soc: mscc: ocelot: add MII registers description

Add the register definitions for the MSCC MIIM MDIO controller in
preparation for seville_vsc9959.c to create its accessors for the
internal MDIO bus.

Since we've introduced elements to ocelot_regfields that are not
instantiated by felix and ocelot, we need to define the size of the
regfields arrays explicitly, otherwise ocelot_regfields_init, which
iterates up to REGFIELD_MAX, will fault on the undefined regfield
entries (if we're lucky).

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/soc/mscc/ocelot.h

@@ -409,6 +409,9 @@ enum ocelot_reg {
 	PTP_CLK_CFG_ADJ_CFG,
 	PTP_CLK_CFG_ADJ_FREQ,
 	GCB_SOFT_RST = GCB << TARGET_OFFSET,
+	GCB_MIIM_MII_STATUS,
+	GCB_MIIM_MII_CMD,
+	GCB_MIIM_MII_DATA,
 	DEV_CLOCK_CFG = DEV_GMII << TARGET_OFFSET,
 	DEV_PORT_MISC,
 	DEV_EVENTS,
@@ -496,6 +499,8 @@ enum ocelot_regfield {
 	SYS_RESET_CFG_MEM_ENA,
 	SYS_RESET_CFG_MEM_INIT,
 	GCB_SOFT_RST_SWC_RST,
+	GCB_MIIM_MII_STATUS_PENDING,
+	GCB_MIIM_MII_STATUS_BUSY,
 	REGFIELD_MAX
 };