[PATCH net-next 2/7] net: dsa: add port parse functions

[Vivien Didelot]

Add symmetrical DSA port parsing functions for pdata and device tree,
used to parse and validate a given port node or platform data.

They don't do much for the moment but will be extended later on to
assign a port type and get device references.

Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
---
 net/dsa/dsa2.c | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 26d2ff013eb1..9b75d19d57cb 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -589,9 +589,17 @@ static int dsa_dst_parse(struct dsa_switch_tree *dst)
        return 0;
 }
 
+static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
+{
+       dp->dn = dn;
+
+       return 0;
+}
+
 static int dsa_parse_ports_of(struct device_node *dn, struct dsa_switch *ds)
 {
        struct device_node *ports, *port;
+       struct dsa_port *dp;
        u32 reg;
        int err;
 
@@ -609,22 +617,45 @@ static int dsa_parse_ports_of(struct device_node *dn, 
struct dsa_switch *ds)
                if (reg >= ds->num_ports)
                        return -EINVAL;
 
-               ds->ports[reg].dn = port;
+               dp = &ds->ports[reg];
+
+               err = dsa_port_parse_of(dp, port);
+               if (err)
+                       return err;
        }
 
        return 0;
 }
 
+static int dsa_port_parse(struct dsa_port *dp, const char *name,
+                         struct device *dev)
+{
+       dp->name = name;
+
+       return 0;
+}
+
 static int dsa_parse_ports(struct dsa_chip_data *cd, struct dsa_switch *ds)
 {
        bool valid_name_found = false;
+       struct dsa_port *dp;
+       struct device *dev;
+       const char *name;
        unsigned int i;
+       int err;
 
        for (i = 0; i < DSA_MAX_PORTS; i++) {
-               if (!cd->port_names[i])
+               name = cd->port_names[i];
+               dev = cd->netdev[i];
+               dp = &ds->ports[i];
+
+               if (!name)
                        continue;
 
-               ds->ports[i].name = cd->port_names[i];
+               err = dsa_port_parse(dp, name, dev);
+               if (err)
+                       return err;
+
                valid_name_found = true;
        }
 
-- 
2.14.3