net: dsa: sja1105: allow RX timestamps to be taken on all ports for SJA1110

On SJA1105, there is support for a cascade port which is presumably
connected to a downstream SJA1105 switch. The upstream one does not take
PTP timestamps for packets received on this port, presumably because the
downstream switch already did (and for PTP, it only makes sense for the
leaf nodes in a DSA switch tree to do that).

I haven't been able to validate that feature in a fully assembled setup,
so I am disabling the feature by setting the cascade port to an unused
port value (ds->num_ports).

In SJA1110, multiple cascade ports are supported, and CASC_PORT became
a bit mask from a port number. So when CASC_PORT is set to ds->num_ports
(which is 11 on SJA1110), it is actually set to 0b1011, so ports 3, 1
and 0 are configured as cascade ports and we cannot take RX timestamps
on them.

So we need to introduce a check for SJA1110 and set things differently
(to zero there), so that the cascading feature is properly disabled and
RX timestamps can be taken on all ports.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/dsa/sja1105/sja1105.h b/drivers/net/dsa/sja1105/sja1105.h
index f762f5488a76..4d192331754c 100644
--- a/drivers/net/dsa/sja1105/sja1105.h
+++ b/drivers/net/dsa/sja1105/sja1105.h
@@ -109,6 +109,7 @@ struct sja1105_info {
 	int num_cbs_shapers;
 	int max_frame_mem;
 	int num_ports;
+	bool multiple_cascade_ports;
 	const struct sja1105_dynamic_table_ops *dyn_ops;
 	const struct sja1105_table_ops *static_ops;
 	const struct sja1105_regs *regs;