• Dipen Patel's avatar
    drivers: Add hardware timestamp engine (HTE) subsystem · 31ab09b4
    Dipen Patel authored
    Some devices can timestamp system lines/signals/Buses in real-time
    using the hardware counter or other hardware means which can give
    finer granularity and help avoid jitter introduced by software
    timestamping. To utilize such functionality, this patchset creates
    HTE subsystem where devices can register themselves as providers so
    that the consumers devices can request specific line from the
    providers. The patch also adds compilation support in Makefile and
    menu options in Kconfig.
    
    The provider does following:
    - Registers chip with the framework.
    - Provides translation hook to convert logical line id.
    - Provides enable/disable, request/release callbacks.
    - Pushes timestamp data to HTE subsystem.
    
    The consumer does following:
    - Initializes line attribute.
    - Gets HTE timestamp descriptor.
    - Requests timestamp functionality.
    - Puts HTE timestamp descriptor.
    Signed-off-by: default avatarDipen Patel <dipenp@nvidia.com>
    Reported-by: default avatarkernel test robot <lkp@intel.com>
    Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
    31ab09b4
hte.c 21.4 KB