• Alvin Šipraga's avatar
    net: dsa: realtek-smi: add rtl8365mb subdriver for RTL8365MB-VC · 4af2950c
    Alvin Šipraga authored
    This patch adds a realtek-smi subdriver for the RTL8365MB-VC 4+1 port
    10/100/1000M switch controller. The driver has been developed based on a
    GPL-licensed OS-agnostic Realtek vendor driver known as rtl8367c found
    in the OpenWrt source tree.
    
    Despite the name, the RTL8365MB-VC has an entirely different register
    layout to the already-supported RTL8366RB ASIC. Notwithstanding this,
    the structure of the rtl8365mb subdriver is loosely based on the rtl8366rb
    subdriver. Like the 'rb, it establishes its own irqchip to handle
    cascaded PHY link status interrupts.
    
    The RTL8365MB-VC switch is capable of offloading a large number of
    features from the software, but this patch introduces only the most
    basic DSA driver functionality. The ports always function as standalone
    ports, with bridging handled in software.
    
    One more thing. Realtek's nomenclature for switches makes it hard to
    know exactly what other ASICs might be supported by this driver. The
    vendor driver goes by the name rtl8367c, but as far as I can tell, no
    chip actually exists under this name. As such, the subdriver is named
    rtl8365mb to emphasize the potentially limited support. But it is clear
    from the vendor sources that a number of other more advanced switches
    share a similar register layout, and further support should not be too
    hard to add given access to the relevant hardware. With this in mind,
    the subdriver has been written with as few assumptions about the
    particular chip as is reasonable. But the RTL8365MB-VC is the only
    hardware I have available, so some further work is surely needed.
    Co-developed-by: default avatarMichael Rasmussen <mir@bang-olufsen.dk>
    Signed-off-by: default avatarMichael Rasmussen <mir@bang-olufsen.dk>
    Signed-off-by: default avatarAlvin Šipraga <alsi@bang-olufsen.dk>
    Reviewed-by: default avatarVladimir Oltean <olteanv@gmail.com>
    Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
    Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
    Tested-by: default avatarArınç ÜNAL <arinc.unal@arinc9.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    4af2950c
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