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-rw-r--r--Documentation/devicetree/bindings/net/dsa/dsa.txt4
-rw-r--r--net/dsa/dsa.c23
2 files changed, 10 insertions, 17 deletions
diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.txt b/Documentation/devicetree/bindings/net/dsa/dsa.txt
index e124847443f8..f0b4cd72411d 100644
--- a/Documentation/devicetree/bindings/net/dsa/dsa.txt
+++ b/Documentation/devicetree/bindings/net/dsa/dsa.txt
@@ -19,7 +19,9 @@ the parent DSA node. The maximum number of allowed child nodes is 4
(DSA_MAX_SWITCHES).
Each of these switch child nodes should have the following required properties:
-- reg : Describes the switch address on the MII bus
+- reg : Contains two fields. The first one describes the
+ address on the MII bus. The second is the switch
+ number that must be unique in cascaded configurations
- #address-cells : Must be 1
- #size-cells : Must be 0
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 2173402d87e0..4dea2e0681d1 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -501,12 +501,10 @@ static struct net_device *dev_to_net_device(struct device *dev)
#ifdef CONFIG_OF
static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
struct dsa_chip_data *cd,
- int chip_index,
+ int chip_index, int port_index,
struct device_node *link)
{
- int ret;
const __be32 *reg;
- int link_port_addr;
int link_sw_addr;
struct device_node *parent_sw;
int len;
@@ -519,6 +517,10 @@ static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
if (!reg || (len != sizeof(*reg) * 2))
return -EINVAL;
+ /*
+ * Get the destination switch number from the second field of its 'reg'
+ * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
+ */
link_sw_addr = be32_to_cpup(reg + 1);
if (link_sw_addr >= pd->nr_chips)
@@ -535,20 +537,9 @@ static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
}
- reg = of_get_property(link, "reg", NULL);
- if (!reg) {
- ret = -EINVAL;
- goto out;
- }
-
- link_port_addr = be32_to_cpup(reg);
-
- cd->rtable[link_sw_addr] = link_port_addr;
+ cd->rtable[link_sw_addr] = port_index;
return 0;
-out:
- kfree(cd->rtable);
- return ret;
}
static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
@@ -658,7 +649,7 @@ static int dsa_of_probe(struct platform_device *pdev)
if (!strcmp(port_name, "dsa") && link &&
pd->nr_chips > 1) {
ret = dsa_of_setup_routing_table(pd, cd,
- chip_index, link);
+ chip_index, port_index, link);
if (ret)
goto out_free_chip;
}