• Roger Quadros's avatar
    mdio_bus: Issue GPIO RESET to PHYs. · 69226896
    Roger Quadros authored
    
    
    Some boards [1] leave the PHYs at an invalid state
    during system power-up or reset thus causing unreliability
    issues with the PHY which manifests as PHY not being detected
    or link not functional. To fix this, these PHYs need to be RESET
    via a GPIO connected to the PHY's RESET pin.
    
    Some boards have a single GPIO controlling the PHY RESET pin of all
    PHYs on the bus whereas some others have separate GPIOs controlling
    individual PHY RESETs.
    
    In both cases, the RESET de-assertion cannot be done in the PHY driver
    as the PHY will not probe till its reset is de-asserted.
    So do the RESET de-assertion in the MDIO bus driver.
    
    [1] - am572x-idk, am571x-idk, a437x-idk
    Signed-off-by: default avatarRoger Quadros <rogerq@ti.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    69226896
of_mdio.c 13.6 KB