net: dsa: Add new binding implementation

The existing DSA binding has a number of limitations and problems. The
main problem is that it cannot represent a switch as a linux device,
hanging off some bus. It is limited to one CPU port. The DSA platform
device is artificial, and does not really represent hardware.

Implement a new binding which can be embedded into any type of node on
a bus to represent one switch device, and its links to other switches.

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

1 files changed, 6 insertions, 2 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 35e5f0f6688b..15a492261895 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1099,14 +1099,18 @@ int dsa_slave_resume(struct net_device *slave_dev)
 }
 
 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
-                     int port, char *name)
+                     int port, const char *name)
 {
-        struct net_device *master = ds->dst->master_netdev;
         struct dsa_switch_tree *dst = ds->dst;
+        struct net_device *master;
         struct net_device *slave_dev;
         struct dsa_slave_priv *p;
         int ret;
 
+        master = ds->dst->master_netdev;
+        if (ds->master_netdev)
+                master = ds->master_netdev;
+
         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
                                  NET_NAME_UNKNOWN, ether_setup);
         if (slave_dev == NULL)