net: mscc: ocelot: make use of SerDes PHYs for handling their configuration

Previously, the SerDes muxing was hardcoded to a given mode in the MAC
controller driver. Now, the SerDes muxing is configured within the
Device Tree and is enforced in the MAC controller driver so we can have
a lot of different SerDes configurations.

Make use of the SerDes PHYs in the MAC controller to set up the SerDes
according to the SerDes<->switch port mapping and the communication mode
with the Ethernet PHY.

Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 10 deletions

diff --git a/drivers/net/ethernet/mscc/ocelot_board.c b/drivers/net/ethernet/mscc/ocelot_board.c
index dca205e0ef75..953b32677383 100644
--- a/drivers/net/ethernet/mscc/ocelot_board.c
+++ b/drivers/net/ethernet/mscc/ocelot_board.c
@@ -6,6 +6,7 @@
  */
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/of_net.h>
 #include <linux/netdevice.h>
 #include <linux/of_mdio.h>
 #include <linux/of_platform.h>
@@ -253,18 +254,12 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 	INIT_LIST_HEAD(&ocelot->multicast);
 	ocelot_init(ocelot);
 
-	ocelot_rmw(ocelot, HSIO_HW_CFG_DEV1G_4_MODE |
-		     HSIO_HW_CFG_DEV1G_6_MODE |
-		     HSIO_HW_CFG_DEV1G_9_MODE,
-		     HSIO_HW_CFG_DEV1G_4_MODE |
-		     HSIO_HW_CFG_DEV1G_6_MODE |
-		     HSIO_HW_CFG_DEV1G_9_MODE,
-		     HSIO_HW_CFG);
-
 	for_each_available_child_of_node(ports, portnp) {
 		struct device_node *phy_node;
 		struct phy_device *phy;
 		struct resource *res;
+		struct phy *serdes;
+		enum phy_mode phy_mode;
 		void __iomem *regs;
 		char res_name[8];
 		u32 port;
@@ -289,10 +284,45 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 			continue;
 
 		err = ocelot_probe_port(ocelot, port, regs, phy);
-		if (err) {
-			dev_err(&pdev->dev, "failed to probe ports\n");
+		if (err)
+			return err;
+
+		err = of_get_phy_mode(portnp);
+		if (err < 0)
+			ocelot->ports[port]->phy_mode = PHY_INTERFACE_MODE_NA;
+		else
+			ocelot->ports[port]->phy_mode = err;
+
+		switch (ocelot->ports[port]->phy_mode) {
+		case PHY_INTERFACE_MODE_NA:
+			continue;
+		case PHY_INTERFACE_MODE_SGMII:
+			phy_mode = PHY_MODE_SGMII;
+			break;
+		case PHY_INTERFACE_MODE_QSGMII:
+			phy_mode = PHY_MODE_QSGMII;
+			break;
+		default:
+			dev_err(ocelot->dev,
+				"invalid phy mode for port%d, (Q)SGMII only\n",
+				port);
+			return -EINVAL;
+		}
+
+		serdes = devm_of_phy_get(ocelot->dev, portnp, NULL);
+		if (IS_ERR(serdes)) {
+			err = PTR_ERR(serdes);
+			if (err == -EPROBE_DEFER)
+				dev_dbg(ocelot->dev, "deferring probe\n");
+			else
+				dev_err(ocelot->dev,
+					"missing SerDes phys for port%d\n",
+					port);
+
 			goto err_probe_ports;
 		}
+
+		ocelot->ports[port]->serdes = serdes;
 	}
 
 	register_netdevice_notifier(&ocelot_netdevice_nb);