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of: mdio: Add a "broken-turn-around" property

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Some Ethernet PHY devices/switches may not properly release the MDIO bus
during turn-around time, and fail to drive it low, which can be seen by
some controllers as a read failure, while the data clocked in is still
correct.

Add a boolean property "broken-turn-around" which is parsed by the
generic MDIO bus probing code and will set the corresponding bit in the
MDIO bus phy_ignore_ta_mask bitmask for MDIO bus drivers to utilize that
information.

Signed-off-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Florian Fainelli 2015-05-12 10:33:25 -07:00 • committed by David S. Miller
commit ab6016e0c1
2 changed files with 6 additions and 0 deletions
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3
drivers/of/of_mdio.c
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@ -68,6 +68,9 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *chi
phy->irq = mdio->irq[addr];
}
if (of_property_read_bool(child, "broken-turn-around"))
mdio->phy_ignore_ta_mask |= 1 << addr;
/* Associate the OF node with the device structure so it
* can be looked up later */
of_node_get(child);