Due to the complexity it can be hard to know why DSA fails to probe.
Add some debug prints for the common error cases.
Signed-off-by: Andrew Lunn <and...@lunn.ch>
---
net/dsa/dsa.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 0658077f4e63..2c1f50561343 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -672,6 +672,7 @@ static int dsa_of_probe(struct device *dev, struct
dsa_platform_data *pd)
ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
if (!ethernet) {
+ dev_dbg(dev, "Missing mandatory dsa,ethernet property\n");
ret = -EINVAL;
goto out_put_mdio;
}
@@ -703,8 +704,10 @@ static int dsa_of_probe(struct device *dev, struct
dsa_platform_data *pd)
if (chip) {
cd->of_chip = chip;
} else {
- if (!mdio)
+ if (!mdio) {
+ dev_dbg(dev, "Missing required dsa,mii-bus
property\n");
return -EINVAL;
+ }
mdio_bus = of_mdio_find_bus(mdio);
if (!mdio_bus)
@@ -1002,13 +1005,17 @@ int dsa_switch_register(struct dsa_switch_tree *dst,
struct dsa_switch *ds,
struct dsa_platform_data *pd = dst->pd;
int index = dsa_find_chip_index(dst, np);
- if (index < 0)
+ if (index < 0) {
+ netdev_dbg(dst->master_netdev, "Registration for unknown
switch\n");
return index;
+ }
netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n", index,
name);
- if (dst->ds[index])
+ if (dst->ds[index]) {
+ netdev_dbg(dst->master_netdev, "Device already registered\n");
return -EINVAL;
+ }
ds->index = index;
ds->pd = &pd->chip[index];
--
2.6.3
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