• Benjamin Herrenschmidt's avatar
    fsi: Add new central chardev support · 0ab5fe53
    Benjamin Herrenschmidt authored
    The various FSI devices (sbefifo, occ, scom, more to come)
    currently use misc devices.
    
    This is problematic as the minor device space for misc is
    limited and there can be a lot of them. Also it limits our
    ability to move them to a dedicated /dev/fsi directory or
    to be smart about device naming and numbering.
    
    It also means we have IDAs on every single of these drivers
    
    This creates a common fsi "device_type" for the optional
    /dev/fsi grouping and a dev_t allocator for all FSI devices.
    
    "Legacy" devices get to use a backward compatible numbering
    scheme (as long as chip id <16 and there's only one copy
    of a given unit type per chip).
    
    A single major number and a single IDA are shared for all
    FSI devices.
    
    This doesn't convert the FSI device drivers to use the new
    scheme yet, they will be converted individually.
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    0ab5fe53
fsi.h 2.65 KB