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net: dsa: bcm_sf2: Disallow port 5 to be a DSA CPU port 

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2020-09-22 13:03:55 -07:00 committed by David S. Miller
parent 9d33ffaaf3
commit 8c28044097
1 changed files with 11 additions and 0 deletions
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11
drivers/net/dsa/bcm_sf2.c
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@ -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);
}
}
}