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Subject[PATCH net-next 1/2] net: dsa: bcm_sf2: Disallow port 5 to be a DSA CPU port
Date
While the switch driver is written such that port 5 or 8 could be CPU
ports, the use case on Broadcom STB chips is to use port 8 exclusively.
The platform firmware does make port 5 comply to a proper DSA CPU port
binding by specifiying an "ethernet" phandle. This is undesirable for
now until we have an user-space configuration mechanism (such as
devlink) which could support dynamically changing the port flavor at
run time.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/net/dsa/bcm_sf2.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 723820603107..2bd52b03de38 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -457,6 +457,7 @@ static void bcm_sf2_identify_ports(struct bcm_sf2_priv *priv,
{
struct device_node *port;
unsigned int port_num;
+ struct property *prop;
phy_interface_t mode;
int err;

@@ -483,6 +484,16 @@ static void bcm_sf2_identify_ports(struct bcm_sf2_priv *priv,

if (of_property_read_bool(port, "brcm,use-bcm-hdr"))
priv->brcm_tag_mask |= 1 << port_num;
+
+ /* Ensure that port 5 is not picked up as a DSA CPU port
+ * flavour but a regular port instead. We should be using
+ * devlink to be able to set the port flavour.
+ */
+ if (port_num == 5 && priv->type == BCM7278_DEVICE_ID) {
+ prop = of_find_property(port, "ethernet", NULL);
+ if (prop)
+ of_remove_property(port, prop);
+ }
}
}

--
2.25.1
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