This patch adds 6 wire mode supports which enables SGMII clock to MAC from phy. The drivers gets this 6 wire mode info by reading the property "ti,6-wire-mode" from DT. Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>