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net: dsa: Allow multi hop routes to be expressed

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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>
This commit is contained in:
Andrew Lunn 2015-08-17 23:52:50 +02:00 committed by David S. Miller
parent 61ed713bbb
commit 1e72e6f885
2 changed files with 57 additions and 16 deletions
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33
Documentation/devicetree/bindings/net/dsa/dsa.txt
View File

@ -44,9 +44,10 @@ Note that a port labelled "dsa" will imply checking for the uplink phandle
described below.
Optionnal property:
- link : Should be a phandle to another switch's DSA port.
- link : Should be a list of phandles to another switch's DSA port.
This property is only used when switches are being
chained/cascaded together.
chained/cascaded together. This port is used as outgoing port
towards the phandle port, which can be more than one hop away.
- phy-handle : Phandle to a PHY on an external MDIO bus, not the
switch internal one. See
@ -100,10 +101,11 @@ Example:
label = "cpu";
};
switch0uplink: port@6 {
switch0port6: port@6 {
reg = <6>;
label = "dsa";
link = <&switch1uplink>;
link = <&switch1port0
&switch2port0>;
};
};
@ -113,10 +115,29 @@ Example:
reg = <17 1>; /* MDIO address 17, switch 1 in tree */
mii-bus = <&mii_bus1>;
switch1uplink: port@0 {
switch1port0: port@0 {
reg = <0>;
label = "dsa";
link = <&switch0uplink>;
link = <&switch0port6>;
};
switch1port1: port@1 {
reg = <1>;
label = "dsa";
link = <&switch2port1>;
};
};
switch@2 {
#address-cells = <1>;
#size-cells = <0>;
reg = <18 2>; /* MDIO address 18, switch 2 in tree */
mii-bus = <&mii_bus1>;
switch2port0: port@0 {
reg = <0>;
label = "dsa";
link = <&switch1port1
&switch0port6>;
};
};
};

40
net/dsa/dsa.c
View File

@ -554,6 +554,31 @@ static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
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 void dsa_of_free_platform_data(struct dsa_platform_data *pd)
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 @@ static int dsa_of_probe(struct device *dev)
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;
}
}