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timer

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    Philipp Tomsich authored
    To make the Rockchip DM timer driver useful for the timing of
    bootstages, we need a few enhancements:
     - This implements timer_get_boot_us.
     - This avoids reinitialising the timer, if it has already been
       set up (e.g. by our TPL and SPL stages). Now, we have a single
       timebase ticking from TPL through the full U-Boot.
     - This adds support for reading the timer even before the
       device-model is ready: we find the timer via /chosen/tick-timer,
       then read its address and clock-frequency, and finally read the
       timeval directly).
    
    Signed-off-by: default avatarPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
    Reviewed-by: default avatarSimon Glass <sjg@chromium.org>
    Acked-by: default avatarPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
    cc7ce94e
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