[PATCH net-next v6 6/6] dsa: lan9303: Migrate to PHYLINK

[Jerry Ray <jerry.ray@microchip.com>]

This patch replaces the adjust_link api with the phylink apis that provide
equivalent functionality.

The remaining functionality from the adjust_link is now covered in the
phylink_mac_link_up api.

Removes:
.adjust_link
Adds:
.phylink_get_caps
.phylink_mac_link_up

Signed-off-by: Jerry Ray <jerry.ray@microchip.com>
---
v5->v6:
  - Moved to using port number to identify xMII port for the LAN9303.
v4->v5:
  - Added various prep patches to better show the movement of the logic.
v3->v4:
  - Reworked the implementation to preserve the adjust_link functionality
    by including it in the phylink_mac_link_up api.
v2->v3:
  Added back in disabling Turbo Mode on the CPU MII interface.
  Removed the unnecessary clearing of the phy supported interfaces.
---
 drivers/net/dsa/lan9303-core.c | 101 ++++++++++++++++++++++-----------
 1 file changed, 69 insertions(+), 32 deletions(-)

diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 7be4c491e5d9..e514fff81af6 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -1058,37 +1058,6 @@ static int lan9303_phy_write(struct dsa_switch *ds, int phy, int regnum,
 	return chip->ops->phy_write(chip, phy, regnum, val);
 }
 
-static void lan9303_adjust_link(struct dsa_switch *ds, int port,
-				struct phy_device *phydev)
-{
-	int ctl;
-
-	/* On this device, we are only interested in doing something here if
-	 * this is an xMII port. All other ports are 10/100 phys using MDIO
-	 * to control there link settings.
-	 */
-	if (port != 0)
-		return;
-
-	ctl = lan9303_phy_read(ds, port, MII_BMCR);
-
-	ctl &= ~BMCR_ANENABLE;
-
-	if (phydev->speed == SPEED_100)
-		ctl |= BMCR_SPEED100;
-	else if (phydev->speed == SPEED_10)
-		ctl &= ~BMCR_SPEED100;
-	else
-		dev_err(ds->dev, "unsupported speed: %d\n", phydev->speed);
-
-	if (phydev->duplex == DUPLEX_FULL)
-		ctl |= BMCR_FULLDPLX;
-	else
-		ctl &= ~BMCR_FULLDPLX;
-
-	lan9303_phy_write(ds, port, MII_BMCR, ctl);
-}
-
 static int lan9303_port_enable(struct dsa_switch *ds, int port,
 			       struct phy_device *phy)
 {
@@ -1285,13 +1254,81 @@ static int lan9303_port_mdb_del(struct dsa_switch *ds, int port,
 	return 0;
 }
 
+static void lan9303_phylink_get_caps(struct dsa_switch *ds, int port,
+				     struct phylink_config *config)
+{
+	struct lan9303 *chip = ds->priv;
+
+	dev_dbg(chip->dev, "%s(%d) entered.", __func__, port);
+
+	config->mac_capabilities = MAC_10 | MAC_100 | MAC_ASYM_PAUSE |
+				   MAC_SYM_PAUSE;
+
+	if (port == 0) {
+		__set_bit(PHY_INTERFACE_MODE_RMII,
+			  config->supported_interfaces);
+		__set_bit(PHY_INTERFACE_MODE_MII,
+			  config->supported_interfaces);
+	} else {
+		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
+			  config->supported_interfaces);
+		/* Compatibility for phylib's default interface type when the
+		 * phy-mode property is absent
+		 */
+		__set_bit(PHY_INTERFACE_MODE_GMII,
+			  config->supported_interfaces);
+	}
+
+	/* This driver does not make use of the speed, duplex, pause or the
+	 * advertisement in its mac_config, so it is safe to mark this driver
+	 * as non-legacy.
+	 */
+	config->legacy_pre_march2020 = false;
+}
+
+static void lan9303_phylink_mac_link_up(struct dsa_switch *ds, int port,
+					unsigned int mode,
+					phy_interface_t interface,
+					struct phy_device *phydev, int speed,
+					int duplex, bool tx_pause,
+					bool rx_pause)
+{
+	u32 ctl;
+
+	/* On this device, we are only interested in doing something here if
+	 * this is the xMII port. All other ports are 10/100 phys using MDIO
+	 * to control there link settings.
+	 */
+	if (port != 0)
+		return;
+
+	ctl = lan9303_phy_read(ds, port, MII_BMCR);
+
+	ctl &= ~BMCR_ANENABLE;
+
+	if (speed == SPEED_100)
+		ctl |= BMCR_SPEED100;
+	else if (speed == SPEED_10)
+		ctl &= ~BMCR_SPEED100;
+	else
+		dev_err(ds->dev, "unsupported speed: %d\n", speed);
+
+	if (duplex == DUPLEX_FULL)
+		ctl |= BMCR_FULLDPLX;
+	else
+		ctl &= ~BMCR_FULLDPLX;
+
+	lan9303_phy_write(ds, port, MII_BMCR, ctl);
+}
+
 static const struct dsa_switch_ops lan9303_switch_ops = {
 	.get_tag_protocol	= lan9303_get_tag_protocol,
 	.setup			= lan9303_setup,
 	.get_strings		= lan9303_get_strings,
 	.phy_read		= lan9303_phy_read,
 	.phy_write		= lan9303_phy_write,
-	.adjust_link		= lan9303_adjust_link,
+	.phylink_get_caps	= lan9303_phylink_get_caps,
+	.phylink_mac_link_up	= lan9303_phylink_mac_link_up,
 	.get_ethtool_stats	= lan9303_get_ethtool_stats,
 	.get_sset_count		= lan9303_get_sset_count,
 	.port_enable		= lan9303_port_enable,
-- 
2.17.1