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authorAndrew Lunn <andrew@lunn.ch>2015-08-08 15:09:14 (GMT)
committerDavid S. Miller <davem@davemloft.net>2015-08-10 21:25:02 (GMT)
commit6bc6d0a88179b732b9a5e40e05099dc219d1b3cb (patch)
tree06ca8d36ecf28a6319ce7bd9f1f6f57b14929c9f /net/dsa
parent966bce38e7fdb75eedaec90e40e4d22b9fbce79f (diff)
dsa: Support multiple MDIO busses
When using a cluster of switches, some topologies will have an MDIO bus per switch, not one for the whole cluster. Allow this to be represented in the device tree, by adding an optional mii-bus property at the switch level. The old platform_device method of instantiation supports this already, so only the device tree binding needs extending with an additional optional phandle. 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>
Diffstat (limited to 'net/dsa')
-rw-r--r--net/dsa/dsa.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index b445d49..78d4ac9 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -574,7 +574,7 @@ static int dsa_of_probe(struct device *dev)
{
struct device_node *np = dev->of_node;
struct device_node *child, *mdio, *ethernet, *port, *link;
- struct mii_bus *mdio_bus;
+ struct mii_bus *mdio_bus, *mdio_bus_switch;
struct net_device *ethernet_dev;
struct dsa_platform_data *pd;
struct dsa_chip_data *cd;
@@ -636,6 +636,16 @@ static int dsa_of_probe(struct device *dev)
if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
cd->eeprom_len = eeprom_len;
+ mdio = of_parse_phandle(child, "mii-bus", 0);
+ if (mdio) {
+ mdio_bus_switch = of_mdio_find_bus(mdio);
+ if (!mdio_bus_switch) {
+ ret = -EPROBE_DEFER;
+ goto out_free_chip;
+ }
+ cd->host_dev = &mdio_bus_switch->dev;
+ }
+
for_each_available_child_of_node(child, port) {
port_reg = of_get_property(port, "reg", NULL);
if (!port_reg)

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