of: mdio: Add a "broken-turn-around" property (ab6016e0) · Commits · 戴 / test

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> Signed-off-by:

David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/phy.txt

+3 −0

Original line number	Diff line number	Diff line
		@@ -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 {

drivers/of/of_mdio.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);

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