net: dsa: Allow configuration of CPU & DSA port speeds/duplex

By default, DSA and CPU ports are configured to the maximum speed the
switch supports. However there can be use cases where the peer devices
port is slower. Allow a fixed-link property to be used with the DSA
and CPU port in the device tree, and use this information to configure
the port.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 37 insertions, 0 deletions

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 053eb2b8e682..afff17341b73 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -176,6 +176,35 @@ __ATTRIBUTE_GROUPS(dsa_hwmon);
 #endif /* CONFIG_NET_DSA_HWMON */
 
 /* basic switch operations **************************************************/
+static int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct net_device *master)
+{
+        struct dsa_chip_data *cd = ds->pd;
+        struct device_node *port_dn;
+        struct phy_device *phydev;
+        int ret, port;
+
+        for (port = 0; port < DSA_MAX_PORTS; port++) {
+                if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
+                        continue;
+
+                port_dn = cd->port_dn[port];
+                if (of_phy_is_fixed_link(port_dn)) {
+                        ret = of_phy_register_fixed_link(port_dn);
+                        if (ret) {
+                                netdev_err(master,
+                                           "failed to register fixed PHY\n");
+                                return ret;
+                        }
+                        phydev = of_phy_find_device(port_dn);
+                        genphy_config_init(phydev);
+                        genphy_read_status(phydev);
+                        if (ds->drv->adjust_link)
+                                ds->drv->adjust_link(ds, port, phydev);
+                }
+        }
+        return 0;
+}
+
 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 {
         struct dsa_switch_driver *drv = ds->drv;
@@ -297,6 +326,14 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
                 }
         }
 
+        /* Perform configuration of the CPU and DSA ports */
+        ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
+        if (ret < 0) {
+                netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
+                           index);
+                ret = 0;
+        }
+
 #ifdef CONFIG_NET_DSA_HWMON
         /* If the switch provides a temperature sensor,
          * register with hardware monitoring subsystem.