net: dsa: sja1105: migrate to xpcs for SGMII
There is a desire to use the generic driver for the Synopsys XPCS located in drivers/net/pcs, and to achieve that, the sja1105 driver must expose an MDIO bus for the SGMII PCS, because the XPCS probes as an mdio_device. In preparation of the SJA1110 which in fact has a different access procedure for the SJA1105, we register this PCS MDIO bus once in the common code, but we implement function pointers for the read and write methods. In this patch there is a single implementation for them. There is exactly one MDIO bus for the PCS, this will contain all PCSes at MDIO addresses equal to the port number. We delete a bunch of hardware support code because the xpcs driver already does what we need. We need to hack up the MDIO reads for the PHY ID, since our XPCS instantiation returns zeroes and there are some specific fixups which need to be applied by the xpcs driver. Signed-off-by:Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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