net: dsa: Allow multi hop routes to be expressed
With more than two switches in a hierarchy, it becomes necessary to
describe multi-hop routes between switches. The current binding does
not allow this, although the older platform_data did. Extend the link
property to be a list rather than a single phandle to a remote switch.
It is then possible to express that a port should be used to reach
more than one switch and the switch maybe more than one hop away.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 78d4ac9..053eb2b 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -554,6 +554,31 @@
return 0;
}
+static int dsa_of_probe_links(struct dsa_platform_data *pd,
+ struct dsa_chip_data *cd,
+ int chip_index, int port_index,
+ struct device_node *port,
+ const char *port_name)
+{
+ struct device_node *link;
+ int link_index;
+ int ret;
+
+ for (link_index = 0;; link_index++) {
+ link = of_parse_phandle(port, "link", link_index);
+ if (!link)
+ break;
+
+ if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
+ ret = dsa_of_setup_routing_table(pd, cd, chip_index,
+ port_index, link);
+ if (ret)
+ return ret;
+ }
+ }
+ return 0;
+}
+
static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
{
int i;
@@ -573,7 +598,7 @@
static int dsa_of_probe(struct device *dev)
{
struct device_node *np = dev->of_node;
- struct device_node *child, *mdio, *ethernet, *port, *link;
+ struct device_node *child, *mdio, *ethernet, *port;
struct mii_bus *mdio_bus, *mdio_bus_switch;
struct net_device *ethernet_dev;
struct dsa_platform_data *pd;
@@ -668,15 +693,10 @@
goto out_free_chip;
}
- link = of_parse_phandle(port, "link", 0);
-
- if (!strcmp(port_name, "dsa") && link &&
- pd->nr_chips > 1) {
- ret = dsa_of_setup_routing_table(pd, cd,
- chip_index, port_index, link);
- if (ret)
- goto out_free_chip;
- }
+ ret = dsa_of_probe_links(pd, cd, chip_index,
+ port_index, port, port_name);
+ if (ret)
+ goto out_free_chip;
}
}