Commit a77f4f70 authored Apr 28, 2016 by Florian Fainelli Committed by David S. Miller May 01, 2016

of: of_mdio: Check if MDIO bus controller is available



Add a check whether the 'struct device_node' pointer passed to
of_mdiobus_register() is an available (aka enabled) node in the Device
Tree.

Rationale for doing this are cases where an Ethernet MAC provides a MDIO
bus controller and node, and an additional Ethernet MAC might be
connecting its PHY/switches to that first MDIO bus controller, while
still embedding one internally which is therefore marked as "disabled".

Instead of sprinkling checks like these in callers of
of_mdiobus_register(), do this in a central location.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 3cfef195

drivers/of/of_mdio.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -209,6 +209,10 @@ int of_mdiobus_register(struct mii_bus mdio, struct device_node np)
		bool scanphys = false;
		int addr, rc;

		/* Do not continue if the node is disabled */
		if (!of_device_is_available(np))
		return -ENODEV;

		/* Mask out all PHYs from auto probing. Instead the PHYs listed in
		* the device tree are populated after the bus has been registered */
		mdio->phy_mask = ~0;