net: dsa: Plug in PHYLINK support
authorFlorian Fainelli <f.fainelli@gmail.com>
Thu, 10 May 2018 20:17:36 +0000 (13:17 -0700)
committerDavid S. Miller <davem@davemloft.net>
Fri, 11 May 2018 16:03:06 +0000 (12:03 -0400)
commitaab9c4067d2389d0adfc9c53806437df7b0fe3d5
tree1f7054492dfaf59cccb1ce258ec40898057e062f
parentc9a2356f35409a667429254bc326b10f92c7ecce
net: dsa: Plug in PHYLINK support

Add support for PHYLINK within the DSA subsystem in order to support more
complex devices such as pluggable (SFP) and non-pluggable (SFF) modules, 10G
PHYs, and traditional PHYs. Using PHYLINK allows us to drop some amount of
complexity we had while probing fixed and non-fixed PHYs using Device Tree.

Because PHYLINK separates the Ethernet MAC/port configuration into different
stages, we let switch drivers implement those, and for now, we maintain
functionality by calling dsa_slave_adjust_link() during
phylink_mac_link_{up,down} which provides semantically equivalent steps.

Drivers willing to take advantage of PHYLINK should implement the phylink_mac_*
operations that DSA wraps.

We cannot quite remove the adjust_link() callback just yet, because a number of
drivers rely on that for configuring their "CPU" and "DSA" ports, this is done
dsa_port_setup_phy_of() and dsa_port_fixed_link_register_of() still.

Drivers that utilize fixed links for user-facing ports (e.g: bcm_sf2) will need
to implement phylink_mac_ops from now on to preserve functionality, since PHYLINK
*does not* create a phy_device instance for fixed links.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/dsa.h
net/dsa/dsa_priv.h
net/dsa/slave.c