Loading
Merge branch 'sja1105-phylink-updates'
Russell King says:
====================
net: dsa: sja1105: phylink updates
This series updates the phylink implementation in sja1105 to use the
supported_interfaces bitmap, convert to the mac_select_pcs() interface,
mark as non-legacy, and get rid of the validation method.
As a final step, enable switching between SGMII and 2500BASE-X as it
is a feature that Vladimir desires.
Specifically, the patches in this series:
1. Populates the supported_interfaces bitmap.
2. As a result of the supported_interfaces bitmap being populated,
sja1105 no longer needs to check the interface mode as phylink
will do this.
3. Switch away from using phylink_set_pcs(), using the mac_select_pcs()
method instead.
4. Mark the driver as not-legacy
5. Fill in mac_capabilities using _exactly_ the same conditions as is
currently used to decide which link modes to support, and convert
to use phylink_generic_validate()
6. Add brand new support to permit switching between SGMII and
2500BASE-X modes of operation as per Vladimir's single patch that
performs steps 1, 2, 5 and 6 in one go.
There are some additional changes in Vladimir's single patch that I
have not included:
* validation of priv->phy_mode[] in sja1105_phylink_get_caps(). The
driver has already validated the phy_mode for each port in
sja1105_init_mii_settings(), and a failure here will prevent the
driver reaching sja1105_phylink_get_caps().
* Changing the decisions on which mac_capabilities to set. Vladimir's
patch always sets MAC_10FD | MAC_100FD | MAC_1000FD despite the
current code clearly making the 1G speed conditional on the
xmii_mode for the port. The change in decision making may be
visible when in PHY_INTERFACE_MODE_INTERNAL mode, for which
the phylink_generic_validate() will pass through all the MAC
capabilities as ethtool link modes.
Hence, if we have PHY_INTERFACE_MODE_INTERNAL but supports_rgmii[]
or supports_sgmii[] is non-zero, currently we do not get 1G speeds.
With Vladimir's additional change, we will get 1G speeds.
While it is not clear whether that can happen, I feel changing the
decision making should be a separate patch.
* The decision for MAC_2500FD is made differently -
sja1105_init_mii_settings() allows PHY_INTERFACE_MODE_2500BASEX
when supports_2500basex[] is non-zero, and is not based on any other
condition such as supports_sgmii[] or supports_rgmii[]. Vladimir's
patch makes it additionally conditional on those supports_.gmii[]
settings, which is a functional change that should be made in a
separate patch - and if desired, then sja1105_init_mii_settings()
should also be updated at the same time.
Consequently, I believe that my previous objections to Vladimir's
single patch approach are well founded and justified, even through
Vladimir is the maintainer of this driver. I have no objection to
the additional changes, I just don't think they should all be wrapped
up into a single patch that converts the way validation is done _and_
also makes a bunch of other functional changes.
RFC->non-RFC: added Vladimir's Reviewed-by's, fixed the typo in the
commit message of patch 6, and removed the phrase at the end of a
comment as requested.
====================
Signed-off-by: 
David S. Miller <davem@davemloft.net>