net: mscc: ocelot: expose serdes configuration function

During chip initialization, ports that use SGMII / QSGMII to interface to
external phys need to be configured on the VSC7513 and VSC7514. Expose this
configuration routine, so it can be used by DSA drivers.

Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 8292e93a3782..1502bb2c8ea7 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -7,6 +7,7 @@
 #include <linux/dsa/ocelot.h>
 #include <linux/if_bridge.h>
 #include <linux/iopoll.h>
+#include <linux/phy/phy.h>
 #include <soc/mscc/ocelot_hsio.h>
 #include <soc/mscc/ocelot_vcap.h>
 #include "ocelot.h"
@@ -809,6 +810,45 @@ static int ocelot_port_flush(struct ocelot *ocelot, int port)
 	return err;
 }
 
+int ocelot_port_configure_serdes(struct ocelot *ocelot, int port,
+				 struct device_node *portnp)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	struct device *dev = ocelot->dev;
+	int err;
+
+	/* Ensure clock signals and speed are set on all QSGMII links */
+	if (ocelot_port->phy_mode == PHY_INTERFACE_MODE_QSGMII)
+		ocelot_port_rmwl(ocelot_port, 0,
+				 DEV_CLOCK_CFG_MAC_TX_RST |
+				 DEV_CLOCK_CFG_MAC_RX_RST,
+				 DEV_CLOCK_CFG);
+
+	if (ocelot_port->phy_mode != PHY_INTERFACE_MODE_INTERNAL) {
+		struct phy *serdes = of_phy_get(portnp, NULL);
+
+		if (IS_ERR(serdes)) {
+			err = PTR_ERR(serdes);
+			dev_err_probe(dev, err,
+				      "missing SerDes phys for port %d\n",
+				      port);
+			return err;
+		}
+
+		err = phy_set_mode_ext(serdes, PHY_MODE_ETHERNET,
+				       ocelot_port->phy_mode);
+		of_phy_put(serdes);
+		if (err) {
+			dev_err(dev, "Could not SerDes mode on port %d: %pe\n",
+				port, ERR_PTR(err));
+			return err;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ocelot_port_configure_serdes);
+
 void ocelot_phylink_mac_config(struct ocelot *ocelot, int port,
 			       unsigned int link_an_mode,
 			       const struct phylink_link_state *state)