net: phy: Add phy_ignore_ta_mask to account for broken turn-around

Some PHY devices/switches will not release the turn-around line as they
should do at the end of a MDIO transaction. To help with such
situations, allow MDIO bus drivers to be made aware of such
restrictions.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/phy.h

@@ -181,6 +181,9 @@ struct mii_bus {
 	/* PHY addresses to be ignored when probing */
 	u32 phy_mask;
 
+	/* PHY addresses to ignore the TA/read failure */
+	u32 phy_ignore_ta_mask;
+
 	/*
 	 * Pointer to an array of interrupts, each PHY's
 	 * interrupt at the index matching its address