net: Phy: Update phy interface modes from Linux ...

This syncs the phy interface modes with Linux and adds names
that were previously missing. With this we no longer have holes in
the phy mode name arrays and thus of_get_phy_mode no longer
derefences NULL pointers when it finds such a hole.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: of_net: use a loop ...

iterate over the different property names rather than having
the same code three times.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: phy: Add minimal support for QSGMII PHY ...

Based on Linux's support by Thomas Petazzoni:

    commit b9d1208
    Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
    Date:   Tue Apr 15 15:50:19 2014 +0200
    net: phy: add minimal support for QSGMII PHY

    This commit adds the necessary definitions for the PHY layer to
    recognize "qsgmii" as a valid PHY interface. A QSMII interface, as
    defined at
    http://en.wikipedia.org/wiki/Media_Independent_Interface#Quad_Serial_Gigabit_Media_Independent_Interface,
    is "is a method of combining four SGMII lines into a 5Gbit/s
    interface. QSGMII, like SGMII, uses LVDS signalling for the TX and RX
    data and a single LVDS clock signal. QSGMII uses significantly fewer
    signal lines than four SGMII busses."

    This type of MAC <-> PHY connection might require special handling on
    the MAC driver side, so it should be possible to express this type of
    MAC <-> PHY connection, for example in the Device Tree.

    Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
    Cc: devicetree@vger.kernel.org
    Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: net: respect phy-connection-type property ...

ePAPR defines phy-connection-type as standard property for PHY interface
between Ethernet device and PHY device. Add corresponding property check
to of_get_phy_mode.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

OF: base: sync of_find_property with linux OF API ...

To start synchronizing OF API of barebox with linux OF API, this adds
a length pointer to of_find_property. Also all current users of that
function are updated to reflect the API change.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

of/net: Add net related of helpers ...

of_get_phy_mode to parse the phy mode from the devicetree and
of_get_mac_address to parse a MAC address from the devicetree.
Directly taken from the Kernel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>