Now that common PHY properties make it easy to configure the SerDes RX
and TX polarities, use that for the SGMII/1000Base-X/2500Base-X PCS of
the MaxLinear GSW1xx switches.

Also, validate hardware in probe() function to make sure the switch is
actually present and MDIO communication works properly.
---
Changes since initial submission:
 * use allOf to include phy-common-props in dt-schema
 * use phy_get_manual_rx_polarity and phy_get_manual_tx_polarity helpers
   instead of open-coding them

Daniel Golle (4):
  net: dsa: mxl-gsw1xx: setup polarities and validate chip
  dt-bindings: net: dsa: lantiq,gswip: reference common PHY properties
  net: dsa: mxl-gsw1xx: configure PCS polarities
  net: dsa: mxl-gsw1xx: validate chip ID

 .../bindings/net/dsa/lantiq,gswip.yaml        |  4 ++
 drivers/net/dsa/lantiq/Kconfig                |  1 +
 drivers/net/dsa/lantiq/mxl-gsw1xx.c           | 61 +++++++++++++++----
 drivers/net/dsa/lantiq/mxl-gsw1xx.h           |  9 +++
 4 files changed, 64 insertions(+), 11 deletions(-)

-- 
2.52.0