netdev - [PATCH v2 net-next 5/9] net: mscc: ocelot: expose serdes configuration function

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Date:   Fri, 17 Mar 2023 11:54:11 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     linux-phy@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Russell King <linux@...linux.org.uk>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, UNGLinuxDriver@...rochip.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Lee Jones <lee@...nel.org>
Subject: [PATCH v2 net-next 5/9] 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@...advantage.com>
---

v2
    * New patch

---
 drivers/net/ethernet/mscc/ocelot.c     | 40 ++++++++++++++++++++++++++
 drivers/net/ethernet/mscc/ocelot_net.c | 29 ++-----------------
 include/soc/mscc/ocelot.h              |  4 +++
 3 files changed, 47 insertions(+), 26 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)
diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
index 590a2b2816ad..21a87a3fc556 100644
--- a/drivers/net/ethernet/mscc/ocelot_net.c
+++ b/drivers/net/ethernet/mscc/ocelot_net.c
@@ -1742,34 +1742,11 @@ static int ocelot_port_phylink_create(struct ocelot *ocelot, int port,
 		return -EINVAL;
 	}
 
-	/* Ensure clock signals and speed are set on all QSGMII links */
-	if (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);
-
 	ocelot_port->phy_mode = phy_mode;
 
-	if (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, 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;
-		}
-	}
+	err = ocelot_port_configure_serdes(ocelot, port, portnp);
+	if (err)
+		return err;
 
 	priv = container_of(ocelot_port, struct ocelot_port_private, port);
 
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 87ade87d3540..d757b5e26d26 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -644,6 +644,7 @@ enum ocelot_tag_prefix {
 };
 
 struct ocelot;
+struct device_node;
 
 struct ocelot_ops {
 	struct net_device *(*port_to_netdev)(struct ocelot *ocelot, int port);
@@ -1111,6 +1112,9 @@ int ocelot_sb_occ_tc_port_bind_get(struct ocelot *ocelot, int port,
 				   enum devlink_sb_pool_type pool_type,
 				   u32 *p_cur, u32 *p_max);
 
+int ocelot_port_configure_serdes(struct ocelot *ocelot, int port,
+				 struct device_node *portnp);
+
 void ocelot_phylink_mac_config(struct ocelot *ocelot, int port,
 			       unsigned int link_an_mode,
 			       const struct phylink_link_state *state);
-- 
2.25.1