• Thomas Petazzoni's avatar
    of: provide a binding for fixed link PHYs · 3be2a49e
    Thomas Petazzoni authored
    Some Ethernet MACs have a "fixed link", and are not connected to a
    normal MDIO-managed PHY device. For those situations, a Device Tree
    binding allows to describe a "fixed link" using a special PHY node.
    
    This patch adds:
    
     * A documentation for the fixed PHY Device Tree binding.
    
     * An of_phy_is_fixed_link() function that an Ethernet driver can call
       on its PHY phandle to find out whether it's a fixed link PHY or
       not. It should typically be used to know if
       of_phy_register_fixed_link() should be called.
    
     * An of_phy_register_fixed_link() function that instantiates the
       fixed PHY into the PHY subsystem, so that when the driver calls
       of_phy_connect(), the PHY device associated to the OF node will be
       found.
    
    These two additional functions also support the old fixed-link Device
    Tree binding used on PowerPC platforms, so that ultimately, the
    network device drivers for those platforms could be converted to use
    of_phy_is_fixed_link() and of_phy_register_fixed_link() instead of
    of_phy_connect_fixed_link(), while keeping compatibility with their
    respective Device Tree bindings.
    Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
    Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
    Tested-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    3be2a49e
fixed-link.txt 855 Bytes