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>
Documentation/devicetree/bindings/net/ethernet.txt
for details.
Documentation/devicetree/bindings/net/ethernet.txt
for details.
+- mii-bus : Should be a phandle to a valid MDIO bus device node.
+ This mii-bus will be used in preference to the
+ global dsa,mii-bus defined above, for this switch.
+
Optional subnodes:
- fixed-link : Fixed-link subnode describing a link to a non-MDIO
managed entity. See
Optional subnodes:
- fixed-link : Fixed-link subnode describing a link to a non-MDIO
managed entity. See
#address-cells = <1>;
#size-cells = <0>;
reg = <17 1>; /* MDIO address 17, switch 1 in tree */
#address-cells = <1>;
#size-cells = <0>;
reg = <17 1>; /* MDIO address 17, switch 1 in tree */
switch1uplink: port@0 {
reg = <0>;
switch1uplink: port@0 {
reg = <0>;
{
struct device_node *np = dev->of_node;
struct device_node *child, *mdio, *ethernet, *port, *link;
{
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;
struct net_device *ethernet_dev;
struct dsa_platform_data *pd;
struct dsa_chip_data *cd;
if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
cd->eeprom_len = eeprom_len;
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)
for_each_available_child_of_node(child, port) {
port_reg = of_get_property(port, "reg", NULL);
if (!port_reg)