net: dsa: mt7530: populate supported_interfaces and mac_capabilities

Populate the supported interfaces and MAC capabilities for mt7530,
mt7531 and mt7621 DSA switches. Filling this in will enable phylink
to pre-check the PHY interface mode against the the supported
interfaces bitmap prior to calling the validate function, and will
eventually allow us to convert to using the generic validation.
Tested-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/dsa/mt7530.c

@@ -2389,6 +2389,32 @@ mt7531_setup(struct dsa_switch *ds)
 	return 0;
 }
 
+static void mt7530_mac_port_get_caps(struct dsa_switch *ds, int port,
+				     struct phylink_config *config)
+{
+	switch (port) {
+	case 0 ... 4: /* Internal phy */
+		__set_bit(PHY_INTERFACE_MODE_GMII,
+			  config->supported_interfaces);
+		break;
+
+	case 5: /* 2nd cpu port with phy of port 0 or 4 / external phy */
+		phy_interface_set_rgmii(config->supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_MII,
+			  config->supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_GMII,
+			  config->supported_interfaces);
+		break;
+
+	case 6: /* 1st cpu port */
+		__set_bit(PHY_INTERFACE_MODE_RGMII,
+			  config->supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_TRGMII,
+			  config->supported_interfaces);
+		break;
+	}
+}
+
 static bool
 mt7530_phy_mode_supported(struct dsa_switch *ds, int port,
 			  const struct phylink_link_state *state)
@@ -2425,6 +2451,37 @@ static bool mt7531_is_rgmii_port(struct mt7530_priv *priv, u32 port)
 	return (port == 5) && (priv->p5_intf_sel != P5_INTF_SEL_GMAC5_SGMII);
 }
 
+static void mt7531_mac_port_get_caps(struct dsa_switch *ds, int port,
+				     struct phylink_config *config)
+{
+	struct mt7530_priv *priv = ds->priv;
+
+	switch (port) {
+	case 0 ... 4: /* Internal phy */
+		__set_bit(PHY_INTERFACE_MODE_GMII,
+			  config->supported_interfaces);
+		break;
+
+	case 5: /* 2nd cpu port supports either rgmii or sgmii/8023z */
+		if (mt7531_is_rgmii_port(priv, port)) {
+			phy_interface_set_rgmii(config->supported_interfaces);
+			break;
+		}
+		fallthrough;
+
+	case 6: /* 1st cpu port supports sgmii/8023z only */
+		__set_bit(PHY_INTERFACE_MODE_SGMII,
+			  config->supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_1000BASEX,
+			  config->supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_2500BASEX,
+			  config->supported_interfaces);
+
+		config->mac_capabilities |= MAC_2500FD;
+		break;
+	}
+}
+
 static bool
 mt7531_phy_mode_supported(struct dsa_switch *ds, int port,
 			  const struct phylink_link_state *state)
@@ -2903,6 +2960,18 @@ mt7531_cpu_port_config(struct dsa_switch *ds, int port)
 	return 0;
 }
 
+static void mt753x_phylink_get_caps(struct dsa_switch *ds, int port,
+				    struct phylink_config *config)
+{
+	struct mt7530_priv *priv = ds->priv;
+
+	/* This switch only supports full-duplex at 1Gbps */
+	config->mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
+				   MAC_10 | MAC_100 | MAC_1000FD;
+
+	priv->info->mac_port_get_caps(ds, port, config);
+}
+
 static void
 mt7530_mac_port_validate(struct dsa_switch *ds, int port,
 			 unsigned long *supported)
@@ -3138,6 +3207,7 @@ static const struct dsa_switch_ops mt7530_switch_ops = {
 	.port_vlan_del		= mt7530_port_vlan_del,
 	.port_mirror_add	= mt753x_port_mirror_add,
 	.port_mirror_del	= mt753x_port_mirror_del,
+	.phylink_get_caps	= mt753x_phylink_get_caps,
 	.phylink_validate	= mt753x_phylink_validate,
 	.phylink_mac_link_state	= mt753x_phylink_mac_link_state,
 	.phylink_mac_config	= mt753x_phylink_mac_config,
@@ -3155,6 +3225,7 @@ static const struct mt753x_info mt753x_table[] = {
 		.phy_read = mt7530_phy_read,
 		.phy_write = mt7530_phy_write,
 		.pad_setup = mt7530_pad_clk_setup,
+		.mac_port_get_caps = mt7530_mac_port_get_caps,
 		.phy_mode_supported = mt7530_phy_mode_supported,
 		.mac_port_validate = mt7530_mac_port_validate,
 		.mac_port_get_state = mt7530_phylink_mac_link_state,
@@ -3166,6 +3237,7 @@ static const struct mt753x_info mt753x_table[] = {
 		.phy_read = mt7530_phy_read,
 		.phy_write = mt7530_phy_write,
 		.pad_setup = mt7530_pad_clk_setup,
+		.mac_port_get_caps = mt7530_mac_port_get_caps,
 		.phy_mode_supported = mt7530_phy_mode_supported,
 		.mac_port_validate = mt7530_mac_port_validate,
 		.mac_port_get_state = mt7530_phylink_mac_link_state,
@@ -3178,6 +3250,7 @@ static const struct mt753x_info mt753x_table[] = {
 		.phy_write = mt7531_ind_phy_write,
 		.pad_setup = mt7531_pad_setup,
 		.cpu_port_config = mt7531_cpu_port_config,
+		.mac_port_get_caps = mt7531_mac_port_get_caps,
 		.phy_mode_supported = mt7531_phy_mode_supported,
 		.mac_port_validate = mt7531_mac_port_validate,
 		.mac_port_get_state = mt7531_phylink_mac_link_state,
@@ -3240,6 +3313,7 @@ mt7530_probe(struct mdio_device *mdiodev)
 	 */
 	if (!priv->info->sw_setup || !priv->info->pad_setup ||
 	    !priv->info->phy_read || !priv->info->phy_write ||
+	    !priv->info->mac_port_get_caps ||
 	    !priv->info->phy_mode_supported ||
 	    !priv->info->mac_port_validate ||
 	    !priv->info->mac_port_get_state || !priv->info->mac_port_config)

drivers/net/dsa/mt7530.h

@@ -769,6 +769,8 @@ struct mt753x_info {
 	int (*phy_write)(struct mt7530_priv *priv, int port, int regnum, u16 val);
 	int (*pad_setup)(struct dsa_switch *ds, phy_interface_t interface);
 	int (*cpu_port_config)(struct dsa_switch *ds, int port);
+	void (*mac_port_get_caps)(struct dsa_switch *ds, int port,
+				  struct phylink_config *config);
 	bool (*phy_mode_supported)(struct dsa_switch *ds, int port,
 				   const struct phylink_link_state *state);
 	void (*mac_port_validate)(struct dsa_switch *ds, int port,