[PATCH net-next 2/3] of: mdio: Add a "broken-turn-around" property

[Florian Fainelli <f.fainelli@gmail.com>]

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 <f.fainelli@gmail.com>
---
 Documentation/devicetree/bindings/net/phy.txt | 3 +++
 drivers/of/of_mdio.c                          | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
index 40831fbaff72..525e1658f2da 100644
--- a/Documentation/devicetree/bindings/net/phy.txt
+++ b/Documentation/devicetree/bindings/net/phy.txt
@@ -30,6 +30,9 @@ Optional Properties:
 
 - max-speed: Maximum PHY supported speed (10, 100, 1000...)
 
+- broken-turn-around: If set, indicates the PHY device does not correctly
+  release the turn around line low at the end of a MDIO transaction.
+
 Example:
 
 ethernet-phy@0 {
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 0c064485d1c2..fdc60db60829 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -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);
-- 
2.1.0