    state->interface == PHY_INTERFACE_MODE_SGMII ||
+	if (state->interface == PHY_INTERFACE_MODE_SGMII ||
 	    state->interface == PHY_INTERFACE_MODE_RGMII ||
 	    state->interface == PHY_INTERFACE_MODE_GMII) {
 		phylink_set(mask, 1000baseT_Full);
@@ -1084,10 +1049,6 @@ static void ag71xx_mac_validate(struct phylink_config *config,
 
 	linkmode_and(supported, supported, mask);
 	linkmode_and(state->advertising, state->advertising, mask);
-
-	return;
-unsupported:
-	linkmode_zero(supported);
 }
 
 static void ag71xx_mac_pcs_get_state(struct phylink_config *config,